The vapor pressure of a mixture of H₂O and D₂O

MISSING IMAGE

Material Information

Title:
The vapor pressure of a mixture of H₂O and D₂O
Physical Description:
7 p. : ill. ; 26 cm.
Language:
English
Creator:
Hale, C. F
Oliver, George D
U.S. Atomic Energy Commission
Publisher:
K-25 Plant, Carbide and Carbon Chemicals Company
Place of Publication:
Oak Ridge, TN
Publication Date:

Subjects

Subjects / Keywords:
Vapor pressure   ( lcsh )
Chemistry   ( lcsh )
Genre:
bibliography   ( marcgt )
non-fiction   ( marcgt )

Notes

Bibliography:
Includes bilbiographical references (p. 7).
Statement of Responsibility:
by C. F. Hale and George D. Oliver
General Note:
"K-979."
General Note:
"November 24, 1952."
General Note:
"Work performed under Contract No. W-7405-Eng-26"--P. 3.

Record Information

Source Institution:
University of Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
aleph - 005012312
oclc - 71009634
System ID:
AA00008503:00001

Full Text
y 34th


_ ASSIFIED


K-979

Subject Category: CHEMISTRY


UNITED STATES


ATOMIC


ENERGY


COMMISSION


THE VAPOR PRESSURE OF A MIXTURE
OF H20 AND D20


By
C. F. Hale
George D. Oliver










November 24, 1952

K-25 Plant
Carbide and Carbon Chemicals Company
Oak Ridge, Tennessee



Technical Information Service, Oak Ridge, Tennessee


7'"1












Date Declassified:


January


1956.


This


report


been reproduced directly


from the


best


available


copy.


Issuance of this


document


does


constitute authority


for dec
similar


lassification


content


title


classified


by the


material


of the


same or


same authors.


Printed


USA.,


Price


cents.


Available


from


Office of Technical


Services,


Department of


Commerce,


Wash-


ington







K-97


THE VAPOR PRESSURE OF


A MIXTURE OF HO AND DO


Hale


and George D.


Oliver


Work Supervised by


H. A.


Bernhardt


Laboratory Division


Hurd,


Superintendent


Date of Issue:


November


24,1952


STRAC


The vapor pressure


difference
determined


a 50-50 mole mixture


(aIo))


in pressure of H20 and EDO from 160 to 3
by means of a high pressure ebulliometer


of H0 and D20 and
H2


143 psia.


have


been


. A plot of the data


shows the vapor pressures of H20, D20,
340.9 psia. The vapor pressure of HDO
D20.


Work performed under Contract


and HDO to


be equal at


220.


an average of that of H20 and





No. W-7405-Eng-26


CARBIDE AND CARBON CHEMICALS COMPANY
UNION CARBIDE AND CARBON CORPORATION


K-25
Oak Ridge,


Plant
Tennessee









THE VAPOR PRESSURE OF A MIXTURE OF H,0 AnT) DO


A recent report by 01
data on pure D20 and
psia. to the critical


iver, Grisard and Milton (2) presented the vapor pressure
the difference in pressure of D20 and H20 from 200
point. In exploring the possibilities of producing


heavy water by distillation at high temperatures,


the vapor pressure of a


50 mole % mixture of D20 and H20 has now been measured from about 150 to
3000 pounds. Since the first report gave a short review of the vapor pres-


sure and critical constants data found in the


literature,


only the experi-


mental data on the mixture will be considered here


EXPERIMENTAL


Material


The D20 was the same as that used in the previous work:
2.7 x 10 mhos; pH, 6.5; weight % D20, 99.87. Heavy w


British CoQlumbia,
of the O0l isotope


conductivity,
rater from Trail,
A


the source of this sample, normally contains about 0.3k
. The sample of normal water was doubly distilled with


the second distillation being made from a permanganate solution.


paring the 50-50 mole % mixture,
mol %) and the weight % D20, 99.8
culating the weights of material.


20.0283 and for o20 of


18.0157, th


the amount of D20 in normal


'7,


of the heavy water,


water


In pre-
(0.0147


were used in cal-


Using molecular weights for D20 of
e composition of the sample placed in the


boiling point tube was calculated to be 50.33 mol % D20 and


49.67 mol % H20.


Apparatus and Procedure


All apparatus used in this


investigation was the same as that described pre-


viously (2)


. Briefly,


connected through traps


the apparatus was composed of two boiling point tubes
to a common pressure system containing helium. The


boiling temperature of the HDO in one tube was compared directly with the
boiling temperature of normal water in the other. A platinum thermohm and
G-2 Mueller bridge with accessory equipment were used to measure tempera-


tures.


The system pressure corresponding to the observed boiling point of


the normal water was obtained from steam tables.


RESULTS AND DISCUSSION


It has been assumed that


the vapor pressure of a 50-50 mole % mixture of


D20 and HW0 would be an average of the vapor pressure of each compound. Of
course, this postulation was based on the assumption that an ideal solution
is formed by mixing D20 and H20.

Boiling point measurements were made on H20 and HDO over the pressure range
of 150 to 3000 psia. These data and the difference in the boiling points


at each observed pressure are listed in table I.


Using the data of table


and the previous work (2), a plot was made of the boiling point difference
between H20 and D20, and H20 and HDO. This plot, figure 1, shows the boiling
points of the 50-50 mole % mixture, HDO, to be an average of those for the





5
tO o





IDI

- -
0< i0





--_----- ----- 0



N Uz
- ---




- 1~~ La 0






Z I I
_----- ---- -. Z
- _- o








. 0
S- I ~o
X S ---- --



















: a

oo
I4 --- ---- -













rI
0 -------- --------- -


























0 Ii
1i0
I. -----^ -m--- ---- 0t 0 <
_ _4 _J____- Er 0U u
0p .












,C I 0
-- 0
---- --0__-__




^ 7 --- -- o)




rZr
-0 w








pure materials.
temperature, 22


eluded


that


Moreover,
0.7C., and


three


pressure,


D20 and H20 form an


The data obtained above


3000 psia.


curves cro
340.9 psia.


ass at


the same point of


Therefore,


ideal solution over the


indicate


that


entire


the critical


it may be con-
e liquid range.
point for HEDO


lies


between


the critical


points


of H20 and D20.


TABLE


VAPOR PRESSURE OF H20 AND HDO


Pressure,
psia.


219.40


325.97
367.54


1607.7
3017.5
3143.3
3144.1


Boiling Points,
HUo
-2


184.57
198.68
208.00
218.34
224.66
231.95
238.41
243.28
254.24
318.62
369.01


tOc.
HDO


184.78
198.81
208.08


224.64
231.89


254.05
318.09
368.04


372.45


AT (H20 HDO),
*c.


-0.216
-0.132
-0.084
-0.023
0.018
0.058
0.102
0.126
0.187
0.532
0.969
1.164
1.152


472.14









BIBLIOGRAPHY


Kirshenbaum,


Physical Properties


and Analysis


of Heavy Water,


First Ed., New York,


McGraw-Hill,


1951,


. 396.


Oliver,
DO andr
Carbide
(K-87).


G. D.,
Vapor


Grisard,
Pressure


and Carbon Chemicals


J. W., Milton, H. T., The
Difference of D00 and HoO,


Company,


K-25 Plant,


Vapor


Pressure of


From 200 to


March 12,


37T'C.,


NOTEBOOK REFERENCES


Oliver,


K-25 Notebook No.


1764,


- 85.


Experimental


work completed November


1952.


OPD B22224


1952




UNIVERSITY OF FLORIDA

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