Chemical engineering education

Material Information

Chemical engineering education
Alternate Title:
Abbreviated Title:
Chem. eng. educ.
American Society for Engineering Education -- Chemical Engineering Division
Place of Publication:
Storrs, Conn
Chemical Engineering Division, American Society for Engineering Education
Publication Date:
Annual[ FORMER 1960-1961]
Physical Description:
v. : ill. ; 22-28 cm.


Subjects / Keywords:
Chemical engineering -- Study and teaching -- Periodicals ( lcsh )
periodical ( marcgt )
serial ( sobekcm )


Chemical abstracts
Additional Physical Form:
Also issued online.
Dates or Sequential Designation:
1960-June 1964 ; v. 1, no. 1 (Oct. 1965)-
Numbering Peculiarities:
Publication suspended briefly: issue designated v. 1, no. 4 (June 1966) published Nov. 1967.
General Note:
Title from cover.
General Note:
Place of publication varies: Rochester, N.Y., 1965-1967; Gainesville, Fla., 1968-

Record Information

Source Institution:
University of Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
01151209 ( OCLC )
70013732 ( LCCN )
0009-2479 ( ISSN )
TP165 .C18 ( lcc )
660/.2/071 ( ddc )

UFDC Membership

Chemical Engineering Documents


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Department of Chemical Engineering
University of Florida
Gainesville, Florida 32611
Editor: Ray Fahien
Associate Editor: Mack Tyner
Editorial & Business Assistant:
Carole C. Yocum (904) 392-0861
Publications Board and Regional
Advertising Representatives:
Klaus D. Timmerhaus
University of Colorado
Vice Chairman:
Lee C. Eagleton
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Homer F. Johnson
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CENTRAL: Leslie E. Lahti
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Camden A. Coberly
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WEST: R. W. Tock
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California Institute of Technology
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University of Colorado
C. Judson King
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NORTH: J. J. Martin
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Edward B. Stuart
University of Pittsburgh
NORTHEAST: Angelo J. Perna
New Jersey Institute of Technology
NORTHWEST: Charles Sleicher
University of Washington
Charles E. Wicks
Oregon State University
Thomas W. Weber
State University of New York
D. R. Coughanowr
Drexel University
Stuart W. Churchill
University of Pennsylvania
James H. Hand
University of Michigan

Chemical Engineering Education

2 Departments of Chemical Engineering
Georgia Tech, Gary Poehlein

8 The Educator
Art Humphrey and Biochemical
Engineering at the University of
Pennsylvania, Alan E. Myers

IS Classroom
A Full-Year Course Sequence in Real-
Time Computing, D. A. Mellichamp
32 The Integration of Real-Time Computing
Into Process Control Teaching: Part II,
The Undergraduate Course,
M. Morari, W. H. Ray

26 Laboratory
Advanced Process Control Experiments,
Pradeep B. Deshpande, W. L. S. Laukhuf,
Nandkishor G. Patke
38 Process Control Experiment: The Toilet
Tank, Thomas J. Ward
42 Curriculum
A Survey of Process Control Education in
the U.S. and Canada, Dale E. Seborg

Class and Home Problems
45 Solution: The Mirror Fog Problem,
R. L. Kabel
46 In the "Heat" of The Night, R. L. Gordon
47 Two-Dimensional Heat Transport, A. Basio
14 Lecture
The Rate of Reaction: A Definition or the
Result of a Conservation Equation?
Alberto Cassano

12, 24 Book Reviews
44 ChE News

CHEMICAL ENGINEERING EDUCATION is published quarterly by the Chemical
Engineering Division, American Society for Engineering Education. The publication
is edited at the Chemical Engineering Department, University of Florida. Second-class
postage is paid at Gainesville, Florida, and at DeLeon Springs, Florida. Correspondence
regarding editorial matter, circulation and changes of address should be addressed
to the Editor at Gainesville, Florida 32611. Advertising rates and information are
available from the advertising representatives. Plates and other advertising material
may be sent directly to the printer: E. O. Painter Printing Co., P. 0. Box 87,.
DeLeon Springs, Florida 32028. Subscription rate U.S., Canada, and Mexico is $15 per
year, $10 per year mailed to members of AIChE and of the ChE Division of ASEE.
Bulk subscription rates to ChE faculty on request Write for prices on individual
back copies. Copyright 1980 Chemical Engineering Division of American Society
for Engineering Education. The statements and opinions expressed in this periodical
are those of the writers and not necessarily those of the ChE Division of the ASEE
which body assumes no responsibility for them. Defective copies replaced if notified
within 120 days.
The International Organization for Standardization has assigned the code US ISSN
0009-2479 for the identification of this periodical.


Atlanta's skyline is shown behind the Tower of Tech's Administration Building.



4 Pe"od oj T'ia*ditei

Georgia Institute of Technology
Atlanta, GA 30332

LAST WINTER WHILE browsing in the campus
bookstore I found a stack of T-shirts imprinted
with the message "MIT-THE GEORGIA TECH
OF THE NORTH." I returned two days later to
purchase one for my friend Professor James Wei
(MIT Department Head and a Georgia Tech
graduate) only to find they had all been sold. In
their place were T-shirts which bore the message
Avenue is the southern boundary of the campus).
I decided not to buy one of the replacement shirts.
It probably would not have been received with

Copyright ChE Division, ASEE, 1980

much enthusiasm by Professor Wei.
Both T-shirt messages contained elements of
truth and fiction. Georgia Tech, like MIT, has a
long-standing reputation for quality engineering
and scientific education. Unlike MIT, Georgia Tech
is a State Institution, being part of the University
System of Georgia. Four colleges (Engineering,
Architecture, Sciences and Liberal Studies, and
Industrial Management) offer undergraduate and
graduate degrees in areas that could be described,
in a broad sense, by the term "Technology." De-
grees are not offered in areas such as music,
English, art, history, etc. This last fact is re-
sponsible for the "trade school" label on the second
stack of T-shirts. Of course, those of us associated
with Tech know that this label does not reflect


reality. Our liberal studies departments are staffed
with high-quality faculty who offer a very wide
range of courses to help our students obtain a
broad education.
The Georgia Tech campus is located on 280
acres about 11/2 miles from the center of Atlanta.
With a population of about 1,750,000, Atlanta is
the center of commerce in the rapidly growing
Southeast. It is a dynamic, beautiful and exciting
city with a very diverse population. Atlanta is an
educational center with 29 degree-granting
colleges, junior colleges, and universities; a center
for the arts with a symphony orchestra, a ballet
company, numerous art exhibits, local and im-
ported theater groups, a wide variety of special
festivals; and a center for sports, with teams in
all major professional leagues.
The School of Chemical Engineering at Georgia
Tech is comprised of a Chemical Engineering Di-
vision, a Metallurgy Division, and the Fracture
and Fatigue Research Laboratory, an interdis-
ciplinary research organization. Faculty and other
scientific staff are listed in Table 1. The Chemical
Engineering Division offers B.S., M.S. and Ph.D.
degrees. The Metallurgy Division does not offer
a designated undergraduate degree but does have
a very active graduate program leading to M.S.
and Ph.D. degrees.
The School of Chemical Engineering has been
changing rapidly during the past few years. Dr.
Waldemar Ziegler retired at the end of the 1977-
78 academic year, several faculty have left for
other positions and, unfortunately, Dr. Leon
Bridger and Dr. Homer Grubb died suddenly
during the past academic year. Thus much of our
efforts during the past fifteen months have been
involved with recruiting new faculty. These efforts
have been very successful, with ten outstanding
individuals accepting offers to join our faculty.
Dr. Edvin Underwood was a Senior Research
Scientist here prior to accepting a faculty posi-
tion. Eight of the remaining nine have moved to
Atlanta since April, 1979. Dr. Amyn Teja, pres-
ently at Loughborough University, will join us in
September, 1980. The faculty members and their
areas of interest are identified in Table 1.

The Georgia Institute of Technology began
as the Georgia School of Technology in 1888. The
School of Chemical Engineering evolved from the
chemistry curriculum. An Engineering Chemistry
Program was published in the 1900-1901 catalog.
In addition to chemistry and chemical engineer-
ing topics, areas such as metallurgy, dyeing, me-

Chemical Engineering is housed in the Bunger-Henry

chanics, electricity, minerals, and industrial pro-
cesses were included in this early program. The
1929 catalog listed a B.S. in Engineering Chemis-
try, and the 1930 catalog indicated that a B.S.
in ChE could be obtained under the Department
of Chemistry.
McLaren White, whose father, Alfred H.
White, was an MIT graduate and Head, of ChE
at Michigan, was the first chemical engineer to
come to Tech. This happened during the 1920s,
and Professor White was part of the chemistry de-
partment faculty. Changes toward chemical engi-
neering were too slow to suit Professor White, so
he left. The first-prize for the AIChE contest
problem is named in honor of McLaren White.
The first Chief of the Chemical Engineering
Division within the Department of Chemistry was

*The information presented here is condensed from a
paper, "An Early History of Chemical Engineering at
Georgia Tech," by Marcella M. Lusby, Unpublished (No-
vember, 1977).

The School of Chemical Engineering currently enrolls about 950
undergraduates. This figure includes freshmen who declare a major at Tech
and co-op students who are on work assignments. Cooperative education dates back
to 1915 at Tech. Today nearly 30% of undergraduate ChE's are in the Coop Program.

WINTER 1980 a

Dr. Harold Bunger, who started at Tech around
1929. The name of the academic unit was changed
to the Department of Chemistry and Chemical
Engineering in the 1930s. This department was


Staff: ChE Division

Pradeep K. Agrawal; Assistant Professor; Ph.D. 1979,
University of Delaware; Heterogeneous Catalysis
Charles J. Aloisio; Lecturer; Ph.D. 1970, Purdue Uni-
versity; Polymer Engineering and Science
William R. Ernst; Associate Professor; Ph.D. 1974,
University of Delaware; Heterogeneous Catalysis;
Assistant Director for Ch.E. Undergraduate Pro-
Larry J. Forney; Associate Professor, Ch.E./C.E.; Ph.D.
1974, Harvard University; Aerosol and Particle
.' Technology
George A. Fowles; Adjunct Professor; Retired Vice
President, Marketing, B.F. Goodrich Co.; Plastics
Charles W. Gorton; Professor; Ph.D. 1953, Purdue Uni-
versity; Transport Phenomena, Fluidization
,Edwin M. Hartley; Associate Professor; Ph.D. 1973,
.Georgia Tech; Pulp and Paper Engineering
SH. Clay Lewis; Professor; Sc.D. 1943, Carnegie Insti-
tute of Technology; Chemical Process Design
Albert A. Liabastre; Research Scientist; Ph.D. 1974,
Georgia Tech; Surface Science
Michael J. Matteson; Professor; D. Eng. 1967, Technical
University Clausthal (Germany); Aerosols, Particle
Technology, Air Pollution Control; Assistant Di-
rector for Ch.E. Graduate Programs
John D. Muzzy; Professor; Ph.D. 1970, Rensselaer Poly-
technic Institute; Polymer Engineering, Energy
Conservation, Economics
Allan S. Myerson; Assistant Professor; Ph.D. 1977,
University of Virginia; Thermodynamics, Crystalli-
zation, Biochemical Reactions
Clyde Orr, Jr.; Regents' Professor; Ph.D. 1953, Georgia
Tech; Instrumentation and Particle Technology
Gary W. Poehlein; Professor; Ph.D. 1966, Purdue Uni-
versity; Emulsion Polymerization, Latex Tech-
nology; Director of the School
Ronnie S. Roberts; Assistant Professor; Ph.D. 1976,
University of Tennessee; Biochemical Engineering,
Mass Transfer, Reactor Design
Robert J. Samuels; Professor; Ph.D. 1960, University of
Akron; Polymer Science and Engineering
A. H. Peter Skelland; Professor; Ph.D. 1952, University
of Birmingham (England); Non-Newtonian Fluids,
Mixing and Fluid Dynamics, Heat and Mass Transfer
Jude T. Sommerfeld; Professor; Ph.D. 1963, University
of Michigan; Computer Applications
D. William Tedder; Assistant Professor; Ph.D. 1975,
University of Wisconsin; Process Synthesis, Optimi-
zation and Waste Management
Amyn S. Teja; Associate Professor, Ph.D. 1972, Im-
perial College (London), Phase Equilibria, Thermo-
Henderson C. Ward; Professor; Ph.D. 1953, Georgia

headed by Dr. Boggs, with Dr. Bunger continuing
as Chief of the ChE Division. Both Boggs and
Bunger died in 1941 and the two divisions were
split, forming separate departments. Professor

Tech; Transport Phenomena, Process Design, Co-
Mark G. White; Assistant Professor; Ph.D. 1978, Rice
University; Heterogeneous Catalysis
Jack Winnick; Professor; Ph.D. 1963, University of
Oklahoma; Thermodynamics, Electrochemical Engi-
neering, Air Pollution Control
Ajit P. Yoganathan; Assistant Professor; Ph.D. 1978,
California Institute of Technology; Biomedical Engi-
neering, Polymer Rheology
Alex Zhavoronkov; Visiting Scientist; Ph.D. 1975,
Moscow Technical Institute; Aerosols
Staff: Metallurgy Division
Helen E. Grenga; Professor; Ph.D. 1967, University of
Virginia; Catalysis, Corrosion, Extractive Metal-
Robert F. Hochman; Professor; Ph.D. 1959, University
of Notre Dame; Phys-Chem. of Metals, Corrosion,
Biomaterials; Associate Director for Metallurgy
John E. Husted; Professor; Ph.D. 1970, Florida State
University; Mineral Engineering
Miroslav Marek; Associate Professor; Ph.D. 1970,
Georgia Tech; Corrosion, Dental Materials
Pieter Muije; Associate Professor; Ph.D. 1971, Wash-
ington State University; Metallurgy, Mineral
Stephen Spooner; Professor; Sc.D. 1965, Massachusetts
Institute of Technology; Physical Metallurgy, Metal
Staff: Fracture and Fatigue Research Lab.
Saghana B. Chakrabortty; Research Scientist; Ph.D.
1974, Georgia Tech; Mechanical Metallurgy, Electron
Albrecht Gysler; Visiting Research Scientist; Ph.D.
1965, University of Stuttgart (Germany); Micro-
structure-Properties Relationships
Ludmilla Konopasek; Research Engineer; M.S. 1975,
Manchester University (England); Fracture and
Fatigue of Materials
Fu-Shiong Lin; Research Scientist; Ph.D. 1978, Georgia
Tech; Corrosion, Fatigue, and Ti and Al Alloys
T. H. B. Sanders; Research Scientist; Ph.D. 1974,
Georgia Tech; Aluminum Alloy Development, Micro-
structure and Fatigue
Bhaskar Sarkar; Postdoctoral Fellow; Ph.D. 1979,
Georgia Tech; Stress Corrosion Cracking and
Edgar A. Starke, Jr. Professor; Ph.D. 1964, University
of Florida; Fracture and Fatigue; Director of the
Fracture and Fatigue Research Laboratory
Edvin E. Underwood; Professor; Sc.D. 1954, Massa-
chusetts Institute of Technology; Physical Metal-
lurgy, High Temperature Deformation and Stere-


Jesse Mason became Director of the Chemical
Engineering Department; and Dr. Paul Weber, a
chemical engineering faculty member, was named
Assistant Director of the Engineering Experi-
ment Station.
A reorganization took place in 1948 with Pro-
fessor Mason becoming Dean of the College of
Engineering and Dr. Weber the new Director of
the School of Chemical Engineering. Dr. Weber
held this position until 1955 when he became Dean
of the Faculty (equivalent to the present position
of Vice President for Academic Affairs), and Dr.
Robert Raudebaugh from the Metallurgy Division
was appointed Acting Director of the School of
Chemical Engineering for the year. Dr. W. M.
Newton assumed the acting director position and

The "Ramblin Wreck" Parade, a real demonstration of
student creativity-weird things that move!

served for about three years until Dr. Homer
Grubb was named Acting Director. The name
change from "Department" to "School" was made
to identify ChE as a degree-granting component
of the Institute; the School of Chemical Engineer-
ing offers degrees, the Departments of English,
History, etc., do not. In addition, schools are
generally more autonomous than departments.

One of the reasons for
the dramatic, almost three-fold,
increase in ChE undergraduate enrollment at
Tech during the past five years has
been the number of women and
minorities entering the School.

Dr. Grubb was later named Director of the
School, a position he held until 1965 when Dr. Leon
Bridger became the Director. During this period
the Metallurgy Division developed a significant
graduate program which operated partially inde-
pendently of the Chemical Engineering Division.
Dr. Robert Hochman came to Tech in 1959 and
is currently the Associate Director responsible
for the Metallurgy Division.
Dr. Bridger returned to a full-time faculty
position in ChE during the summer of 1978; and
Dr. Gary Poehlein was appointed Director after
moving to Tech from Lehigh University. The
Fracture and Fatigue Research Laboratory,
headed by Dr. Edgar Starke, Jr., was also es-
tablished in 1978.


A PPROXIMATELY 8500 undergraduates were en-
rolled at Georgia Tech to start the Fall Quarter,
1979. About one-half of these students are resi-
dents of the State of Georgia. The others include
representatives from every other state in the U.S.
and many foreign countries. A selective a'dmis-
sions policy continues to produce a high-quality
undergraduate student body. The 1978 freshman
class had an average SAT score of 1161 comprised
of an average verbal score of 533 and an average
math score of 628. Georgia Tech ranks seventh in
the nation in attracting National Merit Scholars
and second to Harvard-Radcliffe in the' aintu of
National Achievement Scholars enrolled. :
The School of Chemical Engineering currently
enrolls about 950 undergraduates. This figure in-
cludes freshmen who declare a major at Tech and
coop students who are on work assignments. Co-
operative education dates back to 1915 at Tech.
Chemical Engineering became involved later, and
Professor Emeritus Waldemar Ziegler was the
first ChE Coop graduate receiving his degree in
1932. Today nearly 30 percent of undergraduate
ChEs are in the Coop Program.
One of the reasons for the dramatic, almost
three-fold, increase in undergraduate ChE enroll-


The undergraduate program in chemical engineering is quite
rigorous with a good balance between theory and practice. Required courses
include two quarters of transport phenomena, three quarters of unit operations, three quarters
of design, as well as courses in stoichiometry, reaction kinetics, process control, etc.
Engineering drawing and physical education remain as required courses.
i _!J! "

ment at Tech during the past five years has been
the number of women and minorities entering the
School. These numbers have increased from near
zero in 1974 to about 30 percent women and 8
percent minorities in 1979. A second significant
reason for our increased enrollment has been more
participation in dual-degree programs with other
The undergraduate program in chemical
engineering is quite rigorous with a good balance
between theory and practice. Required courses in-
clude two quarters of transport phenomena, three
quarters of unit operations, three quarters of de-
sign, as well as courses in stoichiometry, reaction
kinetics, process control, etc. Engineering draw-
ing and physical education remain as required
Students come to Georgia Tech expecting to
work hard, and most are willing to make the

Jack Childs checks the assembly of Polymer Fabric Ex-

necessary commitment to succeed. The vast ma-
jority leave Tech with a very high opinion of the
Institute and a fond feeling for Atlanta. This
loyalty is clearly manifested in the fact that
Georgia Tech almost always ranks first among
the nation's public institutions in terms of support
by alumni and alumnae.


T HE GRADUATE PROGRAM is in a period of rapid
growth. The addition of ten new faculty mem-
bers should provide us with the manpower neces-
sary to improve an undergraduate program that
is already quite good and, at the same time, to
build a graduate program of equivalent stature.
Enrollment of full-time graduate students in the
Fall of 1978 was about 55. These students were
about equally divided between the ChE and Metal-
lurgy Divisions. Present graduate enrollment in-
cludes 61 chemical engineering students and 40
metallurgy students.
New graduate students entering the School of
Chemical Engineering in September, 1979, con-
sisted of 33 U.S. citizens and 9 from other
countries. Thirty-six of these students are in the
ChE Division and 6 in the Metallurgy Division. A
continuation of this sort of success in recruiting
graduate students will insure the proper develop-
ment of our graduate program. We would like to
achieve a steady-state graduate enrollment of
about 100 ChEs and 40 Mets. with an 80/20
balance between citizens and non-citizens.


T HE NUMBER OF NEW faces at our first faculty
meeting in September prompted a request for
round-the-table introductions. Of course, faculty
on our staff last year had an opportunity to meet
the new faculty during the campus visits. In fact,
a number of significant working relationships
have already been developed between new faculty
and those continuing to serve on our staff. During
a year when more than fifty interviews occurred,
however, names and faces can become confused.
This introduction exercise clearly illustrates
that the School of Chemical Engineering at
Georgia Tech is indeed in "A Period of Rapid
Transition." Prediction of the future in such an
environment is surely an uncertain endeavor. Our
faculty and students are very optimistic. We look
forward to an exciting period in the life of an out-
standing institution. O


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441t ec444HfMJe"

and Biochemical Engineering
at the University of Pennsylvania

University of Pennsylvania
Philadelphia, PA 19104

T HE PAST ACADEMIC year served as a milestone
for the field of biochemical engineering and
the University of Pennsylvania. Not only did the
year mark the 25th anniversary of the biochemi-
cal engineering program at the University, it was
also the 25th anniversary of the leadership of the
program by its founder at Penn, Arthur E.
There are older and larger biochemical engi-
neering programs in existence, but none can rival
the record of Penn's program in terms of its dy-
namic growth and production of graduates who
have gone on to become leaders in the field. To
mark these achievements, the University hosted a
special 25th anniversary symposium to which all
the graduates of the program were invited. The
"alumni" who attended participated in panel dis-
cussions on the future of biochemical engineering
in the areas of food production (discussion led by
Stanley Barnett), energy production (led by
Charles Cooney), production of chemicals (led by
Daniel Wang), and preservation of the environ-
ment (led by Larry Erickson), with a roundtable
discussion on the future of biochemical engineer-
ing education led by Richard Mateles.

IN 1953 ART ARRIVED at Penn, fresh from his PhD
studies in chemical engineering at Columbia
University. While working on his doctorate, he

As a scholar of biochemical
engineering in general, and fermentation
technology in particular, he has published
over 150 technical papers and co-authored
two textbooks which are regarded
as the bible in their fields.

Copyright ChE Division, ASEE, 1980

Art inspects the fermenter laboratory.

developed an interest in fermentation technology
and subsequently took additional training in food
technology at M.I.T. At Columbia, Art, along
with Ernest Henley (now at the University of
Houston), was the first doctoral student of Pro-
fessor Elmer Gaden who was later to be cited as
the "father of biochemical engineering" (in a
cover story in the May 31, 1971 issue of Chemical
Engineering News). It was through Elmer
Gaden's influence that Art's interest in fermenta-
tion systems matured. Elmer had written his own
thesis on "Mass Transfer in Fermentation
Systems under the supervision of Arthur W.
("Pop") Hixson at Columbia, working in conjunc-
tion with a biochemical engineering team (Karow,
Bartholomew, and Sfat) at the Merck Company.
(It is of some interest to note that reporting of
the 1945 McGraw-Hill Process Development
Award, presented to Merck for its "Biochemical
Engineering Development of the Penicillin Pro-
cess," is apparently the first mention of "bio-
chemical engineering" in the chemical engineer-
ing literature.)
Art joined Penn's chemical engineering faculty


as an assistant professor and in the fall term of
1953 offered a new course in biochemical engineer-
ing. Since 1953 the biochemical engineering pro-
gram has grown steadily, and in 1972 it was
officially recognized when the Department of
Chemical Engineering formally changed its name
to the Department of Chemical and Biochemical

today's usage, it is nevertheless the appropri-
ate term to characterize the founder of Penn's
biochemical engineering program-Art Humph-
rey. Whether at work in his laboratory, or lead-
ing a faculty debate, or scaling a mountain in
Guatemala, Art is possessed of energy that leaves
others much younger in a race to catch up, and he
inspires his contemporaries to set equally chal-
lenging goals for themselves.
In his 25 years at Pennsylvania, Art has es-
tablished professional credentials that are indis-
putable. As a scholar of biochemical engineering
in general, and fermentation technology in par-
ticular, he has published over 150 technical
papers and co-authored two textbooks which are
regarded as the bible in their fields, Biochemical
Engineering (Academic Press, 2nd ed., 1976) and
Fermentation & Enzyme Technology (John Wiley,
1979). He holds three U.S. patents and has actively
consulted for more than 20 chemical companies
during his career. He has served on and chaired
numerous AIChE committees including the FBP

Art seems to approve of his students' efforts at office

Over the years he has formed
a special bond with his students, based
on mutual respect, willingness to devote intense
effort to a project, and in no small
measure on the ability to dish
out and take a practical joke.

Division, and between 1975 and 1978 was a di-
rector of the organization. He has also been a
past chairman of the MC&T Division of ACS and
of the Working Group on the Production of Sub-
stances by Microbial Means of the US/USSR
Committee on Cooperation in Science and Tech-
nology. In addition, he served from 1971-1973 as
a member of the NSF Advisory Committee for
Engineering. In 1973 he was elected to the Na-
tional Academy of Engineering.
Such a summary of professional activities,
however, doesn't begin to capture Art Humphrey,
the man, who by virtue of his enthusiasm and
exuberant love for life succeeds in making people
want to work together toward a common goal. Art
always has a full complement of five doctoral
students to work with him as advises or, more
appropriate to the man, associates. Over the years
he has formed a special bond with his students
based on mutual respect, willingness to devote
intense effort to a project, and in no small measure
on the ability to dish out and take a practical joke.
For pranks he's played on his students, Art was
rewarded on one occasion with the careful "re-
decoration" of his office (as shown in the ac-
companying photograph) and on another with the
clamping of a ball and chain on his leg only
minutes before he was to make a presentation to
the University Trustees. In Houdini-like fashion
he arrived before the Trustees on time sans ball
and chain.
Art is an avid outdoorsman who cheerfully
ignores middle age (and some say common sense)
as he pursues his interests. Having hiked the trails
of much of this country, he frequently substitutes
an opportunity to climb a mountain in a foreign
country in place of the honorarium he would re-
ceive for lecturing there. Such negotiations have
enabled him to climb Mount Fuji in Japan, Pop6-
catepetl in Mexico, and Augua in Guatemala,
among others. Last year when taking up skiing
for the first time, Art found himself by mistake in
an advanced intermediate class and, not having
the good sense to get out of the class, "mostly fell


Collectively, this group conducts a research program amounting to
$500,000 a year, and this past year they published the program's 150th
paper on biochemical problems.

down the hill" and received a National Standard
Medal for downhill racing as a result. Each year
Art leads a departmental canoe trip down the
Delaware River, an activity he organized 16 years
ago (when Bob Bird was a member of that group).
The annual event now involves between 60 and
70 people, including faculty members, students,
alumni, and participants from other schools. This
year an eight-mile run was included as part of
the trip, and he typically outpaced the younger
generation-without having trained for the run.
The honesty and openness with which Art ap-
proaches every aspect of his life generates an un-
swerving loyalty among his associates. Never
afraid to admit when he's wrong or simply doesn't
know an answer, he leads people to trust that
they'll "hear it straight," good or bad, in dealing
with him. Add to these qualities Art's rare talent
of being a good listener, and the result is an in-
dividual who is extremely effective in accomplish-
ing the work he sets out to do. His spirit has
inspired and guided the development of Penn's
biochemical engineering program over 25 years,
and it has set the tone with which the biochemical
engineering faculty now approaches the next 25

ART HUMPHREY STILL heads the biochemical
engineering program within the University's
Department of Chemical and Biochemical Engi-
neering, despite his heavy administrative load as
Dean of the School of Engineering and Applied
Science. (From 1962 until he was named Dean in
1972, he served as Chairman of the Department
of Chemical Engineering.) Art and three others
of the Department's 12-member faculty have the
focus of their teaching and research activities in
the area of biochemical engineering. At least three
others conduct a significant portion of their re-
search within the field. Collectively, this group
conducts a research program amounting to
$500,000 a year, and this past year they published
the program's 150th paper on biochemical engi-
neering problems (out of a total of more than 350
scientific articles published by these individuals).
Six national AIChE, ACS, and ASEE awards have

been won by members of the group, and two mem-
bers have been elected to the National Academy
of Engineering.
Those members of the faculty of the Depart-
ment of Chemical and Biochemical Engineering
who participate in the biochemical engineering
program are:

David J. Graves:
Arthur E. Humphrey:
Douglas A. Lauffenburger:
Mitchell D. Litt:
Daniel D. Perlmutter:
E. Kendall Pye:

John A. Quinn:

enzyme kinetics
fermentation technology
cell population dynamics
enzyme reactor dynamics
enzyme behavior and
bound membrane systems

The facilities which are used in both the re-
search and teaching functions of the biochemical
engineering program consist of four primary
laboratories: the fermenter laboratory, a wet
chemistry laboratory for enzyme analysis, a mem-
brane laboratory, and a reactor laboratory.
The fermenter laboratory (pictured in an ac-
companying photograph) centers about a 70-liter
highly instrumented fermenter that is coupled to
a PDP 11/34 computer with a 96K core capacity
and three discs (two fixed), a Calcomp plotter
and a video screen for data acquisition and
control. The facility is supported by a Nuclide
Mass Spectrometer and other appropriate analysis
equipment. In addition, the laboratory has a
number of smaller fermenter units, including a
20-1, 14-1, two 1-1, and five 500-ml systems-most
having temperature, pH, foam, and dissolved
oxygen control.


U NDER THE LEADERSHIP of Art Humphrey, the
biochemical engineering faculty has always in-
sisted that the academic program remain a part of
the basic program in chemical engineering, allow-
ing the "biochemical" aspects of the program to
emerge from an emphasis on biological processes.
Because of the emerging significance of bioconver-
sion processes in the production of energy, food,
and chemical feedstocks and as a means for con-
trolling the environment, students are eager to in-
vestigate these problems. The faculty believes the
students' eventual careers are better served by


having them pursue these interests from a solid
foundation in chemical engineering, rather than
by focussing exclusively on a subspecialty.
Thus, the undergraduate biochemical engineer-
ing student takes the standard chemical engineer-
ing curriculum, but biochemistry is substituted for
one. of the courses in organic chemistry, as is a
biology course for the course in nuclear physics.
In addition, the student will take two or three
courses in microbiology, biological processes, utili-
zation of wastes, biochemical engineering, or food
engineering as his senior technical electives; and
his senior research project will focus on a bio-
logical process.
Out of a senior chemical engineering class of
45 students, about 7 of them will be taking courses
with a focus in biochemical engineering. Most of
these students will either continue their biochemi-
cal engineering studies at the graduate level or
will enter medical school.
At the graduate level the student planning a
focus in biochemical engineering is also expected
to take the core courses in chemical engineering-
in applied mathematics, transport processes, re-
actor design, and thermodynamics. The student is
then expected to take courses in advanced bio-
chemistry, molecular biology, and genetics, in addi-
tion to the four basic graduate courses in bio-
chemical engineering.
The basic graduate level biochemical engineer-
ing courses include:
Biochemical Engineering: fermenter kinetics, design
and operation

Biological Processes:

Enzyme Technology:

At any given time, about 15 students in the
chemical and biochemical engineering graduate
program (which numbers approximately 50 full-
time students) will be focussing their studies in
the direction of biochemical engineering. Upon re-
ceiving their doctoral degrees, these individuals
generally seek employment in the food production,
pharmaceutical, waste treatment, and chemical
process industries, or in academia.
When questioned, most of the alumni of Penn's
biochemical engineering program say they con-
sider themselves chemical engineers who have an
interest in biological processes, for such is the
slant of their curriculum. This may in part ex-
plain why Penn graduates have never encountered
problems on seeking employment. Indeed, a recent
graduate of the program looking for a position in
the biochemical field received more than ten offers
from firms, with several offers in excess of $31,000
a year.


T HE FACULTY OF THE biochemical engineering
program at Pennsylvania looks forward to con-
tinued growth of the program. The field is now

physics and chemistry of
biological processes
behavior and utilization of

Utilization of Wastes: waste utilization
and treatment
These courses are taught by the faculty on a
rotating basis, i.e., once every other year. They
are frequently team-taught with the help of visit-
ing professors and members of the University's
Department of Biochemistry and Biophysics.
Students in the graduate program can develop
and shape their programs to serve their own par-
ticular career emphases by selecting additional
courses in areas ranging from nutrition to micro-
biology. They are free to select these courses from
throughout the University's graduate and profes-
sional programs, including its Medical School and
School of Veterinary Medicine.

Over 60 faculty members and students now participate
in Art's annual canoe trip down the Delaware River.
coming into its own and the opportunities are
unlimited. Perhaps the enthusiasm of those active
in Penn's biochemical engineering program comes
across best in the words of the man responsible
for its flourishing here-Art Humphrey.
"Never has the future for biochemical engi-
neering looked so bright. This is due largely to
the energy crisis and the attendant emphasis on
the use of renewable resources, meaning materials
of biological origin. It seems fairly evident that
many of these materials will be processed by bio-


logical means, with the use of enzymes, in order
to achieve low temperature, energy saving pro-
cesses. The environmental crisis and the increas-
ingly strict limits placed on the use of nitrates,
phosphates, and other surface water contaminants
mean that more efficient and more complicated
waste treatment systems will have to be evolved.
Also, wastes will be viewed in the future as valu-
able resources which can be treated to yield useful
"Perhaps the most significant development
affecting the future of biochemical engineering is
the explosion of knowledge concerning genetic
engineering techniques. Not only do we now
possess the ability to cultivate both animal and
plant tissue cells in large-scale reactor systems,
but we can transfer their genetic information for
making various biologically active molecules such
as, insulin into more easily cultivated bacterial
cells by gene splicing techniques. Soon the
scientist will be able to create cells with virtually
any desired metabolic activity. When this comes
to pass, the biochemical engineer will become
active in efficiently simulating and optimizing
many of nature's special reactions in stainless steel
fermenters. In many ways biomass can be re-
garded as the crude oil of the future. Just as crude
oil now serves as the feedstock of the petrochemi-
pal industry, from 'barrels of biomass' will come a
number of the chemical feedstocks of the future. It
Would not surprise me to see biomass refineries
emerging within the next decade.
"I for one will welcome the change. I believe
the chemical engineering textbooks of the future
will reflect this change and will include examples
of biomass problems along with those from the
petroleum ,industry. Chemical engineering is a
truly broad-based discipline, and I believe it is
already demonstrating its concern not just with
physical and chemical changes, but with biological
changes as well." FE

RMNbook reviews

Edited by Z. G. Szabo, Elsevier Scientific, 1976
Reviewed by John B. Butt, Northwestern U.

This monumental two volume set is an essay
of the Catalysis Club of the Hungarian Academy
of Sciences with individual chapters contributed

Use CEE's reasonable rates to advertise. Minimum rate
% page $50; each additional column inch $20.
(Please mention CEE when responding to ad.)
CHAIRPERSON. The Department of Chemical and
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recognized. The candidate must have administrative and
leadership abilities and be able to represent the depart-
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cellent undergraduate program, numerous active research
programs and seeks "first rank" status over the next
decade. In the past five years, the Engineering School
as a whole has expanded its graduate programs sig-
nificantly and currently ranks sixth nationally in total
external funding (over $8 million). The salary is open.
The deadline for applications is April 1, 1980. Submit re-
sume and four letters of recommendation to Prof. H. Litt-
man, Chairman, Search Committee, 123 Ricketts Bldg.,
RPI, Troy, NY 12181. RPI is an Affirmative Action/Equal
Opportunity Employer.

by thirteen different authors. In many ways the
work is reminiscent of the series "Catalysis"
edited by Prof. P. H. Emmett in the 1950's, and
it promises to be as useful. True to the title, the
entire field of contact catalysis is treated, starting
with the fundamentals of solid state science,
chemisorption and kinetics in the first volume,
with applications concerning preparation, charac-
terization, and catalytic reaction engineering in
the second volume. The topics included are treated
in quite some detail and in many instances
represent current state of the art in both catalysis
research and applications.
With so many different aspects of the field
treated in such detail, it is difficult in a review of
reasonable length to do other than cite certain
parts that are of particular use to the reviewer.
In this respect, there are particularly fine treat-
ments of adsorption on solid surfaces and physical
characterization methods which eclipse much
existing literature. For example, the characteriza-
tion methods discussed include x-ray diffraction,
electron-optical methods, magnetic properties,
electrical properties, adsorption, infrared and
EPR spectroscopy.
Another very useful chapter deals with the
preparation of catalysts. This is particularly
timely now, since we have attained sufficient
abilities in characterization that the long-time
Continued on page 44.


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JIM lecture



Institute de DesarroUo Tecnol6gico para la Ind.
3000-Santa Fe, Argentina

A quick survey of the classical literature on
chemical kinetics and reactor analysis reveals
different criteria concerning the definition of the
rate of reaction. Relying on historical rather than
rational bases, the following "definition" has been
ri = (1)
Eq. (1) was probably derived from the first
physicochemical studies on rates of reaction de-
veloped in constant volume batch systems.
This "definition" has been used by Glasstone
[1], Benson [2], Daniels [3], Laidler [4], Frost and
Pearson [5], and Johnston [6], among others.
On the other hand, chemical engineers mainly
engaged in design problems, distrusted the validity
of the "definition," taking into account its in-
applicability to reacting systems of variable
volume. The alternative "definition" was based on
the number of moles instead of concentration. The
difference lies in defining beforehand an extensive
rate of reaction which can then be turned into an
intensive property dividing by the reaction volume.
r' d (2)

ri d (3)
V, dt
The greater generality of expression (3) as
compared to equation (1) is easily demonstratable,
in either conceptual or mathematical terms.

*This paper is the result of mutually beneficial dis-
cussions on the subject with my former classmates
Charles Allen and Sieghard Wanke. Any merit to this
paper is theirs. Any errors in it are mine.

The "definitions" belonging to the kind pro-
vided by equation (3) can be found in books such
as those written by Hougen and Watson [7],
Smith [8], Levenspiel [9], Walas [10], Boudart [11],
Pannetier and Souchay [12]; and with explicitly
stated limitations by Kramers and Westerterp
[13], by Aris [14] and Denbigh [15] as well. Many
other cases could be quoted.
A good example for analysis is the "Continuous
Flow Stirred Tank Reactor" (CFSTR). In this
particular case the product is continuously re-
moved at the system outlet and it becomes evident
that at the steady state dNi/dt is zero (the product
being species i) but the rate of reaction is utterly
different from zero. Here, as Denbigh remarks, ex-
pression (3) is not valid, either. This author tries
to narrow the applicability of the "definition" (3)
to processes where the only change in reactant i is
due to a chemical reaction. This would exclude any
other form of physical phenomena causing changes
in reactant concentration. The restriction seems
valid for the CFSTR and for all forms of diffusive
flows. Nevertheless, it does not seem so clear for
the "Piston or Plug Flow Reactor" (PFR), in
which if, on the limit, dt is taken as the reacting
mass average residence-time in the elementary re-
action volume of length dz, equation (3) may be
properly applied with some substitutions.*
This work shows the futility of arguing about
the accurate "definition" of the reaction rate and

*It should be noticed that now vz may be a function of
z if changes in the number of moles take place.

This work shows the
futility of arguing about the
"definition" of the reaction rate and
the convenience of dealing with the subject
from a different viewpoint.

( Copyright ChE Division, ASEE, 1980


the convenience of dealing with the subject from
a different viewpoint, that is, drawing the
necessary equations from a more fundamental
principle, as the general mass conservation equa-
tion for multicomponent systems would be.


S FAR, IT IS obvious that the existing "defini-
tions" seem to depend either on the author's
personal likings or on the reactor to which the
equations will be applied.
It seems logical to assume that any reaction
rate should be a function not of the system in
which it has been determined but only of tempera-
ture, pressure and concentration of the species
participating in the reaction, just to mention the
most commonly encountered variables affecting
the rate. The reaction rate could be naturally in-
fluenced by the type of reactor-continuous or
batchwise-but only up to the extent that it may
affect concentrations, temperatures or pressures.
It is necessary to reconcile an expression de-
rived from the ontological concept of the rate of
reaction with a mathematical equation expressing
exactly the same, involving the variables suscepti-
ble of experimental measurement.
Ontologically (and considered as an intensive
property), "The rate of reaction is the change in
the number of moles which takes place in unit time
and unit reaction volume, due to a transformation
of reactants into products."
The mathematical expression of the above de-
finition will be set equal to the kinetic equation of
the chemical system under consideration; i.e. if
such a definition is adequately represented by a
mathematical proposition which will be called r,
it is evident that:
r = ) (C,, C2 .... etc. T, P, etc.) (4)
where 4 depends on the complexity of the reacting
system (order, molecularity, activation energy,
etc.). It is the concern of this work to determine
the adequate formulation for the left-hand side of
equation (4).
The problem at issue has been partially, even
though quite accurately, discussed by Petersen
[16] and also singularly viewed by Amdur and
Hammes [17], particularly for batch reactors. The
reader may resort to the quoted references.
In many cases, experimental measurements will
register not only the change in concentration but
also the resultant of the chemical process of re-

Alberto E. Cassano is the founder and Chairman of INTEC; Pro-
fessor at the Universidad Nacional del Litoral and Member of the
Scientific Research Staff of the National Council for Scientific and
Technological Research of Argentina. He received his Chemical Engi-
neer's degree from the Facultad de Ingenieria Quimica of U.N.L.
(Santa Fe, Argentina) and his Ph.D. degree from the University of
California, Davis. His research interests are in Photochemical Re-
actors and Gas-Liquid Reactions Catalyzed by Solids. At present he
is also responsible for a consulting contract (undertaken by INTEC)
for the Argentinian Atomic Energy Commission engaged in the de-
velopment of a Heavy Water Experimental Plant.

action and the physical processes of diffusion, con-
vection and volume changes. From this point of
view, all the "definitions" previously analyzed are
erroneous and inaccurate, and only applicable, at
best, to systems universally used but no less par-
ticular (e.g. the constant volume stirred batch re-
actor, etc.).
Petersen clearly points out that the left-hand
side of equation (4) is a direct resultant of the ex-
perimental system employed in kinetic determina-
tions, and that, therefore, there is no single de-
finition which could be widely used, still less if
the reacting system were non-isothermal. This
statement can be effectively generalized and is the
subject of the next paragraph.

F THE RATE OF reaction is to be defined, the
problem is usually reduced to finding the rate
of change of the reacting species with respect to
some independent variable (time in a batch reactor
and position in many continuous reactors). The
rate of change of the reacting species is generally
measured considering the change in the number
of moles of the said reactant or the rate of change
in its concentration.
An apparent way of solving the problem would
be to consider the reaction within a species ma-
terial volume, instead of the generally used fixed


control volume. But it is difficult to think of a
species material volume since they are not pre-
served [18]. If the "particles" of the material
volume are elements, the difficulty is overcome at
the expense of a greater complexity. Therefore,
this strategy is quite troublesome.
A more adequate way of looking into the
problem for an isothermal system is to consider
the various mechanisms which can bring about
concentration changes of a reactant within a
system and, then, determine which part of these
total changes is due to the chemical reaction, sub-
tracting all contributions other than the reaction.
This means to state in detail a mass conserva-
tion balance for a multicomponent system. Gener-
ally speaking, there are two categories of phe-
nomena through which a species concentration
may vary in a fixed volume in space: (1) The
species may appear or disappear by chemical re-
action and (2) There is a net flow of this species
through the area of this volume element. This flow
mechanism, be it diffusion, forced convection or
any other means of mass transport, needs not be
detailed here. The description of this flow will ex-
clusively depend on the system at stake.
The general conservation equation may be thus
written [19]:
C + V Ni = ri (5)
or in a more general way: if a, is the stoichio-
metric coefficient of species i:
ri = r ai (6)

-Ci + V 'Ni = ar (7)
This well known conservation equation is the only
general formulation for homogeneous isothermal
rates of reaction that is independent of the re-
action system being employed. It clearly shows
that the rate of reaction is the "source" or "sink"
term'in the mass inventory; therefore all the re-
maining non-zero terms resulting from taking r
out of expression (7) must be substituted into the
right-hand side of equation (4).

So far, it is obvious
that the existing "definitions" seem
to depend either on the author's personal
likings or on the reactor to which
the equations will be applied.


EQUATION (7) WILL now be used to obtain the
adequate expressions for some classical react-
ing systems. The following homogeneous iso-
thermal systems will be considered:
1) Isothermal constant volume batch reactor
2) Isothermal variable volume batch reactor
3) Steady state, isothermal continuous plug flow re-
4) Steady state, isothermal continuous flow stirred
tank reactor
In every case, the adequate assumptions will
be made in order to allow an analytical description
of the flux Ni so as to simplify the rate expression.

F WE ASSUME THAT properties are constant in
the whole volume of the reactor (especially con-
centration and temperature), then the divergence
of the flux becomes zero since Ni will be inde-
pendent of position. Therefore, if V Ni=0, equa-
tion (7) is reduced to:
1 dC1
r = (8)
ai dt
where the derivative is now total insofar as con-
centration will be a function of time only.

TF WE ASSUME THAT the expansion of volume is
slow so that, as in the previous case, such proper-
ties as concentration, pressure and temperature
are independent of their position within the re-
actor, no diffusional effects whatsoever will result,
and the flow will be caused only by expansion.
In this case, by definition:
Ni =*
but, as all species expand at the same rate:
VI = Vj = V "=V*
the velocity of all species coincides with the global
velocity of the system.
With the previous relationships, equation (7)

S+ V (C v) = a r
But, since it has been assumed that concentration
is independent of position V Ci = 0. Then:

i+ Ci (V v) =air (9)
Continued on page 48.
Continued on page 48.



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P1 ";i Lr-F-p




University of California
Santa Barbara, CA 93106

Santa Barbara began in the mid-1960's with
an intended emphasis on the process control part
of the curriculum. The use of digital computers
for data acquisition and control, what often is re-
ferred to as real-time computing, at that time was
an object of relatively intense interest in industry.
However, except for one or two schools with the
financial resources to acquire an industrial-scale
computer (e.g. IBM 1800), there was little op-
portunity for universities to give students hands-
on experience with data acquisition and control
The appearance of the minicomputer in the late
1960's made it possible for virtually any depart-
ment to acquire or build a real-time computing
facility which could be used in teaching and in re-
search. The more recent introduction of the micro-

Duncan A. Mellichamp is Professor of ChE at the University of
California, Santa Barbara, where he was initially responsible for de-
velopment of the process dynamics and control program. An early
interest in computers led subsequently to activities with the CACHE
Real-Time Task Force (Chairman 1974-76), to the CACHE Corp. Board of
Trustees (President 1977-78), to the Editorship of the CACHE Mono-
graph series in Real-Time Computing, and to a long succession of
aggravations associated with building and maintaining a real-time
laboratory facility. He would like to forswear all future activities in-
volving computers, but cannot.

processor (and microcomputer) has merely ac-
celerated the trend of chemical engineering depart-
ments to install real-time facilities and to introduce
elements of real-time computing into the curricu-
In the past few years, the early fascination
with hardware and software among real-time

Topics Covered in Undergraduate Control Courses
(2 hr. lecture and 3 hr. lab per week for two quarters)
Derivation of process dynamic models
Transfer function models
Open- and closed-loop systems
Frequency-response methods for controller design
Process applications
Overview of advanced control methods

users has decreased to some extent, and the more
important educational questions of what, where,
and how to teach this new subject area are re-
ceiving more attention. Since real-time computing
was and is tied to the subject of process control,
it seems reasonable to explore some ideas concern-
ing the teaching of real-time computing within
that context. The chemical engineering depart-
ment at U.C. Santa Barbara has developed what
must be one of the most extensive teaching and
research programs in real-time computing in this
country (at least among chemical engineering de-
partments) ; and I would like to describe it, to
discuss some of the background behind its de-
velopment, and to note how it is changing. To
begin with, however, it might be useful to discuss
the process dynamics and control program which
now coordinates with the more recently developed
real-time computing program.

SN DESCRIBING THE PROCESS control program at
UCSB, it probably is fair to say that it is a tra-
ditional one. Two one-quarter undergraduate
courses are required of all seniors and the usual

Copyright ChE Division, ASEE, 1980


If there is any non-traditional aspect of the undergraduate program
it would be the emphasis on "practical" experiments. The associated laboratory contains
several experimental units for the study of liquid level and stirred tank heating dynamics
and control, pneumatic and electronic control systems, and simulation facilities ....

range of topics is covered. Depending on who is
teaching the course, there may be more or less
emphasis on process dynamics and on "advanced
control" topics; nevertheless the core areas listed
in Table 1 are fairly rigorously and extensively
If there is any non-traditional aspect of the
undergraduate program it would be the emphasis
on "practical" experiments. The associated labora-
tory contains several experimental units for the
study of liquid level and stirred tank heating dy-
namics and control, pneumatic and electronic
control systems, and simulation facilities for other,
more complex processes. The experimental units
are all bench scale and designed to have time
constants on the order of one to two minutes.
Since individual dynamics and control experiments
can be carried out in 15 to 30 minutes, a whole
range of experiments (summarized in Table 2)
can be run during the two quarters. Students write
up their results in brief (i.e. memo) form;
although theory underlies all experimentation,
emphasis is on the use of theory to evaluate practi-
cal consequences such as "Will the surge tank
system overflow?", "Is the catalyst mixing system
adequately stirred?", etc. By the end of two
quarters students will have designed and tested
Undergraduate Process Dynamics
and Control Laboratory Experiments
Liquid level system:
1. Step response
2. Pulse response
Stirred tank heating system:
3. Step response
4. Transportation lags
Stirred tank reactor (simulated):
5. Model parameter fitting
6. Steady-state optimization
1. Dynamic characteristics of three-mode controllers
2. Control of 1st- and 2nd-order systems
Stirred tank heating system:
3. Frequency response
4. Closed-loop control system design
Liquid level system:
5. Closed-loop control system design

Topics Covered in Graduate Control Courses
(3 hr. lecture each week, per course)
Derivation of models for multivariable systems
Formulation of state space models
Solution of multivariable system models (matrix
Modal analysis
Design of controllers using modal theory
Simulation and computer-aided controller design
Discrete systems analysis
Sampled data systems
Sampled data controller design (or digital control
Decoupling control systems
Controllability, observability, etc.
Optimal control: quadratic and time-optimal
Analysis of stochastic systems
Observers, filters and state estimators
control systems for each of the laboratory bench
scale processes using: (1) theory only, (2) em-
pirically-determined process models, and (3) on-
line (loop-tuning) methods.
At the graduate level we presently offer two
courses in process dynamics and control. In recent
years the first course has covered both time and
frequency-domain methods with emphasis on state
space techniques used in conjunction with the com-
puter for analysis and design. The course deals
substantially with multivariable systems and, at
least in part, parallels the undergraduate courses
at an advanced level (Table 3).
The second graduate course covers advanced
control topics exclusively (also summarized in
Table 3). Although the graduate offerings are
traditional in nature (there are no laboratory ex-
periments at the graduate level), the rigorous yet
extensive coverage of advanced materials reflects
the same approach as at the undergraduate level.


O NE OF THE MAIN PROBLEMS in bringing new
material into the curriculum is that (usually)
an equivalent amount of old material will have to
come out. In developing the real-time teaching
program we began with four basic tenets:
1. Real-time computing instruction will be offered to both


undergraduate and graduate students on an elective
2. Real-time computing course work will supplement, not
replace, existing process control course work.
3. Real-time computing will be taught from a fundamental
point of view. Students will be expected to understand
basic hardware and software structures and how they
are used.
4. Lectures in real-time computing will be paralleled by a
"hands-on" laboratory with appropriately-designed ex-
We have followed these principles substantially
down to the present day; hence a few words of dis-
cussion might be appropriate: Tenet 1 arose out
of an early realization that many chemical engi-
neers, not just a few, will be involved with on-line

.... the ratio of "outsiders" to
chemical engineers was about 30/70 in
this second year; through the last academic
year it has been more like 70/30, with the
number of chemical engineering students
relatively constant at 12-15.

process computing as part of their professional
careers. Tenet 2 was based on a natural reluctance
to tamper with established control courses, in par-
ticular to remove some significant amount of ma-
terial so as to introduce lectures on real-time com-
puting. Tenet 3 might well be open to argument
but has its parallel in the controls area: twenty
years ago many people felt that control theory was
not chemical engineering; probably no one today
would argue in favor of a control course based
totally on an empirical approach. Our experience
with chemical engineering students is that they
do not, in general, like to spend time on computer
fundamentals; nevertheless those who do find that
practical applications are much easier to under-
stand and are able to transfer their knowledge to
other real-time systems much easier. Tenet 4 will
need no explanation.
Historically, we began our real-time course
offerings with a one-quarter graduate seminar in
Spring 1972 and followed it immediately in the
Fall of that year with a senior-level elective course
open to graduate students. Development of the
course and the associated laboratory were under-
written by the National Science Foundation
through two grants totalling almost $100,000
ver .a three and one-half year period. In the Fall
of i973 the course was elected by about twice as
many chemical engineering students (ten).
Several electrical: engineering students also took

the course; in fact the ratio of "outsiders" to
chemical engineers was about 30/70 in this second
year; through the last academic year it has been
more like 70/30 with the number of chemical
engineering students relatively constant at 12-15.
In the past three years we have had to restrict
enrollment because of the limitation in our real-
time laboratory facilities.
One of the interesting developments that came
out of the real-time computing course resulted
from the large number of student requests for se-
quel courses in the same area, but covering more
advanced topics. Many of the requests came from
electrical engineering or computer science students
who claimed that there were no equivalent appli-
cations courses within their own departments.
Additional requests came from some of our own
students, both undergraduate and graduate, who
planned to work in the process computer control
applications areas. The real-time field naturally
divides into three applications areas: (1) single
process/single computer, e.g. the topics covered
in our first course, (2) multiple processes/single
computer (multitasking or multiprogramming ap-
plications), (3) multiple processes/multiple com-
puters (multiprocessing or networking). So far as
the author can determine, it generally is the case
that the real-time instruction offered by most com-
puter science departments is (a) non-existent, (b)
concerned only with on-line systems, e.g. airline
reservation systems, (c) theoretically- rather than
practically-oriented, e.g. concerned with hypo-
thetical job scheduling problems in a multipro-
cessor environment. Condition (c) holds on our
campus; hence in order to accommodate student
requests we decided to add two additional courses
to our offerings to cover substantially multitask
programming and operating systems for real-time
applications, and networking and digital computer
control systems.
Several points are worth noting here concern-
ing the decision to expand the real-time computing
course to a full-year sequence:

* Some of the specialized computer-oriented material we
now teach is outside the area of expertise of most
chemical engineering faculty even though the applica-
tions-oriented material is not. We have avoided po-
tential problems somewhat by using a Teaching Associ-
ate, a Ph.D. candidate in computer engineering, to share
teaching responsibilities and to supervise the labora-
tory. In the four years we have offered the full se-
quence, several students working on joint research
projects involving the real-time laboratory facilities
have been supported financially in this way and have


contributed significantly to the development of our
teaching and research program.
Attenuation of students enrolled in the sequence
historically was relatively high, running 40-50% per
quarter. Hence by the third quarter the enrollment
might have dropped from approximately 40 to about
10; most students continuing through the entire se-
quence have been our own graduate students, chemical
engineering undergraduates who have accepted jobs
involving a process control starting assignment, com-
puter science undergraduates, and undergraduate or
graduate electrical engineering students with an interest
in computer applications.
Chemical engineering students who have taken the real-
time sequence along with the required courses in dy-
namics and control have relatively little difficulty finding
employment in process-control-related areas. Several
process-oriented companies now recruit process control
engineers actively at Santa Barbara and, if statements
from recruiters can be believed, would have hired about
twice as many students for control work last year if
they had been available.
The mixing of chemical engineering students who have
relatively little computer background (in general only
experience in programming a higher-level language, i.e.
FORTRAN) together with computer science students
who have little or no experience with physical equipment
never was totally satisfactory. The distribution of abili-
ties in any particular prerequisite subject area is in-
variably bimodal: e.g. ChE students will have relatively
little background in binary arithmetic and logic (com-
puter science students will feel they have mastered the
subject); the reverse situation is true in the area of
physical measurements and measurement errors. This
situation led to major problems in the introductory
course where so much of the lecture material must
cover topics which will appear to be elementary to a
computer science major.

This year, for the first time, we have not per-
mitted computer science students to take the intro-
ductory course. The entire sequence has been re-
arranged somewhat to reflect these new develop-
ments. These actions represented an attempt to re-
turn the first course to what it originally was-
an introduction for chemical engineers. At the
same time we hoped to retain a reasonable enroll-
ment of "outside" students in the two following
courses. This hope did not grow out of any purely
altruistic motivations; rather the presence of
outside students furnished the department with a
claim on the additional teaching staff resources
necessary for us to offer such an extensive pro-
gram. Also, in a rapidly changing field such as
real-time computing, the presence of relatively
advanced computer science students in our courses
has kept the discussions lively and the lectures
more nearly "state-of-the-art." The success of
these changes is now apparent as will be noted in
the sequel. In any case, this rather lengthy descrip-

A First Course in Real-Time Computing
(3 hr. lecture and 2 hr. lab per week)

Introduction to BASIC and to real-time BASIC
Structure of real-time systems
Measurements, transducers, and signal handling
Number systems and computer arithmetic
Introduction to computer architecture and
Input/output systems: ADCs and DACs
Device controllers and device drivers

tion of the development of the real-time sequence
is intended to motivate the description of the
present courses which follows immediately.

Real-Time Computing Courses. There is no
"traditional" first course in real-time computing;
we have, after much experimentation, settled on
coverage of the topics listed in Table 4. From the
table it can be seen that we spend considerable
time on computer fundamentals; number systems
and digital arithmetic, digital logic and hardware,
computer architecture, interfacing, assembly
language programming, interrupt handling, etc.
We also spend time on some topics which have
long since been dropped from most process control
courses; measurements and measurement errors,
transduction, signal transmission, etc. In a first
course of this sort the emphasis is on single
process/single computer systems and the coverage
must, unfortunately, be light. Our purpose is to
develop a basic understanding of all the elements
in a real-time system, how these interact, .and
how they comprise the whole.
Our purpose in teaching this course has not
been to treat real-time computing as an isolated
subject area but to teach it so that the material
can be integrated into the control courses, at least
into the undergraduate process dynamics and
control laboratory. Since the introductory real-
time course is taught in Fall quarter and precedes
the two-quarter sequence in dynamics and control,
students normally are in a position to make im-
mediate application. Those students who have
elected to take the real-time course are "permitted"
to run all of their dynamics (data logging) and
control experiments using one of the real-time
computers. Although this normally requires more
work of the student-outside reading, pro-
gramming, debugging programs, etc.-our ex-
perience shows that they often take this oppor-





graduate process control program, also how the
three different groups of students-undergradu-
ate and graduate chemical engineers and "out-of-
department" (C.S., E.E., etc.) -can be accommo-
The remaining two courses in the sequence
(labeled "Real-Time Computing I and II" in
Figure 1) cover the major areas of multitask andRED


FIGURE 1. Process Dynamications, respectively, with an
emphasis on appliaomputions of computers, eitherferings.

singly or in networks, for control purposes. Tables
t5 and 6 furnish a brief description how the real-time course
contend for each of these courses; thergraduate necessarily
gradmust be procea small degree of repetition to how bring
three different groups of students-undergradu-
ate and graduate chemical engineers and "out-of-
department" (C.S., E.E., etc.)--can be accommo-

entering students up remaining to operates in the sequence
(labeled "Real-Time Computing Laboratory. The present
real-time 1) laboratory (shown in Figure 2 wmultitah one
multiprocessor applications, respectively, with an
emphasis on applications of computers, either
singly or in networks, for control purposes. Tables
5 and 6 furnish a brief description of the course
content for each of these courses; there necessarily
must be a small degree of repetition to bring
entering students up to operating speed.

Real-Time Computing Laboratory. The present
real-time laboratory (shown in Figure 2 with one

of the undergraduate process dynamics and
control experiments visible in the background)
contains three minicomputers, two of which are
configured for real-time operations. These facili-
ties, built up over the past ten years, will be sub-
stantially replaced in early 1980 by the single-
computer system shown schematically in Figure
3. This multiprogrammed system will accommo-
date up to six real-time user programs in main
memory simultaneously and, potentially, can be ex-
panded to handle many more if program swapping
using the fast disk can be tolerated. Features of
the new system will include a link with the main
campus computer, full graphics capabilities, a dial-
up facility for one remote user, and one or more
terminals in remote study rooms and laboratories.

Second Course in Real-Time Computing
(2 hr. lecture and 2 hr. lab per week)
Overview of real-time computing
Introduction to real-time FORTRAN
Analog and digital input/output
Operating systems and schedulers
Introduction to multitask programming
Multitask program design
File handling and bulk storage
Assembly language device driver routines
Multitasking applications

As part of the instructional laboratory we have
constructed several interesting auxiliary units:

* a set of input and display panels for experiments in-
volving input, output and conversion of analog and
digital quantities;
an air pressure experiment with binary inputs (solenoid-
operated valves) and outlays (pressure-operated) relays
for instruction in digital 1/0 and simple on-off control;
* a metal bar heated at one end, with eight temperature

The Real-Time
Computing Laboratory

.... .. ,.-' .. .


Third Course in Real-Time Computing
(2 hr. lecture and 2 hr. lab per week)
Real-time computers in process control
Controller and filtering algorithms
Controller design and applications
Overview of computer networks
Network architectures
Interprocessor communications
Distributed processing
Networks in process control
sensing elements located along the unheated section for
multipoint data logging studies;
a fully interfaced model railroad designed to demonstrate
the control of multiple, largely-random processes.
A list of experiments which typically would be
performed as part of the introductory real-time
course is given in Table 7. The model railroad is
used as the basis of a sequence of five experiments
in the second course. In the third course, several
of our present computers as well as the new system
will form the basis for the networking portions
of the course. The stirred-tank heating systems are
used for the process control portions. Students
completing the laboratory sequence will, as a
final project, put together a two-computer real-
time system (one computer for data acquisition
and control, the other for process operator com-
munications and report generation) with inter-
processor communications carried out over an
existing multiprocessor bus.

CHEMICAL ENGINEERS WHO plan to work closely
with digital computer control systems need a
much more fundamental exposure to real-time
systems principles than can be obtained through
a brief exposure as part of a senior-level control
course. Even a single-quarter course in real-time
computing cannot cover important advanced
topics in the field such as real-time operating
systems, multitasking, multiprogramming, and
First Course in Real-Time Computing:
Laboratory Experiments
* Calibration of a resistance thermometer for a stirred
tank heating system
* Estimation of dynamic measurement error in the
stirred tank temperature transducer
* Automated number conversions
* Digital input/output: "super pong"
* Analog input/output: simulation of a staircase ADC
* Data logging of the heated bar temperature profile
a Data logging and control of the pressure tank

... in a rapidly changing field such
as real-time computing, the presence of
relatively advanced computer science students
in our courses has kept the discussions
lively and the lectures more
nearly "state of the art."

FIGURE 3. The UCSB Real-Time Computing System.

networking. At Santa Barbara we have expanded
our offerings to a three-quarter sequence with
heavy emphasis on laboratory exercises and ex-
periments. As a service course, the sequence
attracts enough outside students to warrant aug-
mented teaching support staff from the college.
Also, chemical engineering students appear to
benefit from the experience of working with com-
puter specialists; still it is clear that mixing them
at too early a stage is not optimum. The move we
have made to restrict enrollment to chemical engi-
neers in the introductory class has eliminated most
of the problems arising from mismatches in basic
skills. This year, considerably more of our own
students elected to take the first course than have
in the past, and more of them are continuing in
the sequence. Additionally, the teaching loads over
the entire academic year have been considerably
smoothed out by closing the first course to EE and
CS students.


Before 1977-78 there was available virtually no single
source of information which could be used as a text in a
course on real-time computing. In 1977 the first volumes
of the CACHE Monograph Series in Real-Time Computing,
edited by this author, appeared. The monograph series, an
attempt to produce a definitive treatment of each major
area in the field, will consist of eight volumes initially. All
of them will be available in 1979. A listing of the titles in
the present series:
I. An Introduction to Real-Time Computing
II. Processes, Measurements, and Signal Processing
III. Introduction to Digital Arithmetic and Hardware
IV. Real-Time Digital Systems Architecture
V. Real-Time Systems Software
VI. Real-Time Applications Software
VII. Management of Real-Time Computing Facilities
VIII. Process Analysis, Data Acquisition, and Control
In 1978 a good book dealing with industrial applica-
tions of real-time computers was published: Minicomputers
in Industrial Control, T. J. Harrison (Editor), Instrument
Society of America, Pittsburgh (1978).
With respect to the laboratory facilities, the author
earlier documented the three real-time laboratory experi-
ments developed at Santa Barbara in reports, a few copies
of which are still available:
D. A. Mellichamp and F. Kayihan, The Tank Pressure Ex-
periment, UCSB Department of Chemical and Nuclear
Engineering Report C-74-1, 79 pp, (August 1974).
D. A. Mellichamp and G. P. Engelberg, The Digital Com-
puter Controlled Model Railroad, UCSB Department of
Chemical and Nuclear Engineering Report C-74-3, 119 pp,
(October 1974).
D. A. Mellichamp and T. W. Moore, The Heated Bar Ex-
periment, UCSB Department of Chemical and Nuclear
Engineering Report C-76-1, 96 pp, (March, 1976). O

book reviews

By Howard F. Rase
Wiley-Interscience, New York, 1977
Reviewed by Charles H. Ware, Jr.,
Commercialization Insights, Poughkeepsie, N.Y.

The author has written this book, as the pre-
face states, "for the professional engineer who
either daily or periodically must deal with design
or operation of chemical reactors. But in addition
to serving as a reference in the personal libraries
of professionals, it should also be useful as a text-
book for advanced design courses, including
courses taught in continuing education." It will
serve all of these purposes very well.

Volume I (772 pages) is divided into four
parts: basic data and principles of design; general
aspects of reactor design; single-phase reactors;
and design of reactors for multiphase processes.
Volume II (242) pages consists of 14 case studies
including three oxidation reactions, two polymeri-
zations, and two hydrogenations.
Part 1 is devoted to reaction rate theory and
applications; chemical and physical aspects of
catalysis and catalysts; idealized models of re-
action rates and reactor performance; and ex-
perimental methods and equipment for developing
design data. Two chapters devoted to catalysis
and catalysts provide a good summary of them
with attention to both theoretical foundations and
practical considerations. Experimental methods
and equipment to obtain chemical reaction data
free of transport effects are emphasized.
Part 2 is concerned with selection of reactor
type and mode of operation based upon yield and
safety, as well as general design considerations
such as mixing of reactants, flow distribution,
residence-time distribution within reactors, and
briefly, vessel design.
Part 3, which comprises almost half of the
text in Volume I, covers the design of CFSTRs,
tubular, batch, semi-batch, fixed-bed catalytic,
fluid-bed catalytic, and many special reactors. In
addition to the various design equations, there are
numerous drawings of actual reactors and con-
siderable attention is given to flow and heat effects,
feed systems, pressure drop, scale-up, start-up and
shutdown procedures.
Part 4 consists of an excellent chapter on gas-
liquid reactors plus a short account of liquid-liquid
reactors. In the former, stirred tanks, sparged
vessels, plate and packed columns, trickle beds, and
pipeline contractors are considered. Many theo-
retical and practical aspects are discussed: scale-
up, heat transfer, power consumption, pressure
drop, design models and procedures, hold-up, mass
transfer, dispersion, liquid distribution, and many
others. Only the agitated reactor is treated in the
last chapter.
The case studies of Volume II have been se-
lected to illustrate various types of design
problems. They are indicated in each case, often
accompanied by a comment on the principal
weakness of the design. The data that are needed
are presented, along with intermediate results,
alternatives, and bases for decisions.

Continued on page 47.


"At Du Pont you don't get lost

in a big company atmosphere.

It's very personal:

-George D. Peterson

BS, Chemical Engineering


"Du Pont is a big com-
pany but it's broken down into
satellites. So you don't get lost
in a big-company atmosphere.
It's very personal, and I think the
people are top-notch.
"I started in technical
here at the Belle Plant in West
Virginia. Now I'm a production
supervisor. Production is solv-
ing problems on a day-to-day
basis. I like working under that
kind of pressure. When things

work out, it's very rewarding. So
is working with people. I'm
responsible for helping 22 peo-
ple do their jobs:'
George was recruited by
Du Pont from the Michigan
Technological University
campus in 1973. He interviewed
about 25 companies.
George's story is typical
of many Chemical, Mechanical
and Electrical Engineers who've
chosen careers at Du Pont.

We place no limits on
the progress our engineers can
make. And we place no limits
on the contribution they can
make-to themselves, the
Company or to society.
If this sounds like your
kind of company, do what
George Peterson did. Talk to the
Du Pont representative who
visits your campus. Or write:
Du Pont Company, Room
35972, Wilmington, DE 19898.

At Du Pont...there's a world of things YOU can do something about.

An Equal Opportunity Employer. M/F

-M 3 laboratory


W. L. S. LAUKHUF and
University of Louisville
Louisville, KY 40208

N A COURSE ON ADVANCED process control a sub-
stantial portion of the time is spent in discussing
the fundamentals, design, and implementation of
advanced control concepts. When the course was
first offered several years ago, computer simula-
tions were used to demonstrate the concepts. While
simulation is certainly a very valuable tool in the
analysis and design of control systems, the
students felt that it would have been much more
satisfying if they had a physical process to work
with. In subsequent years, several laboratory ex-
periments were developed to eliminate this de-
The equipment for the process, around which
the present experiments were developed, was con-
structed from data provided by Exxon Oil
Company (then Humble Oil & Refining Co.) on an
identical setup at their Bayway refinery. [1] The
rig was used by Exxon to train their instrument
and process personnel. It has four of the most

FIGURE 1. Schematic of Process Control System (Arrows
indicate Signal transmission between the process and
the computer).

It has four of the most
commonly encountered control
loops in process industry, i.e., liquid-level,
flow, pressure, and temperature.

commonly encountered control loops in process
industry, i.e., liquid-level, flow, pressure and
temperature. The equipment was used to demon-
strate feedback control concepts for these loops.
Additional instrumentation has been added to the
apparatus at the University of Louisville in order
to demonstrate advanced control concepts.

A schematic of the thermal process unit is
shown in Figure 1. The process involves heating
of a continuous stream of water by steam. A
vertical cylindrical tank approximately one foot
in diameter is located in the center of the unit.
The tank contains a steam pipe in the form of a
vertical U tube. Water flows continuously in and
out of the tank where it is heated by steam.
As shown in Figure 1, the process is instru-
mented with conventional controllers as well as
with computer control hardware. Three variables
can be controlled in this process: the flow rate of
water into the tank, the level of water in the tank,
and the temperature of water in the tank.

This loop regulates the flow of cold water into
the tank. Supply water passes through a 7/16-
inch diameter orifice mounted in a 1/2-inch pipe,
then through a 1/2-inch control valve made by
Uniflow Valve Corporation, and into the top of the
tank. The differential pressure across the orifice
is transmitted to a mercury manometer (FI in
Figure 1) and to a Honeywell flow indicating
transmitter (FT). The pneumatic 3-15 psig out-
put of the transmitter is fed to a flow recording
controller (FRC). It is also fed to an AMTEK
pneumatic to voltage (P/E) transducer. The
electrical output of the P/E transducer is con-


Copyright ChE Division, ASEE, 1980

nected to one of the analog-to-digital (A/D) con-
verter channels of the control computer. As indi-
cated in Figure 1, the position of a Foxboro air-
switch determines whether the transmitter output
is fed to the conventional controller or to the
control computer.
The conventional flow recording controller is
a Honeywell, proportional + reset type, controller
which sends a signal to an "air-to-open" control
valve on the process unit. Alternately, the signal
to the control valve may also come from one of the
digital-to-analog converter channels on the control
computer, via a Fisher E/P transducer. Again,
the position of an air switch determines whether
the signal to the valve comes from the conventional
controller or from the control computer.


Water level in the tank is controlled by
manipulating the flow of water out of the tank.
The level sensor infers the liquid level by measur-
ing the pressure required to cause air bubbles to
form slowly at the bottom of the tank. This pres-
sure signal is fed into the high pressure side of a

Pradeep B. Deshpande is associate professor of ChE at the Uni-
versity of Louisville. Prior to coming to Louisville, he was with
Bechtel, Inc., at San Francisco, CA. He has served as a consultant to
Mobil Exploration Norway, Inc., and to other companies in the areas of
control systems design and simulation. He has a Ph.D. in ChE from
the University of Arkansas and is a registered control systems engi-
neer in California. (L)
Walden L. S. Laukhuf is an associate professor of ChE at the Uni-
versity of Louisville. Prior to coming to the University, he was a
Captain in the Air Force at the Air Force Materials Laboratory in
Dayton, OH. He has a BChE, MSChE and a PhD in ChE from the
University of Louisville and is a registered professional engineer in
Kentucky. (C)
Nandkishor G. Patke is presently working on a Ph.D. in ChE at
the University of Louisville. His research interests are process model-
ing, simulation and control. He has a B.Tech. in ChE from the Indian
Institute of Technology, Kanpur, India. (R)

Load, L(s)
load transfer
steam GI'5l' function
I- -vove process
poantt --[- lt[).--- Go C temperature
L- -_ .. J__

FIGURE 2. Block Diagram of the Temperature Control

Foxboro differential pressure transmitter (LLT),
set at a range of 40 inches of water. The low
pressure side of the transmitter is vented to the
atmosphere as is the surface of the liquid in the
tank. Thus, the differential pressure transmitter
output is proportional to the liquid level. The
signal from the transmitter is fed to a Honeywell
proportional + reset controller (LLRC) and to
one of the A/D converter channels via an air
switch which determines whether the loop will be
on conventional control or on computer control.
The outputs of the controller and a D/A con-
verter channel are fed to an air switch and then
to a 3/4-inch, "air-to-close" control valve made by
the Uniflow Valve Corporation, installed in the
drain line from the tank. The air switch selects
computer control or conventional control. A 1/4-
hp, Barray pump in this line insures sufficient fluid
pressure on the upstream side of the valve.


The temperature of water near the bottom of
the tank is measured by an iron-constantan
thermocouple immersed in an oil-filled well ex-
tending into the bottom portion of the tank. The
voltage produced by the thermocouple is converted
by a Honeywell electropneumatic transducer (TT)

. Ll








0 4.8 8.8 12.8 16.8

FIGURE 3. Input/Output Records From Pulse Test

into a pneumatic signal. This air signal is fed to a
Foxboro three-mode controller (TRC). When con-
ducting cascade control experiments, this con-
troller serves as the master controller. The trans-
mitter output is also fed to an A/D converter
channel via an air switch. The output of the three-
mode controller is fed to the set-point input of the
Honeywell, proportional + reset, pressure record-
ing controller (PRC). In cascade control experi-
ments PRC serves as the slave controller.
The coil-side steam pressure is fed to a Honey-
well transmitter. The output of the transmitter
is fed to the pressure controller. The output of the
controller operates a 1/2-in. Uniflow pressure
control valve. The signal to the valve may alter-
nately come from a D/A converter channel of the
control computer.
In conventional control experiments, cascade
control is achieved if both, master and slave con-
trollers, are placed in automatic. If the pressure
(slave) controller is switched to manual, the in-
put to the control valve comes from the tempera-
ture controller. The temperature control loop is
then a simple closed-loop rather than a cascade
The control computer used in some of the ex-

FIGURE 4. Frequency Response Diagram
Frequency co, Radians/min.

periments is a PDP 1103 microcomputer system
manufactured by the Digital Equipment Corpora-
tion. It has 24K words of memory and is equipped
with an 8-channel D/A converter and a 16-channel
A/D converter. The computer comes with a dual
disk drive. A floppy disk, containing systems pro-
grams (e.g. Fortran support programs, real-time
subroutines) resides in one of the drives while a
second floppy disk, containing user-developed
control programs, resides in the other drive. Com-
munication with the computer is via a teletype-
writer (LA 36 DECWRITER).

EXPERIMENT 1: Process Identification
This experiment is concerned with dynamic
identification of an open-loop process by pulse test-
ing. The resulting information is used to find (1)
suitable tuning constants for a feedback controller
or (2) to develop an approximate process model
which is useful in designing advanced control
strategies. The pulse testing technique [2, 3] has
been applied to the temperature control loop whose
block diagram is shown in Figure 2.
The input and output records from the pulse
test are shown in Figure 3. Numerous data points
from these records are entered into a computer
program [3, 4] which generates frequency response
data as shown in Figure 4.
From Figure 4, the ultimate AR, which refers
to the amplitude ratio for which the phase lag
equals 180 degrees, is 0.0615. Also, the crossover
frequency, which is the frequency corresponding
to the phase lag of 180 degrees, is 1.1 radians
per minute. Therefore, the ultimate gain, Ku, and
the ultimate period, Pu, are

Ku =

16.23 psi/F

Pu = = 5.71 min.
Since the gain of the transmitter, K,, is 0.06
psi/F, the Ziegler-Nichols tuning constants for a
PI controller are

Gain, Ke = 0.45 Ku/KT = (0.45) (16.23)/0.06
= 121 psi/psi
Integral Time, 7T = Pu/1.2 = 5.71/1.2
= 4.75 min. (2)

To assess the adequacy of the controller settings
found in this section, a closed-loop control experi-
ment was conducted. The response of the system
to a step change in set point and load is shown in


Figure 5. This plot shows that the tuning
constants found through pulse testing are ade-

EXPERIMENT 2: Multivariable Control
Most large processes have many controlled
variables and many manipulated variables. Ideally,
a change in a given manipulated variable should
affect only its own controlled variables and no
others. Unfortunately, in many cases, this is not
the case. The interaction among different loops can
lead to poor control and even instability.
Since interaction can be a problem in multi-
variable control systems, it is important to know
the extent of interaction and to be able to develop
criteria for proper pairing of manipulated and
controlled variables.
A measure of the extent of interaction in multi-
variable control is obtained by Bristol's method
[5]. The method is based on steady-state input-out-
put relationships for the process. It yields a
measure of steady-state gain between a given
input-output pairing. By using the most sensitive
input-output connections, interaction is mini-
Since Bristol's method does not take systems


S1 -

0 4 8 12 16
FIGURE 5. Transient Closed-Loop Response to (a) Set
Point Change (b) Load Change

dynamics into account, it would be very useful to
evolve an experiment which assesses the beneficial
effects of proper pairing upon the dynamic re-
sponse of the multivariable system. The present
experiment [6] is designed to accomplish this ob-
The hardware for this experiment is essentially
that shown in Figure 1 with the exception that
the steam line is replaced by a pipe which intro-
duces hot water into the tank. The air switches
must be in the computer control position for this

Since interaction can be a
problem in multivariable control systems,
it is important to know the extent of interaction
and to be able to develop criteria for
proper pairing of manipulated
and controlled variables.

The process objective is to control the level (in
effect, total flow) and temperature of water in
the tank. There are two inputs to the process,
namely, the flow of cold water and the flow of hot
water into the tank. So, the controlled variables
are temperature and total flow and the manipu-
lated variables are cold water flow rate and hot
water flow rate. The question is, should the
temperature be controlled by manipulating hot
water flow and level (i.e. total flow) by cold water
flow or vice versa? Bristol's method provides the

Bristol's Relative Gains Analysis
The functional steady-state relationship be-
tween temperature, total flow and the flow
streams is

T = f(m, m,) = (meT + mhTh) /mt

mt = f(me, mh) = m + in

Around some steady-state operating
relationships can be expressed as

AT = Am + TAm,
am- Ambh
= K, Am, + K2lAm,

point, these

Amt A-m e + Am a Amn

= K21 Ame + K2,2Amh
The K's are the open-loop steady-state gains which
quantitatively describe how the m's affect T and
mt. They can be determined from a mathematical
model of the process or by experimental step or
pulse-testing on the plant. To evaluate K1l and
K21 for example, a small change in the flow of cold
water is made, while the process is operating
under steady state conditions (under manual
control with the flow of hot water maintained
constant). When the temperature and level reach
their new steady-state values, K11 and K21 can be
evaluated by
Ki1 Am mh constant (5)


K21 = l( -T
K (6)
\ Ari ) h = constant (
The gain K,:, then, determines the change in
temperature, T, due to a change in me when mh
is held constant. Now, suppose instead of holding
m, constant, while a small change in me is being
made, mh is manipulated so as to bring mt back to
the original value it had before the change in m,
was made. Then, another gain Anl can be defined

An -A
AI A(me )mt = constant (7)

An, is a measure of how me affects temperature T,
if level were under closed-loop control (i.e. held
constant). The ratio of Ku, to An is called the
relative gain X,,. Thus,
K11 ('AT/Ame) h = constant
S All (AT/Ame)mt = constant
By comparing the relative gains for each manipu-
lated variable, it is possible to assess which m
has the most effect on a given controlled variable

The equipment for the process,
around which the present experiments
were developed, was constructed from data
provided by Exxon Oil Company... on an
identical setup at their Bayway refinery.

and therefore how to pair the manipulated and
the controlled variables.
While K's can be determined easily, the experi-
mental determination of A's is not so easy. How-
ever, they can be evaluated from the K's as
By definition

A,, = (AT
\ Am, = constant

The open-loop relationships (Equation
Am = = = K21Am, + K22Amh

Amh K -- Am,
Also in view of Equation (4)
AT = KnAm, K Am,

S- Incorrect pairing

time (minutes)
FIGURE 6. Transient Response of Level



AT = KliK22 K1,K Ame
K22 m

SA t constant
HAmm = constant


KxiK22 K12K21

The relative gain XL is then

KA, KlIK22
All ;KliK22 K12K21


Similar analysis yields the remaining relative
gains. Thus,

S K12K21
K12 K12K21 KlnK22
S K12K21
2 12K21 Kll K22
2__2 K11K22
-2 11K22 K1K




(4) be- To facilitate the pairing of manipulated and
controlled variables, it is convenient to present the
relative gains in a matrix form as shown in Equa-
9 tion (17).

min mh
T X, 112
mt A21 A22


For each controlled variable, the manipulated
variable selected is the one which has the largest
positive relative gain. Since a property of this


matrix is that each row and column sums to one,
only one X need by explicitly computed in a 2 x 2


The relative gains matrix for the current pro-
cess is shown in Equation (18).

me mh
T me m__
mnmt mt
It mh me
Smt nTt

me mi

T 0.172 '0.828 (18)

mt 0.828 0.172

This equation shows that: T should be controlled
by manipulating mh and mt by manipulating me.
Both loops use a proportional + integral control
algorithm on the digital computer as the control
element. The algorithm was tuned by trial and

interaction ("fighting loops") would have been a
problem, particularly if the response times of the
two loops were comparable. Severe cross-coupling
can drive the multivariable system to instability.
In such cases decoupling will be required. Inter-
ested readers may consult reference 7 to obtain
further information on the various techniques
currently available for decoupling a multivariable
control system. O





amplitude ratio
closed-loop gains
process transfer function
temperature transmitter gain, psi/F
proportional gain on temperature controller,
steady-state gain of process, F/psi
open-loop gains
ultimate gain, psi/F
cold water flow, lb/hr
hot water flow, lb/hr
total flow m, + mn, lb/hr
ultimate period, min.
temperature of the mixture, F
temperature of cold water, F
temperature of hot water, oF

phase angle
process dead-time, minutes
time constant, minutes
integral time, minutes
relative gain
frequency, radians/minute

10 20 30 40
time (minutes)
FIGURE 7. Transient Response of Temperature

error. The steady-state operating conditions were:
level set point, 50 % (which corresponded to total
outlet flow of 11.6 lit/min) ; temperature set
point, 24.4C; cold water flow, 9.61 lit/min; hot
water flow, 1.99 lit/min. The process was operated
with correct pairing as well as with incorrect
pairing. The benefits of proper pairing are clearly
evident in the set-point responses shown in
Figures 6 and 7. These results show that Bristol's
approach is a simple and powerful tool in the
control systems design of multivariable processes.
If the relative gains in Equation (18) had
turned out to be numerically close to each other,

1. Alper, William S., A Laboratory Demonstration of
Closed-loop Automatic Process Control, Master of
Chemical Engineering Thesis, University of Louisville,
2. Hougen, Joel 0., Experiences and Experiments with
Process Dynamics, Chemical Engineering Progress
Monograph Series, Vol. 60, No. 4, 1964.
3. Luyben, W. L., Process Modeling, Simulation and
Control for Chemical Engineers, McGraw-Hill Book
Co., New York, NY, 1973.
4. Dynamic Response Testing of Process Control Instru-
mentation, ISA-S26 Standard, Instrument Society of
America, 400 Stanwix Street, Pittsburgh, PA 15222,
October 1968.
5. Bristol, E. H., On a New Measure of Interaction for
Multivariable Process Control, Trans. IEEE, 1966.
6. Knabel, E. A., Multi Variable Control System for
Fluidized Bed Coal-gasification Units, Master of Engi-
neering Thesis, University of Louisville, 1978.
7. Foss, A. S., Denn, M. M. Ed., Chemical Process Control,
A.I.Ch.E. Symposium Series, No. 159, Vol. 72, 1976.






University of Wisconsin
Madison, Wisconsin 53706

P ROCESS CONTROL FOR undergraduates is offered
each semester and has enrollments of 30 to 50
students. The course has two lecture periods, one
recitation period, and one 3 hour laboratory period
each week. The curriculum (shown in Tables 1
and 2) has been selected to give the student a
balanced mixture of useful theory and hands-on
practical experience in process dynamics, measure-
ment, and control.


puter system described in Part I of this article
has allowed a complete restructuring of the course
material. A large library of computer programs
for the design of control systems is available and
is still growing. The use of these programs makes
it possible to design control systems for meaning-
ful practical processes without the drudgery of
laborious hand calculations. Thus, course time is
freed and it becomes possible to cover topics
generally neglected in undergraduate courses,
Undergraduate Process Control Lecture Topics
1. Review of Laplace transforms and matrix algebra
2. Principles of real-time computation and data acquisi-
3. Transient and frequency response of linear systems
4. Feedback control of linear systems
5. Stability of linear systems
6. Control system design for linear systems
7. Nonlinear systems
8. Case studies

*Part I dealing with graduate education in process
control appeared in the Fall 1979 issue of CEE.

Undergraduate Process Control Laboratory Experiments
1. Techniques of analog simulation
2. Techniques of digital simulation
3. Dynamics of interconnected water tanks
4. Computer aided data acquisition
5. Frequency response and process identification through
pulse testing
6. Calibration and dynamic response of PID controllers
7. Feed forward, feedback, and cascade control
8. Multivariable control of a gas distribution system
9. Multivariable control of a multi-sidestream distilla-
tion column
10. Tuning of a level controller with strong system non-
e.g. multivariable control. The lecture material is
listed in Table 1 and includes considerations of
how to choose loop pairings, how to minimize
interactions between control loops and how to tune
multivariable systems. In the latter part'pf the se-
mester a number of graphical interactive com-
puter aided design programs are used for detailed
case studies. The present library includes routines
for the generation of Bode plots, root loci and

I) G S)=CtiPltS'I 'P2*tS+l)-T3tS+I)(T4*S+)(XT5tS+I)
OR ,
-2) G(S)[>= I )+A tS+ ....A(N)tSI*-H- > I ) B( I )B(2)S+.....B(M)tS*St(M-I)
GC,.S = t(l TOSS 1/TItS)
INPUT C = 1 1) P 2) PD 3) PI 4) PID
FIGURE 1. Input Data for Root Locus Program: Process
(s + 1)
G(s) = is under Propor-
(2s + 1).(8s + 1))(5s + 1) is under rop
tional Feedback Control.
Copyright ChE Division, ASEE, 1980


Nyquist diagrams for open loop, closed loop and
cascade control systems. In addition, a number of
programs for the design of multivariable systems
are presently available. Output from these pro-
grams usually appears as plots drawn on the
screens of graphic terminals, and paper copies (to
be included in student reports) are obtained by
the student at the push of a button. Example: if
a root locus diagram is to be drawn the user
would be asked to specify the transfer function
parameters and other variables as shown in Fig.
1. Upon completion of the questions a diagram (as
in Fig. 2) will appear which can be subsequently
enlarged or otherwise modified.
The laboratory, which is designed to comple-
ment the lecture material, is comprised of some




Manfred Morari was born in Graz, Austria on May 13, 1951. He
obtained his undergraduate education in chemical engineering at the
Swiss Federal Institute of Technology (ETH), Zurich. After his diploma
he started graduate school at the University of Minnesota in 1975.
Upon completion of his doctorate he joined the ChE faculty at the
University of Wisconsin in 1977 where he is currently assistant pro-
fessor. Last summer he worked for Exxon Research and Engineering
Company. His research interests include a variety of topics from the
areas of process synthesis and process control: synthesis of separa-
tion sequences, optimal measurement selection and inferential control,
optimizing control and the dynamics and control of large integrated
processing systems. (L)

W. Harmon Ray was born in Washington, D.C., on April 4, 1940.
He received the B.A. and B.S. Ch.E. degrees from Rice University,
Houston, Texas, in 1962 and 1963 respectively, and the Ph.D. degree
in ChE from the University of Minnesota in 1966. He has been on
the faculty of the University of Waterloo in Canada (1966-70), the
State University of New York at Buffalo (1970-76), and the Uni-
versity of Wisconsin, Madison, where he is presently Professor of
ChE. During the 1973-74 academic year, he was on sabbatical leave as
a Guggenheim Fellow in Belgium and Germany. His research in-
terests include chemical reactor engineering and process modelling,
optimization, and control. His publications include an edited volume
"Distributed Parameter Systems" (Dekker, 1977), and two monographs
"Process Optimization" (Wiley, 1973) and "Advanced Process Control"
to be published by McGraw-Hill in 1980. (R)

The use of these programs makes
it possible to design control systems for
meaningful practical processes without the drudgery
of laborious hand calculations. Thus, course
time is freed and it becomes possible to
cover topics generally neglected
in undergraduate courses

ten experiments (cf Table 2). Most of these ex-
periments are carried out by each laboratory
group in the course of the semester. Many experi-
ments involve real time computation and are se-
lected to familiarize the students with the modern
methods of implementing control algorithms.
These presently include:
Data acquisition (noise suppression, signal amplifica-
tion, A/D conversion, sensor calibration, etc.)
Pulse testing (data acquisition, input pulse selection,
Fourier transformation of data, frequency spectrum
analysis, frequency response parameter determination,
Multivariable feedback control of interconnected gas
storage tanks (process modelling, data acquisition,
single loop PI control, supervisory computer control,
direct digital control, etc.)
Multivariable feedback control of a multi-side-stream
distillation column (process modelling, data acquisition,
single loop control, supervisory computer control, and
direct digital control)
Let us discuss two of these experiments in more

Pulse Testing

measured pulse of hot water into a stirred
mixing tank having continuous inflow and out-
flow. Input and output temperatures are measured
under computer control and the resulting data
analyzed to provide frequency response informa-
-6eee6eee6e6e6eee66 es6e6asea ROOT LOCUS eeePeet eepeleleetett
P= 6 6O P2= 1. T3i 2 68 TINE DELATY 0.00
T4= 666 T5= 5668 C- 16, 0.
TDO= 0.@ I/TI= 8.6e K= 8.06 0 446E-06
K ( P )
A= e.41
8= 2 45
C' 4 59
6 72
E= 9.92

OC a A


-8 333E.09

FIGURE 2. Root Locus Diagram for the
Control Loop in Figure 1.

e ee6E+*e

a8.earEBB -. 446E+B9



tion and parameters for a process model (i.e., a
gain and time constant for this simple first order
process). Typical results, taken from a student
lab report, are shown in Figures 3 and 4. The
measured input and output temperatures are
shown in Figures 3 while the resulting Bode plot
showing the frequency response may be seen in
Figure 4. The process gain of 1.0 is readily found
from the low frequency asymptote of the ampli-
tude ratio (AR). By using both amplitude ratio
(AR) and phase angle (0) to estimate the corner
frequency, w two separate estimates of the tank
time constant are found. Usually these are in
reasonable agreement with the "theoretical" value
determined from the mean residence time of the

Multivariable Control of Interacting Gas Storage Tanks

One of the most sophisticated experiments
carried out by the students is the modelling and
multivariable feedback control of a pair of inter-

'T l'r r r T n Tr T n PULSE RESPONSE *t *t*S***lrtutt

0 12E+03 02
e. 1 +03
Temp. tF)
0.-0E+ T lnt

a 6WME+02

O.E8MS+-3 0.531E+G3

*tT lttW* *tt itttrttltl* BODE PLOT



. 346Ea a

-0.SE=+02 -9o-
8.52 E-82

.15E-1) .C 8 o.53 1os
u(sec~~ ) 05

FIGURE 4. Frequency Response Bode Plot for Mixing

fice, a rotameter, and is vented. The equipment is
fully instrumented with two pressure gauges, pres-
sure transducers, PI analog controllers and is also
interfaced with the minicomputer allowing data
acquisition, supervisory and direct digital control.
The first task given the students is to develop
a mathematical model for the tank system. An
unsteady state mass balance for each of the two
tanks yields

dp1 RT
dt V= [CdlAif(Popi) -Cd2A21(P1,P2)] (1)

dpC RT
dpt- = T_[Cd2A Z(PP~1P) -CdsA, (P2,P3)] (2)
dt V.M




R = universal gas constant
T absolute temperature
Vi = volume of tanki
M = mean molecular mass of air stream
Cdi discharge coefficient for orifice i
Ai area of orifice i

FIGURE 3. Pulse Test Data for Mixing Tank.

acting gas storage tanks. This experiment requires
three laboratory periods plus some lecture prepa-
ration. The purpose of this experiment is to
demonstrate to the student the effects of inter-
actions in multivariable systems and to give him
or her the possibility of testing different multi-
variable control schemes on a real system.
A simplified version of the system flow sheet
is given in Figure 5. Air enters the system at a
constant pressure of 60 psig, flows through a
control valve into the first tank and from there
through another control valve into the second
tank. Finally, the air passes through a fixed ori-

K, (Pi(Pi- Pi+))1/2 P+, /PI > .5 (3)
Kpi pi+,/pi < .5 (4)

KI,K2 = material constants

All parameters of the model are available to

FIGURE 5. An Interacting Gas Storage System.


the student in tabulated form except the discharge
coefficients which have to be determined through
steady state experiments.
Computer control experiments are carried out
with the goal of achieving a given gas production
rate while meeting certain pressure constraints in
the two gas storage tanks. Both Supervisory
Control and Direct Digital Control algorithms are
tested by the student. Different control objectives
can be selected by the student but they all result
in the regulation of the two pressures through
changes in the two control valves. Let us briefly
indicate some of the choices available to the

A. Supervisory control:
Possible control objectives:
1) specified gas flow rate from tank 2 and
2) p1/P2 fixed or p, minimized or p, maximized
In supervisory mode, the valves are under
local analog control. After a control option is

FIGURE 6. Control Structure for DDC Control with
Single Loop PI Controllers and with Added Steady State
Decoupling (dashed lines).

entered by the student via the computer terminal,
the set points are computed and transmitted by
the computer to the local controllers. The response
to changes in objectives is observed for different
flow regimes. (Critical or subcritical flow through
the valves.) Set point compensation is attempted
to yield a smoother servo behavior.

B. Direct digital control (DDC):
The possible control objectives are identical to
those listed in part A. Different multivariable
control algorithms are developed by the students
and supplied to the main control program in the
form of Fortran subroutines. As an example,
steady state decoupling is implemented and com-
pared with the usual single loop PI control. The
controller structure is seen in Figure 6. The re-
sults of one laboratory group are shown in Figures

PRORF = 90.8, PPA9 I0 = 1.1
I=PI 2=2, 3=CVI, D 2 r5FPODR
1*. .-,-r*T .' ]
2 O ,:,.; -' *.

e! le" e-._ ..

e eE
a eeE.$1 8 gmll*1

I 171**13

FIGURE 7. Process Response Under DDC With Single
Input-Single Output PI Control.

7, 8. With simple PI control, significant oscilla-
tions in the pressure response were found (cf.
Figure 7). However, with the addition of steady
state decoupling, the response was much improved
(Figure 8).


T HE NEW MINICOMPUTER has become an integral
part of the undergraduate control course at
Wisconsin. Aspects of digital computer control are
demonstrated to the students and they have the
opportunity to gain some practical experience with
the implementation and application of modern
control algorithms. Computer aided control

FROCE = 0 00a. PRATIO 1.1

1 ',.'.'PO E .,:

0.18E+0e1 e.141E*3 1 28*II8
FIGURE 8. Process Response Under DDC With Steady
State Decoupling and PI Control.


system design methods utilizing interactive
graphics have replaced classic pencil and paper
methods and have thus made time available to
include new theoretical material in the curricu-
lum. O

Our progress in bringing real time computing into the
process control curriculum at Wisconsin is due to the co-
operative efforts of many individuals:
1. Emeritus Professor R. J. Altpeter, who originally
established process control as a discipline at Wisconsin.
He laid the foundation upon which the present cur-
riculum is built.
2. Visiting Professor Ram Lavie, who shared his ex-
perience in the development of laboratory experiments.
3. The students who contributed their time and talents
to the development of new experiments and computer
aided design programs-these include Dennis Arnon,
Dean Berceau, John Bolling, John Greiner, Tim Heisel,
Sunny Lo, Bob Lojek, Diana Meseck, David Roark,
John Seymour, and Pat Vilbrandt.
4. The technical staff and faculty of the department of
Chemical Engineering who should be recognized for
the support they have given this endeavor. In par-
ticular, the efforts of Mike Lynch, Todd Ninman, Jim
Wenz and Don Zentner have been invaluable.
5. The more than 200 undergraduate and graduate
students who have "consumer tested" the changes in
curriculum and provided useful feedback.

Ever been in the midst of research and realized that
easy access to U.S. Patents would be the answer to
your problems? U.S. Patents on microfilm from
Research Publications, Inc. offers to attorneys,
researchers, inventors, and librarians the largest
single body of scientific and technical information
in existence. RPI offers a complete retrospective
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as the Official Gazette and the CDR File. Access is
immediate, and information retrieval is quick and
easy. Delivery of current subscriptions is weekly,
within four weeks of date of issue. Find the answers
to your questions with U.S. Patents on microfilm

research publications, inc.
12 Lunar Drive, Woodbridge, Ct 06525 (203) 397-2600





Nominations and applications are invited
for the position of Associate Dean at The
Institute of Paper Chemistry.

The Associate Dean is Director of Ad-
missions and chairs the Admissions Com-
mittee. This includes responsibility for the
recruitment and evaluation of prospective
graduate students.
The Associate Dean also works closely
with the Dean in administering the gradu-
ate programs at the Institute, assists in the
development and implementation of aca-
demic policy and shares responsibility for
the management of the Dean's Office.
The Associate Dean reports directly to
the Vice President-Academic Affairs/Dean of
the Institute. The Dean's Office has re-
sponsibility for faculty planning, student re-
search, admissions, financial aid, student
records, advisement, placement, continuing
education, alumni affairs and the computer
The position includes an appointment on
the faculty which affords graduate teach-
ing and research opportunities.

Letters of application, with credentials,
should be sent by April 1, 1980 to:

Harry T. Cullinan, Jr.
Vice President-Academic Affairs & Dean
Institute of Paper Chemistry
P. O. Box 1039
Appleton, WI 54912

The Institute is an equal opportunity, affirmative
action employer.


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and the Leading Texts
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Separation Processes
C. Judson King, University of California at
1979, 880 pages (tent.), $27.95 (tent.)
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coverage of separation processes, with material
organized by concept. The common features and
key differences between processes are
emphasized, and many worked examples,
problems, and case studies are included. Solutions
Available Now

Mass Transfer
The late Robert E. Treybal
1980, 800 pages (tent.), $26.50 (tent.)
A thorough, highly acclaimed study of
.mass-transfer operations in chemical
" engineering, this book covers relevant
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This book is primarily devoted to a study of
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1980, 992 pages (tent.), $28.50 (tent.)
In this book, economic principles are applied to
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Clarkson College of Technology
Potsdam, N.Y. 13676
THE LEVEL CONTROL mechanism in the home
toilet tank is a nonlinear, proportional control
system that illustrates various process control
concepts. It can also serve as an introduction to
data acquisition, process analysis, and model de-
velopment. This simple experiment can be de-
veloped as an example problem, a classroom
demonstration, or a laboratory exercise.


A TYPICAL TOILET TANK is shown in Figure 1.
The level control system regulates the tank
water level C at the desired steady state C, by
manipulating the inlet water rate M to compen-
sate for the disturbance (the flushing rate U).
The control logic is given in the flow diagram of
Figure 2A.
An actual toilet tank can be used for the labora-
tory exercise if a flowmeter is installed in the feed
line and a measuring scale is fastened to the in-
side of the tank wall. For classroom demonstra-
tions, the level mechanism can be installed in a
clear plastic tank (0.5 by 0.15 by 0.4 meters high).
A quick-opening valve can provide the necessary
flush for the plastic tank.

Tom Ward has been on the chemical engineering faculty at Clarkson
College of Technology for many years. He received his M.S. from
the University of Texas and his Ph.D. from RPI. His research interests
are principally in the area of process control.

FIGURE 1. A typical tank.

Typical exercises involve the development of
analytical models, determination of model pa-
rameters, and measurement of the closed-loop re-
sponse to a flushing disturbance. Two suitable
process models are presented in the following

THE EQUATIONS FOR EACH of the elements of
Figure 2A can be obtained as follows:
Tank: A mass balance on the tank gives
A = M- U (1)

0 ~ E

FIGURE 2. Information flow diagrams: A. Nonlinear
logic, B. Linear block diagram.


Copyright ChE Division, ASEE, 1980

where A is the tank cross-sectional area. A typical
value for A is suggested by the plastic tank dimen-
sions given above so that
Tank: A mass balance on the tank gives
A = (0.5) (0.15) = 0.0752 (2)
Float: The float center height B is assumed to
correspond to the water level so that the equation
for the measuring element is simply
B = C (3)
Alternately, it could be assumed that the float is
characterized by a first or second order model.
While this would lead to an interesting higher-
order process model, it might be difficult for
students to estimate the parameters in a higher-
order model.
Valve: It is assumed that the valve flow rate
M can be related to the valve position M' by the
M = a (M')o.5 (4)
Many toilet valves have an adjustable ring so that
the valve coefficient can be changed. A typical
value for the coefficient a is 0.00212.5/s. The
experimental determination of a suitable valve
equation and coefficient can provide an interest-
ing short study.
Lever: A reasonable controller equation relat-
ing the valve position M' to the error (C, B)
can be written as
M'= K (C B) (5)
where the controller gain K is given by the lever
ratio. A typical value for the desired steady-state
level C. is assumed to be 0.3 meters. If the lever
is assumed to be 0.40 meters long (to the float
center) and the pivot is 0.04 meters from the
valve end, then the controller gain is given as
K = 0.04/0.40 = 0.1 (6)
These can be combined to give the nonlinear model

A dt a[K(C -C)]0.-5-U

dC ^ ^
Tank: A = M U
Float: E = -B = -6
Lever: M' = KE


The nonlinear valve equation can be linearized
around the steady state by the truncated Taylor
series approach to give

A IdM ^ A A
MM ( 1dM ,' iM'


where p should be the slope of the valve curve at
the origin. As can be seen in Figure 3, this would


M 0.0002



S0.01 SLOPE 0.02 0.3m

0 0.1 0.02 0.03

FIGURE 3. Linearization of valve response.

give a value of p that would be much too high
away from the origin. A line with slope p =
0.0159 is arbitrarily selected to approxi-
mate the value behavior over the region of
interest. This illustrates how experimental data
can be used to improve on the classical steady-
state linearization.
The linear model corresponds to the block
diagram of Figure 2B, where G, = K, G, = P,
H = 1, Gp = 1/AD, and D = d/dt. These can be
combined to give the linear model as

(TD + 1)C = -aU
where T = A/P/K and y = 1/pK.


A S NOTED ABOVE, the steady state is selected as
the filled tank (a nonflow condition). For any
variable X, the perturbation from the steady
state is defined as X = X X,. In terms of such
perturbation variables, the equations for three of
the elements are

T IS ASSUMED THAT the flush, given by SUdt,
empties the tank. Then JUdt = (0.5) (0.15)
(0.3) = 0.0225 3. Various approximations
can be suggested for the disturbance U. A suit-
able function might be the displaced cosinusoid
with a period of 10 seconds


S= -0.00225 cos 0.27rt + 0.00225

0 t>10 sec (13
Since the flush occurs quickly compared to the
filling time, it might be reasonable to approximate
the disturbance as an impulse of 0.0225
occurring at t = 0.


turbance forms can be compared with experi-
mental responses to show the significance of the
approximations made. Three model responses will
be given here:
a. Nonlinear Model With Cosinusoid Dis-
turbance. The response for this case was obtained
numerically for the parameter values assumed
above. This is given by the curves NL-C in Figure
b. Nonlinear Model With Impulse Dis-
turbance. If the flush is an impulse at t = 0,
then the solution for t>0 can be obtained by
assuming that U = 0 and C = 0 at the instant
t = 0+. Equation 7 can then be solved by the sepa-
ration of variables technique to give
(C,- C)--5/2A)t + C1 (14)
For the assumed parameter values, the integra-
tion constant C1 = (0.3)0.5. The response curves
for this case are given as NL-I in Figure 4.
c. Linear Model With Impulse Disturbance.
If it is assumed that U(0+) = 0 and C(0+) =
-0.3, then the solution to Equation 12 is

C = -0.3 e-
C -= 0.3 e-t/T


The responses for this case are shown in Figure
4 as the curves LI.


T HE TOILET TANK CAN be used to illustrate other
process control concepts. Some of these are:
a. Offset. The leaking toilet provides one of
the simplest demonstrations of offset. If the out-
flow at steady-state is not zero, then the inflow at
steady state is not zero. Since the flow into the
tank is a fixed function of C, then the steady-state
level must decrease if the toilet tank is leaking.
b. Measurement Error. The water-logged
float implies that the float center-line does not



TIME (s)
FIGURE 4. Level and flow responses (LI = linear model
with impulse disturbance, NL-I = non-
linear model with impulse disturbance,
NL-C = nonlinear model with cosinusoid

correspond to the level. At steady state, the level
must increase in order to close the feed valve.
c. Setpoint Changes. The float end of the
level can be bent to represent setpoint changes.
d. Controller Gain. Most toilet tank controls
have some provision for changing the loop gain.
In some cases, this is accomplished by changing
the effective lever ratio. In others, an adjustable
ring is used to change the valve gain.

The toilet tank, as either a classroom problem
or experiment, provides a simple introduction to
process control. D


rec.og.niL tion\, rek-ig-'nish-an,
-og-\ n 1 : the action of recognizing; the state of being
recognized; as a : ACKNOWLEDGMENT 2 : special notice
or attention.\ as we see it\
1 : the primary motivation to do creative work for an out-
standing company 2 : ACKNOWLEDGMENT of the quality of
that work; as a : self-satisfaction and pride b : respect
from peers and associates c : opportunity for advancement
3 : to recognize the challenge of the world today 4 : to be
recognized for doing something to meet those challenges

If you know of qualified graduates in engineering or the
sciences, or with an interest in marketing, finance or computer
science, we hope you will encourage them to write us: Re-
cruiting and College Relations, P.O. Box 1713-CE, Midland,
Michigan 48640. Dow is an equal opportunity employer--
male/female. DOW CHEMICAL U.S.A.
1 *Trademark of The Dow Chemical Company

WINTER 1980 ,,




University of California
Santa Barbara, CA 93106

N FEBRUARY, 1978 a questionnaire on process
control education was distributed to the 158
chemical engineering departments in the United
States and Canada. Completed questionnaires were
returned by 143 schools, or 90% of the 158 depart-
ments. This response compares quite favorably
with the 59-101 replies that were received in re-
cent AIChE surveys of undergraduate curricula
[1, 2]. The large number of replies is probably due
to two factors: 1) the questionnaire was kept very
brief, and 2) copies of the final report were
promised to those departments which submitted
completed questionnaires.


T HE SURVEY RESULTS indicate that process
control is firmly established in the undergradu-
ate curriculum since only 7 of the 143 respondents
(5%) do not offer undergraduate courses. By
contrast, 108 schools (75%) have required courses
and an additional 28 schools (20%) offer elective
courses. Interestingly enough, 4 of the 7 schools
which do not offer undergraduate courses in pro-
cess control do offer graduate courses. Thus only
3 schools of the 143 respondents do not offer any
process control courses.
Process control courses are also firmly es-
tablished at the graduate level. Seventy-two
schools (50%) offer graduate courses while an

The survey results-indicate that
process control is firmly established in
the undergraduate curriculum since only
7 of the 143 respondents (5%) do not
offer undergraduate courses.

*A preliminary version of this paper was presented at
the Miami Beach AIChE Meeting.

Textbook Selection for Undergraduate and Under-
graduate/Graduate Courses



Coughanowr and Koppel
Smith, Cecil
Others (one each)

Total 135

additional 15 schools (10%) offer courses which
are open to both graduate students and advanced
undergraduate students. Tables 1 and 2 list the
process control textbooks which have been adopted
for undergraduate and graduate courses, re-
The most striking result here is the con-
tinuing popularity of the book by Coughanowr and
Koppel which has been selected as an undergradu-
ate text by 69 departments and as a graduate text
by 7 departments. The dominant position of this
15 year old text is quite remarkable in view of the
significant developments which have occurred
since 1965 in both computer control hardware and

Textbook Selection for Graduate Courses

Smith, Cecil
Coughanowr and Koppel
CACHE Monographs
Lapidus and Luus
Other (one or two each)

Total 44

Copyright ChE Division, ASEE, 1980


Laboratory Control Experiments in Undergraduate
0 43
1-2 30
3-4 26
5+ 37
Some experiments
(number not available) 7
Total 143

in control theory. The results in Table 1 agree
quite well with a 1975 survey on undergraduate
process control courses [1]. It should be noted
that the numbers in Tables 1 and 2 are reported
on the basis of individual departments rather
than on the basis of courses offered. For example,
if a particular department offers two undergradu-
ate process control courses which use the same
textbook, this was counted only once in Table 1
rather than twice. By contrast, if two textbooks
were required for a particular course, they both
were included. Many of the 17 textbooks included
in the "Other" category in Tables 1 and 2 were
written for mechanical or electrical engineers and
are used in classes taken by both chemical engi-
neering students and other engineering students.
One hundred departments (70% of the re-
spondents) indicated that their curriculum in-

Dale E. Seborg received a B.S. degree from the University of
Wisconsin in 1964 and a Ph.D. degree from Princeton University in
1969. Both degrees were awarded in chemical engineering. He
taught at the University of Alberta for nine years before joining the
University of California, Santa Barbara in 1977. He is presently Pro-
fessor and Chairman of the Department of Chemical and Nuclear
Engineering at UCSB. Dr. Seborg is co-author of the book, Multi-
variable Computer Control: A Case Study. He is also the past chair-
man of Area 15B (Systems and Process Control) of the AIChE Na-
tional Program Committee.

The most striking result here is
the continuing popularity of the book by
Coughanowr and Koppel which has been selected
as an undergraduate text by 69 departments
and a graduate text by 7 departments.

cludes one or more laboratory experiments in pro-
cess control. Table 3 shows that 63 departments
offer courses that contain at least three control
experiments and 30 departments have one or two
experiments, usually as part of a unit operations
In compiling these statistics, each department
was included in only a single category. Thus if a
particular department offers two process control

Use of Real-Time Computers or Micro-Processors in
Control Experiments
Currently have a real-time system 48
Equipment on order or being installed 19
No equipment (but have tentative plans to
add equipment) 22
No equipment (and no plans for future
equipment) 53
Total 143

courses which include three and five experiments,
respectively, this department was included in the
tally for the "5+" category in Table 3.
During the past decade there has been con-
siderable interest in "real-time computing," that
is, in digital computers which are used for data
acquisition and control. Both industrial and aca-
demic personnel in the process control field have
maintained an active interest in the field of real-
time computing for the following reasons:
The widespread availability of inexpensive minicom-
puters and microprocessors;
Changing process control objectives in industrial
plants due to energy and environmental considera-
The realization that the application of most advanced
control strategies will inevitably require an on-line
digital computer.
The results in Table 4 indicate that 48 depart-
ments (34%) currently have control experiments
which involve a real-time computer while an ad-
ditional 19 departments (13%) have computer
systems on order or being installed.
Table 4 includes only those departments which
use real-time computers in conjunction with under-
graduate control experiments. It does not include


Real-Time Computers or Microprocessors
Currently Installed (53) or On Order (19)

Digital Equipment Corp.
Data General Corp.
Hewlett Packard
Texas Instruments
Miscellaneous (one each)
Not specified


Total 72

other departments which use minicomputers or
microprocessors exclusively in research labora-
tories. The 22 departments in the third category
in Table 4 typically are in a preliminary planning
stage or are seeking funds to purchase a real-time
system. Thus the results of this survey indicate a
continuing trend for incorporating a real-time
computer system in the undergraduate curricu-
Table 5 presents a summary of the 62 mini-
computers and 10 microprocessors which are
currently operating in chemical engineering de-
partments or on order. The numbers in Table 5
do not correspond directly to those in Table 4
since several chemical engineering departments
use more than one real-time computer in the under-
graduate curriculum.


T HE RESULTS OF THIS survey indicate that the
topic of process control has become firmly es-
tablished in the chemical engineering curriculum.
Only 3 of the 143 departments surveyed do not
teach any courses in process control. One hundred
and eight schools (75% of the respondents) have
required undergraduate courses while 87 schools
(61%) teach graduate level courses in process
control. Laboratory experiments in process control
are now available at 100 schools (70%). There is
a continuing trend toward providing students with
exposure to real-time computer systems in con-
junction with process control experiments; 67 de-
partments currently have such a system operating
or on order while an additional 22 departments
have tentative plans for such a system.
Fifteen years ago, process control was
generally regarded as a new, specialized topic

which was not part of mainstream chemical engi-
neering. The present survey demonstrates that this
situation no longer exists. Process control has
joined the more traditional topics such as trans-
port phenomena, thermodynamics and reactor
analysis in playing a central role in the chemical
engineering curriculum. E

1. Eisen, E. O., "Teaching of Undergraduate Process Dy-
namics and Control," paper presented in a mini-session
at the 68th Annual AIChE Meeting, Los Angeles (No-
vember, 1975).
2. Barker, D. H., "Undergraduate Curriculum 1976,"
Chem. Eng. Educ., Vol. XI, No. 2, (Spring, 1977).

BOOK REVIEW: Contact Catalysis
Continued from page 12.
hope of being able to reproduce catalysts of a given
type in different laboratories is rapidly becoming
a reality.
As one might infer from the variety of topics
and extent of treatment, these volumes are not
exactly for the beginner. One might have wished
some discussion of homogeneous catalysis, at least
in terms of analogs to heterogeneous systems, and
a more general inclusion of the concepts of co-
ordination chemistry as they relate to catalysis.
In all, however, some balance must be struck be-
tween coverage and length and the editor has
done an admirable job. The English translation
of the original Hungarian edition of 1966 is ex-
cellent and the text has been updated. The dust
jacket states that "the book will be useful to
workers studying catalysis in industrial and uni-
versity laboratories." The present reviewer feels
this is a correct statement and commendable for
its modesty. O

m news

Arthur E. Humphrey, dean of Penn's School
of Engineering and Applied Science, became the
eighth honoree to receive the James M. Van Lanen
Distinguished Service Award for his "life long
dedication and service to fermentation science and
the fermentation industry.
The award is named for a pioneer in fermenta-
tion technology and was established in 1976 as the
foremost award and citation of the ACS Division
of Microbial and Biochemical Technology.


class and home problems

The object of this column is to enhance our readers' collection of interesting and novel problems in
Chemical Engineering. Problems of the type than can be used to motivate the student by presenting a
particular principle in class or in a new light or that can be assigned as a novel home problem are re-
quested as well as those that are more traditional in nature that elucidate difficult concepts. Please sub-
mit them to Professor H. Scott Fogler, ChE Department, University of Michigan, Ann Arbor, MI 48109.


Pennsylvania State University
University Park, PA 16802

Editor's Note: Professor Kabel presented the
"Mirror Fog Problem" in the Fall 1979 issue of
GEE. We extended an invitation for student solu-
tions to this problem at the time of publication and
would like to congratulate Mauricio Fuentes of
Ecole Polytechnique, Montreal, Canada, who sub-
mitted the winning entry and by so doing has won
a year's subscription to GEE. Professor Kabel
graded the responses and, in his words, Mr.
Fuentes' entry was both "correct and excellently
done." The following is Professor Kabel's solution
to the problem.

Derivation of equations:
Use a microscopic model because momentum and
energy equations are not required due to isothermality
and no bulk flow.
Mass balance equation:
S+ v + VY + V
at Dx DY ?z
DAB D2C + D2CA + A]+Ca
DAB 2 2 + RA

Since vx = Vy = v = 0, CA =t f (x,z) and there is no
generation in the vapor space this equation becomes.
at DY'
which shows that the concentration at any point changes
with time because of diffusion in the y-direction.
Initial condition: At t = 0, CA = CA,sat at all y
Boundary conditions: At y = 0, CA = CA,room at all time
At y = Y, CA = CA,sat at all time
where Y is the location of front edge of the remaining
fog on the mirror. Note however that Y varies with time
going from 0 when t = 0 to 0.3 m when t = tf.
If an analytical solution of the equation is to be sought
this second boundary condition should be respecified. If the

solution is to be numerical, then one merely needs to keep
track of Y(t). The end of the calculation is t = t, when
Y = Ym, = 0.3 m. Y(t) can be obtained by equating
the total amount evaporated to the integrated mass flux
into the room neglecting the slight accumulation of water
vapor in the enlarging vapor space.
Let MAo be the initial total mass of water condensed, then
Amount evaporated = MAo = MA-
0.3 YXma
ft p yf0
Amount transferred to room = DA CA S dt
J y y= 0

where S = ZX

Yflax t "A
.oJ DY

Y = MA,

DCA dt
DY y = 0

The above is an adequate answer to the exam question. A
very simple analytical solution can be obtained as follows.
We can say that the flux at y = Y is equal to the amount
of moisture evaporated there per unit time. Then the
amount of moisture can be related to the rate at which
the boundary moves. Thus, if R = thickness of liquid

dCA g H20 evap.
Bdy y Y area time

PHno ZR dY g H0 evap/time
ZX dt area of transfer

S dCA PHo R dY
B dy y= X dt

If we assume that a steady state concentration profile is
established rapidly and maintained (shown by dynamic
analysis to be an excellent assumption) we get


CA,sat CA,room


A further simplification is obtained by taking CA,room = 0
Let CA,sat = CA,.

Y X dt


o oR


B dt = Y dY

o o

B tf = 0.5Y2 I = 0.5 Y2ma
d tf = 0.5 Y2max/B
for the mirror fog problem


106 g.m-3
1.3 x 10-5 m (obtained from experiment)
2.47 x 10-5 m2 s-1
17.3 g-m-3
0.3 m
4 x 10-3 m
3.5 x 106 s = 96 m = 4 days

This result appears high by about a factor of 4. There
are several explanations and we have calculated for
different assumptions. Probably the experimental circum-
stances (e.g. leakage around edges, etc.) do not meet
the idealizations of the model. [


University of Florida
Gainesville, FL 32611

Y OU ARE SPENDING the evening in a small town on
your way home for the holidays. At about
11:00 p.m. the local sheriff calls you and asks for
your help. He knows from the desk clerk that you
are a chemical engineer, and naturally assumes
you have some knowledge of forensic chemistry.
It seems that the body of John Lurie, a local
car dealer, had been found somewhat earlier in a
wooded area just outside of town. The local
coroner had gone fishing and there was no one
else to estimate the time of death. John Lurie had
been known to deal in "hot" cars and was thought
to be going to the police to confess and name his
four accomplices, Gus Nusselt, Bill Gurney, Ed
Reynolds, and Bob Prandtl. Nusselt had been
known to be out of town until 11:00 A.M. that
morning, Gurney had a solid alibi from 1:00 p.m.
on, Reynolds was with his girlfriend until about

6:00 A.M., when he left to go fishing, and Prandtl
was in jail the night before for drunkenness, and
was not released until about 8:00 A.M.
When you finally get to the body it is about
12:00 p.m. (midnight). You measure a rectal
temperature of 80F, and an air temperature of
70F. The air temperature has been about 700F all
Luckily, you brought your Perry's along.
Recognizing that the human body is mostly water,
1) calculate the latest possible time the murder
could have occurred and 2) state the possible
NOTE: For practical purposes, John Lurie
can be assumed to be shaped like a rectangular
slab. He is 10 inches thick from his back to his
breastbone. Body temperature is 98.60F. Rectal
temperature is equivalent to core or centerline
For comparison, a pathology formula some-
times used to estimate the time of death is*
of h. s d 98.6 rectal temperature
No. of hrs. since death -1

We will use the Gurney-Lurie charts, Perry's
4th Ed., p. 10-6, 10-7. To calculate the latest time
the murder could have occurred, assume maximum
rate of cooling, or in other words that the surface
of the body is at 70F (same as saying h = oo or
m = 0). We also neglect radiative losses since the
body was found in a "heavily wooded" area.
Then, if we assume infinite width and depth,

S T, -T 70-80 0.35
T To 70-98.6
From graph, for n = 0
X 0.54
k 0.36
a pC 62.4 x .0 0.0058 ft2/hr

5 inches
X1 5 incs 0.42 ft.
0.54 x (0.42) 2
t 0.0058 = 16.4 hours or
16 hours, 24 minutes

1) Murder had to occur before 7:40 A.M.

*"Medical Jurisprudence and Toxicology," Glaister and
Rentoul, 12th Ed., Livingston Ltd., Edinburgh, 1966, p. 110.


Copyright ChE Division, ASEE, 1980

2) Possible Suspects: Gurney, Reynolds
From the pathology, formula:
98.6 80
98.6-80 = 12.4 hours
(or murder occurred at 12 noon)
This formula, however, takes no account of
changes in room temperature, or body thickness,
and in fact is known to underpredict the time of
death except for the first few hours. From our
superior knowledge of heat transfer, we have
eliminated Prandtl and Nusselt as suspects. OE

Helpful comments were provided by Professor
J. H. Hand, University of Michigan.
Editor's Note: Professor Gordon's purpose in his
solution to the foregoing problem, "In The Heat
of the Night," was to illustrate the use of the
Gurney-Lurie charts assuming a simple one-dimen-
sional model. Professor Fogler, CEE Problem
Section Editor, asked his student, Alan Basio, to
comment on this simplified solution. Mr. Basio's
reply follows.

University of Michigan
Ann Arbor, MI 48109
It was previously assumed that Lurie, the dead
man, is an infinite slab. From this assumption, the
time is 16.4 hours since Lurie was killed.
I used Newman's Rule and assumed Lurie is
an infinitely long slab with a. finite width and
depth. Newman's Rule in this situation is the

Y = Y, =T- T =0.350 (1)
-T T
T,8 T.
Let Lurie be 10" deep, as previously specified,
and 1.3 feet wide. Use the same values as before
for Y and a. There are now two values of X to be
found on the Gurney-Lurie Charts:
Xx = at/(5/12)2 and X, = at/(1.35/2)2. The
time must be the same in both Xx and Y,, and the
product YY, = 0.350.
Criteria for solution: (1) YxY, = 0.35
(2) X.(x) X,(y) t
a a
Results: By trial and error the times are found

to be within 2.7% of each other.
Yx = 0.420 Y, = 0.833
X. = 0.45 X, = 0.18
YY, = (0.42) (0.833) = 0.350

t (0.45) (5/12)2 13.47 hrs.
S 0.18 (0.65)2 = 13.10 hrs.
13.47 13.10
13.47 x 100 2.7% difference
If the width of Lurie is 1.3 ft., he died 13.3
hrs. ago, not 16.4 hrs.
The width of Lurie is important. If Lurie is
2.6 ft. wide, for example, he dies 16.3 hours earlier.
In other words, the infinite slab assumption im-
proves when Lurie is assumed over 2.0 feet wide,
approaching an answer of t = 16.4 hrs. O

BOOK REVIEW: Reactor Design
Continued from page 24.
The book is an excellent work. The author has
covered a very large area of relatively difficult
material in a highly readable fashion and has pro-
vided enough detail so that the reader is able to
come to grips with the realities of chemical re-
actor design. It is accurate and relatively com-
plete. There is a considerable amount of specialized
knowledge, based upon over 1000 references, aug-
mented by the author's own considerable ex-
perience. In many areas, it stands at the edge of
chemical reactor design knowledge that is in the
public domain. As such it will continue to be a
valuable reference work for many years to come.
Its only major shortcoming is insufficient il-
lustrations and a lack of exercises or problems
for the student. The fourteen case studies of
Volume II serve to illustrate design principles but
only cover a fraction of the material in Volume I.
In order to serve as a text for a graduate course in
chemical reactor design, it would have to be sup-
plemented by problems developed to reinforce
specific points and others which would require the
student to integrate these ideas into a chemical
reactor design. The latter would be an under-
taking of the order of a term paper.
These two volumes are a major contribution to
the chemical engineering literature. They belong
in the library of every chemical engineer who is
concerned with research, development, design, or,
in many cases, operation of chemical reactors or
conversion processes. O


Continued from page 16.
The evaluate V v the continuity equation is
used (see ref. 19) :

+ +V (pv) =0

gaseous phase, equation (13) is not so useful for
v, will become a function of z and it will not be
possible to take it out of the differential. If the
number of moles stays constant, equation (13) is
reduced to:


But for this system V p = 0. Besides p = m/V and
am/at = 0 because the total mass of the system
is constant in time. Substituting these relation-
ships into equation (10) and operating:
1 DV
Sv (11)
V at
Substituting Ci by Ni (Ci = Ni/V) and per-
forming the differentiation, the equation for r,
in the case of an isothermal variable volume batch
reactor, results:
r (12)
a V(t) dt
The partial differential is now a total differen-
tial insofar as Ni is a function of time only. It
must be noticed, however, that we should know
the relationship existing between the change of
volume and the reaction extent, i.e., if the extent
of the reaction is expressed in terms of conver-
sion, there should be at hand a relationship of the
following type: V (t) = V (Vo,x). In most gaseous
systems a linear variation of volume with conver-
sion is often assumed (9).


U NDER STEADY CONDITIONS, general equation
(7) is reduced to:
V Ni = ai r
If, according to the model it is supposed that
there are no diffusion or dispersion effects, the
mass flux is only due to the global convective flow.
Ni = Ci v
from where we finally have:
r d(Ci v) (13)
a, dz
since in this reactor the flow is uni-directional.
(Direction z has been chosen as representative of
the model).
If the total number of moles is not preserved
and, furthermore, if the reaction takes place in a

vr dCi
ar- dz
ai dz


which, obviously, also includes the assumption that
pressure changes along the reactor are small (due
to losses by friction, for example) because other-
wise v, would not be independent of z, either.
Equation (13) can be adequately modified to
become useful even in those cases in which the
number of moles is not constant.
To do so, we simply transform the equation
and work in terms of mass fractions (w). Re-
calling that:

C p wi

In this equation wi is the mass fraction of com-
ponent i and Mi its molecular weight. Substituting
in equation (13):

d LMpw vZ =air
~M1 I


and since the mass flow rate Go is constant:
p v. = Go = constant; hence, the rate of reaction
can be written as:

SG dwi
ai Mi dz
ai Mi dz


The SSICFSTR is an ideal type of system, in
which concentration of reactants does not depend
upon time or position within the reactor. The
mathematical description of the flow within the
reactor is exceedingly difficult, as we are dealing
with a highly idealized case which, consequently,
cannot be fully achieved in practice. Nevertheless,
in many cases the deviations are almost negligible
and the system has been successfully modelled.
The exact mathematical description cannot be ac-
complished because the model implies a transport
of mass, instantaneously, over finite distances.
But the difficulty may be overcome if we do
away with the necessity of describing the internal
pattern of the flow inside the reactor. To do so,
the general equation (7) is integrated over the


This statement sums up the whole problem:
The rate of reaction expression is the "sink" or "source" term in the
continuity equation for multicomponent systems which will take into account the creation
or destruction of the said species by chemical reaction.

volume of the reactor so as to obtain a macroscopic

C' dV=- (VV Ni) dV + Fai rdV (17)
Under steady state conditions the left-hand
side is zero and, as the assumptions of the model
grant that all properties within the reactor are
constant, r is not a function of the space co-
ordinates and it may be taken out of the integral.
With this, the previous equation is reduced to:

airVR= (V Ni) dV (18)
Applying the divergence theorem to the right-
hand side of equation (18), we obtain:

air VR= (Ni n) dA (19)

The integration performed over the whole
surface of the reactor may be evaluated because
the flux is non-zero only at the inlets and outlets.

S(Ni n) dA = (Ni n) dA + (Ni n) dA
A In. Out.
On the right-hand side, the first term repre-
sents the inlet flow of component i and the second
one, the outlet flow. Taking into account the di-
rections of unit normal vectors n, the final equa-
tion is:
r = (Fi outlet Fi, inlet) (21)
ai VR
which is the expression usually written for the re-
action rate in a continuous stirred tank reactor.
The integration of the differential equation (7),
so accomplished, brings about a macroscopic
balance for species i, which is usually the start-
ing point of the derivations in the books on applied
kinetics. In this work we have followed this ap-
proach in order to demonstrate the absolute
generality of equation (7).
In the following section, this analysis will be
extended to two more complex experimental
systems, the recycle reactors. These are often

useful for obtaining kinetic data.

R ECYCLE REACTORS HAVE been widely used since
the publication of the original papers by
Hougen [20], Perkins and Race [21], Biskis and
Smith [22], Korbach and Stewart [23], and
Cassano, Matsuura and Smith [24] as a means of
retaining the differential operation of the reactor
and, at the same time, eliminating the restrictions
of inaccuracy in the analysis of the small composi-
tion changes.
Moreover, control of the flow rates in the re-
cycle allows the reduction of diffusional resistances
and the elimination of temperature gradients. Diffi-
culties may be centered around the effects of re-
action by-products, the considerably longer time
usually needed to obtain the steady state condition
in the recycling section of the apparatus and the
difficulty in operating under pre-fixed concentra-
tion conditions. (The last two are especially im-
portant for the continuous type).
Once more, "general definitions" will be useless
and we shall have to resort to the general mass in-
ventory. In order to simplify the matter, let us
consider the case when the total number of moles
is constant.
FIGURE 1 (A) SHOWS the system under con-
sideration. Operating conditions must be ad-
justed in order to fulfill the following assump-
1) The operation in Va is differential, i.e.,
the outlet concentration Ci,f is very close
to the inlet concentration of the reactor
2) Differences in concentration between Ci,o
and Ci,f are accurately measured.
3) High recycling flow rate (Q).
When Q co the whole reactor, analyzed in
the control volume (2), is an excellent approxi-
mation to a continuous flow stirred tank reactor,
working at differential conversions as the react-
ing mixture goes through the control volume (1).
The General equation (7) will be applied to each
of these systems.


F ------------.

t Ci,Q+q Cf

fCo,q Cf,q


Under steady state conditions, the concentra-
tion in the reactor is independent of time. The
differential equation is reduced to:

V Ni = r, ai (22)
On the other hand, the operational characteristics
allow us to neglect any form of dispersion or diffu-
sion effects. Consequently:
Ni = Ci v (23)
If the differential equation (22) is integrated
over the control volume, the result is:

S(V -Ni) dV =f rai dV
On the left-hand side we shall apply the di-
vergence theorem and on the other side we shall
take into account the fact that the reactor is
differential. Substituting expression (23) yields:

f(n Ci v) dA = r ai dV
and finally:
(q + Q) (Ci,f Ci,i) = ai ri Va (24)
On the other hand, if the whole system (2) is
treated as a CFSTR the application of equation
(21) will yield:

q (Ci,, Ci,o) = r2 ai Va


In equation (25) we have VR only on the right-
hand side, because it is the only part of the total
volume where r is different from zero. But the
global velocity r, has to be equal to that produced
in the reactor itself, that is to say r,. If it is shown
that r, accurately represents a differential rate of

I c
i V I



r = q (C, C,o)
ai VR


Notice that the condition of a high recycling
flow, necessary for the differential operation in
VR, coincides with the requirements for the opera-
tion of the global system as a continuous stirred
tank reactor. The extension to a system with
variable number of moles only complicates the


F IGURE 1 (B) illustrates the system under con-
sideration. For extremely slow reactions and
for cases where one wishes to avoid serious limita-
tions in the size of the samples for analysis, this
is an adequate experimental device. Within this
system there are no disadvantages such as those
pointed out for a continuous recycle reactor, but
an experimental problem may arise: the existence
of a recycling device (with movable parts in most
cases) could introduce contamination of the react-
ing mixture from the outside. For a batch system,
the impurity level will grow with time. This is
not so severe in continuous systems.
The operating conditions are as follows:
1) The operation in VR is differential.
2) For reasonable intervals of time, concen-
tration differences are accurately
measured in V.
3) High recirculating flow, and adequate
mixing in V.
We treat the whole system as a batch reactor:
if the recirculating flow is high, the concentration
will be uniform. Hence, V N =- 0 and results:


reaction, then the values which may be obtained
through the application of equation (25) will
portray the exact rate of reaction and not an aver-
age value. This will be true if Ci,i is very close
to Cif as has been initially assumed. The only re-
maining doubt would be to know how these condi-
tions could be accomplished. As r, = r2, we have:

(q + Q) (Ci, Ci,,) = q (Ci,f Ci,o)

C Q Ci,f q C,o

If, as was first assumed, Q is sufficiently high,
Q >> q and therefore Cii 0 Ci,(.
For isothermal continuous recycle reactors,
working under the conditions stated above, an
adequate expression for the rate of reaction


r r
S dC1 dV = ai rdV
JV dt JV
Since according to previous assumptions, con-
centration is not a function of position, the total
derivative has been employed and it may be taken
out of the volume integral. On the: right-hand
side, the integral will be different from zero only
in those portions of the volume where r is different
from zero. Due to the differential performance of
VR, one then obtains:
dC (V + VR) =ai rVR
and the rate of reaction, when there is no varia-
tion in the number of moles, is finally:
= (V + Va) dC (27)
r = --Vdt (27)
VR dt
This equation must be corrected for additional
changes of concentration, in case the sample
volumes for analysis were significant. A great re-
lationship of V/VR reduces this problem, but may
largely prolong the necessary reaction time to
attain accurately measured conversions.
Abalance in the reactor itself shows the con-
ditions for the differential operation of Va. At
each cycle the reactor behaves as a steady state
isothermal continuous plug flow reactor.
V *Ni = ai r

1 (V Ni) d = r dV
Assuming, for the time being, an average
value of r, the result will be:
Q (C,, Ci,i) = ai ravg V
where Ci,t and Ci,i are the outlet and inlet con-
centrations of reactor Vn at each cycle. If the rate
of reaction has a finite value and, as previously as-
sumed, Q is high, the difference between inlet and
outlet concentrations will be small. By increasing
Q the difference could be made small enough to
turn rav9 into a differential rate of reaction. Notice
that this condition was also assumed as necessary
to propose a uniform composition model. It must
also be noticed that an adequate experimental
device should minimize the volumes of the connect-
ing lines between the reactor Va and the tank V.

N THIS WORK WE have emphasized the analysis
of the different isothermal homogeneous react-

ing systems. The adequate treatment for hetero-
geneous reactions (catalyzed and non-catalyzed)
is outside its scope.
It is not far-fetched, however, to notice that,
in most cases, the flaws of the so-called definitions
are even more evident within these systems. The
problem may be summarized as follows:
1) At the microscopic level all heterogeneous re-
actions take place at interphases.
2) Even at the macroscopic level, many heterogeneous
reactions take place at interphases.
3) In many cases the rate of reaction takes place not
only inside the control volume but on its boundaries
as well.
4) Hence, accurately speaking, the rate of reaction
will, in many cases, be a boundary condition of
the general mass conservation equation.
5) When this happens at the microscopic level (in the
case of a catalyst, for example), an "effective"
rate has been used due to the difficulty in solving
the conservation equations with complicated geo-
metrics for the boundary conditions.
6) At the macroscopic level (for example, the case of
free radical termination reactions on the walls of
a reactor) when the rates of reaction are boundary
conditions, the conservation equations are compli-
cated, since diffusional terms cannot be neglected.
See for example reference [25].
7) Even ontologically, the rates of reaction in hetero-
geneous systems undergo a change, insofar as their
intensive character is attained by means of an ex-
pression referring to the area of this boundary
(real or ideal).
All this makes even more evident the futility
of trying to establish a general "definition" of a
reaction rate.

N THE PREVIOUS sections, six different expres-
sions have been attained for the rate of reaction:
equations (8), (12), (21), (26) and (27). Many
others could be found for other physical systems
using equation (7) as a starting point. Quoting
Petersen [16]: "to argue that any of these (rate
of reaction expressions) is more correct than all
of the others as its defining equation, is to confuse
a conservation equation with a definition." This
statement sums up the whole problem. The rate
of reaction expression is the "sink" or "source"
term in the continuity equation for multicompon-
ent systems which will take into account the
creation or destruction of the said species by
chemical reaction.
The rates of reaction thus attained will be in-
dependent of the system used to measure them
(provided it is a homogeneous reaction). This
means that the kinetic expression of the rate of


reaction r = ( (T, Ci, P, etc .....), if determined
using equation (7) as a starting point, will be in-
dependent of the physical device employed to
obtain the kinetic data.
There may exist a sound definition of an ex-
tensive rate of reaction based on the concept of
the "extent of reaction," both introduced by De
Donder [26], which may be useful for thermo-
dynamic calculations but the idea becomes devoid
of general validity when one needs an intensive
property. For the purposes of reaction engineer-
ing this is legitimate but it is of little help.

To Prof. Elsa I. Grimaldi to whom I am greatly in-
debted not only for her invaluable contribution to the
writing of the manuscript but also for her everlasting
patience in doing it over and over again until it finally
achieved its final form.
A : Area (cm2)
a :Stoichiometric coefficient
C :Concentration (mole-cm-3)
F :Molar flow rate (mole*s-1)
G : Mass flow rate per unit area (
M Molecular weight (gr-mole-1)
m Mass (gr)
N Number of moles
N Molar flux (
n : Outwardly directed unit normal vector
P :Pressure (
Q :Volumetric recycle flow rate (cm8.s-1)
q :Volumetric input flow rate (cms.s-1)
r Rate of reaction (intensive) (mole'cm-38s-1)
T :Temperature (oK)
t :Time (s)
V :Volume (cm3)
v :Linear velocity (cm*s-1)
V, : Volume of reactor (cm3)
w Mass fraction
x :Conversion
p : Density (
S: Kinetic expression for rate of reaction
V :Vector operator
Subindices and Supraindexes
avg: Average value
i Indicates species or initial condition, according
to context
f :Final condition
o :Inlet condition
R :Indicates reactor
z Indicates direction
: Indicates vector
Indicates molar average velocity

1) GLASSTONE, S., "Textbook of Physical Chemistry",
D. Van Nostrand Co., Princeton, N.J., (1946).

2) BENSON, S.W., "The Foundations of Chemical
Kinetics", Me Graw Hill Book Co., New York,
3) DANIELS, F., "Chemical Kinetics", Cornell Uni-
versity Press, (1938).
4) LAIDLER, K. J., "Chemical Kinetics", McGraw Hill
Book Co., New York, 2nd. ed., (1965).
5) FROST, A. A., and PEARSON, E. G., "Kinetics and
Mechanism", J. Wiley & Sons, New York, 2nd. ed.,
6) JOHNSTON, H. S., "Gas Phase Reaction Rate
Theory", The Ronald Press Co., New York, (1966).
7) HOUGEN, O. A., and WATSON, K. M., "Chemical
Process Principles", Part III, J. Wiley & Sons, New
York, (1947).
8) SMITH, J. M., "Chemical Engineering Kinetics", Me
Graw Hill Book Co., New York, (1956).
9) LEVENSPIEL, 0., "Chemical Reaction Engineer-
ing", J. Wiley & Sons, New York, (1962).
10) WALAS, S. W., "Reaction Kinetics for Chemical
Engineers", McGraw Hill Book Co., New York,
11) BOUDART, M., "Kinetics of Chemical Processes",
Prentice Hall Englewood Cliffs, N. J., (1968).
12) PANNETIER, G., and SOUCHAY, P., "Chemical
Kinetics", (Translation by H.D. Gesser and Emond),
Elsevier Publishing Co., New York, (1959).
13) KRAMERS, H. and WESTERTERP, K. R., "Ele-
ments of Chemical Reactor Design and Operation",
Academic Press, New York, (1963).
14) ARIS, R., "Introduction to the Analysis of Chemical
Reactors", Prentice Hall, Englewood Cliffs, N. J.,
15) DENBIGH, K. G., "Chemical Reactor Theory", Cam-
bridge University Press, Cambridge, (1965).
16) PETERSEN, E. E., "Chemical Reaction Analysis",
Prentice Hall, Englewood Cliffs, N. J., (1965).
17) AMDUR, I. and HAMMES, G. G., "Chemical
Kinetics", McGraw Hill Book Co., New York, (1966).
18) ARIS, R., "Vectors, Tensors, and the Basic Equa-
tions of Fluid Mechanics". Prentice Hall, Englewood
Cliffs, N. J., (1962).
E. N., "Transport Phenomena", J. Wiley & Sons,
20) HOUGEN, O. A., "Reaction Kinetics in Chemical
Engineering", Chem. Eng. Progr. Monograph Ser.
47, No. 1, (1951).
21) PERKINS, T. K., and RASE, H. F., A.I.Ch.E.
Journal, 4, 351, (1958).
22) BISKIS, E. G. and SMITH, J. M., A.I.Ch.E. Journal,
9, 677, (1963).
23) KORBACH, P. F. and STEWART, W. E., I.E.C. Fund.
3,24, (1968).
J. M., I.E.C. Fund. 7, 655, (1968).
J. M., I.E.C. 59, 18, (1967).
26) DE DONDER, Th., "Legons de Thermodynamique et
de Chimie Physique", Paris, (1920); quoted from
Prigogine I. and Defay, R., "Chemical Thermody-
namics", Longmans, Green and Co. Ltd., London,



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You know about Atlantic Richfield Company. Now start reading between the lines. ARCO Oil and ~;>~ <> ARCO Petroleum Product Company <> ARCO Transport ~~ s om e, any () ARCO Chemic ~ I c ~ <> ANACONDA c ~r ... S2.'J!P. any ARCO International Oil and Ga J Company <> ARCO ~~ 1 .., om any <> Wlthalllhecompanl eo youshouldbf!lalklngto,whynotmeele i ghlwith OMi"1erview?Formor e i nformalion regarding career opportuni1 i &S wlth11$ S<>eyourPlacemen1011ice AtlanticRichfieldCompany <>


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This sign marks the rood that leads markctingmajorsatlocationsthroughout i nto our International Headquarters in theU.S St.l.oois T hese words, "Monsanto Dr i ve" and career paths that are geared for haveanotheran d moresignificantmean upward mob i lity. I f you are a person i ngatMonsan t o. l t'sawayo f ex pr essing who has set high goals and has an thespecialquali 1i esofM011santopeop l e, ach i evement record, and who wants to who have the "ill to meet challenges ~dvance and succeed. be sure to talk head,on-toaa:omplishandsucceeyment Dept., Bldg.A3Sll, 800 roncerningfood,energy,theenvironment North Lindbergh. St. Louis, Mo. 63166. andothers ~!1~~'t:~~ 1 ~ign=~t~i::i:1 }: Monsanto




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@fi:ilcla.ssroom TH E I N TE GRAT I ON O F REAL TI M E COM PU T I N G IN T O PR OC E SS CO NTROL TE AC HING PART II : THE UNDERGRADUATE COURSE .II, .WORA R J ud W. H. RAY ~=.=~~~ P ::-..:.:-, .... -_-:=-_.1o.;--,::: .........._no ___ .__.,.,..___ =.~:i:-=:-.:..-:"~ :.-a.!.":.= ~1'.= '..':.-:=..: ~n=i-cl,.,..,..ic,,-,._ '1' :!.:-":;.:::.:'n~~~~l:~U,:= ::.=-:.-;~~=~= l o,U..Mlpol>nt


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,...._ .... ..... .... _,.. ....... .. -" "'""w """"""'"..,'" .. ,.. .... .................. I. <-1100.....--L S.A wN_ ., ___ .... ... w.,_ _____ .... __ I.Y ___ ,.. ...__.._.. ...... -.... ...... ____ ..... .._ __ ..... _., ___ _____ .._ ------._...__..., __ ........... ______ ...... ____ ..... .. ~-----... _..., ____ .................. lllbl.r_T_)I_,._ ----.. .. ...... .... ___ .. .......... .__,__ .. ----ififj ~-.. ---.. u.1. ---,_-,u.s. ___ ,, __ -.. ~. J P THE INSTITUTE OF PAPER CHEMISTRY ASSOCIATE DEAN --~,.. .. __ ., __ ...... .,,_.-., ,.,. ____ .,,.._ ---. .. -c-..... --..-.. ...... ---"'~ ........... ............. -. .-. ......... .. -."'""" ....... ...... ............... .......... ... ......._ ..... .. =-~ .. ":"'~::~":.:..-=--..: _.,...,.._ .... ___ ..,......, ,_ ... ......,, c_,. ....,.-.,.._..,. __ l nOl;tu :'o '.:~ ... ~hemKl,y .+.~w,u,n ::..-::::..:.---


The Leading Authorities. .. and the Leading Tex1s ~~ on Processes in Chemical ~.......,,.,,,, ____ Engneering ~.":"::""..::.:,~::. Heteroaeneous Mass Transfer ~~ ons n. Rober1E.Treybal .!=::==--= .. _.,.. _____ .. _...,._ =~=::~htto you Dy McGrawCatalysis in Practice ~-==~:::'!. -. :;;.~:=:.=?~ er.:==-~=Plant Design and Economics for ineers Hill r --~ .. --------: ~ ,~ i ~-=]~..'.$:o"E?.S. i 1!nr : 0 :i,r;- -: i :=:-:::u:= :: ...,_., .. I =---. I --'-": --~-.. _. .. ___________ :


OOlI labonuory PROCESS CONTROL E X PERIMENT THE TOILET TAN K A n....,.LTOIIZITAN1'1o--la,ipl'OI ,,._ _,,..,._._..i.lOOtholuk t.ot-Catthoclooi...i~ocateC.t,,, .....,1,..i.Uaclhoi..i.t._lff,..IOIIIO.-.... ,..,u..dialarbeacotU..,._..toUl~;.i:~~::::.--;-.,::.: ...,. ... .-1ra-lolnflalledlatlooleod 11 .. anc1._..r1,.. ... 1oi.t-10thol,.. tldo.tU..WlkIL l' or...._,__.. ~lho_,,_1w,ion,....,btl ... 1&1loMI L11o.,.., T ank : A muabolo,,..ooU..ta n krl .. A{ -11-U IIO U H I ____ A._ ........ ...... ..., __


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reCOgDitiOD\ 1 rek-i g' ni s h-011 -~g\ n l : the actio n o f recognizing ; the sta t e of being recognized; as a : AC K NOWLEDGMCNT 2 : special notice o r a tt ention. rec-og-ni-tion\ as we see i t \ I : the primary mo1iva1ion to do crca l i\ c v.ork for an out srn n ding co mp any 2: ACK'-'OY.LEDG\lf.Vf of the quality of th at work: a s a : self-sat i sfoccion and pride b : respect fr om peers and associates c : opportunity for advance ment 3 : to recognize the challenge of the v.orld today 4 : 10 be recogni z ed for doing so methin g to meet those cha lleng es t o m o rr ow. If you know ol qualified graduates i n engineering or the sciences or with an in t erest in marketing finance or computer science we hope you will encourage them 10 write us: Re cruI11ng and College Relations P 0. Box 1713-CE Midland, Michigan 48640 Dow 1s an equal opportunity employer male/lemale ~_!,~';,_M~~~


@A curricu lum A SURV E Y OF PROCESS CONTROL EDUCATION IN THE UNITED STATES AND CANADA' l M l"ENUH, 117& & .-...,...i ... .... ollotribule,I .. U., IM -..i...ion,t...tnr~l&IIIU..U..;tod BlatooandCo..-.C-pleloclo-UO,,...i,.,...,.. rotumodb7 I0 0d1rad .. 1

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ACKNOWLEDGMENTS Departmental Sponsors: Thefollowing 137deponme n 1><;0n 1 fibvted 1 0 t he o uppo rt o l CHEMICAL ENGINEERING EDUCATION i n 1979. u ....... ... .... u ....... ..... .. ... Id'<'-"'' I_..,,.,.,...., u "'"""' 1/M ... ol< to!A i... /ol ...... 7 ....... .. .__ ... To,,.t;o1,_, .... .. c., ...... "''""'Y- c.i.-,.,., .., c_,.,.,..,.c....,w. ..,._c ... .-. c,.,. .,.,... Col_,_,.,....,. ~-.. --of T ~1.. T- ,.,,._,,.C..._., c..,....,,.,o,_(......,.l "--"- c-,.,~<.,...,, c -,.,.,_ """"""'"c;.-...<- ..... J c.,--,...11-11.i_, ,. ..... .. Tw .. 1/~ii t; ol ,. n! <, ,t~ ... k.,_ ~100.,.tt,\l>fts N ,,_ ,.,, ... ,.._ ... =- ""'-"'Y""""" --

PROCTER & GAMBLE is looking for In R&D / Product Development Thll~ii,flllO"l,tlllrlOrN -arldimpl-,iolnow O>lillll'lllp,oca,m,togetntcwllil'""'_,_ll>eful P#,grol!<.,,,.,,>CanllIOr~~--~---llf~ .....,. __ --~.,.,..~ -M~---v~ dollrfflol"""'..>on,-~&e;, ~M,n.lln<:f.)Q-" ..... .......... llong11!CW'li(allt\,J/Ot....,"""' '"10,.Thil<'VOlu!lor>..-ntludtprog,fflM' ~e-to _,.,_ '"~' ........ .-..,...,.,... ,w;-..oOIMICprWl" ...__.,......., .. ~o,Unear,g-.,,.qo.,_.~~ -~.. o,c...,_-ol -20--onlil..,,._ __ p,OdO,K1o. ............ P&G"-a(l'I.-,,,_ ____ ... 0..-----~ ,_.rn,,,~-_ ,,_ll!I_OIOU' U.S--_,.i.j RESPONSIBILITY NOW! ::,~aes,o<1 i,,tl'lls ..,u ,,.. __ Tiw~oct .... _, __ HDH / Mi h

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