Group Title: use of a mathematical model in the computer control of an industrial distillation tower
Title: The Use of a mathematical model in the computer control of an industrial distillation tower
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 Material Information
Title: The Use of a mathematical model in the computer control of an industrial distillation tower
Physical Description: xii, 131 leaves. : ill. ; 28 cm.
Language: English
Creator: Wengrow, Henry Ray, 1938- ( Dissertant )
May, F. P. ( Thesis advisor )
Schweyex, H. E. ( Reviewer )
Ash, W. O. ( Reviewer )
Martin, R. ( Reviewer )
Publisher: University of Florida
Place of Publication: Gainesville, Fla.
Publication Date: 1966
Copyright Date: 1966
Subjects / Keywords: Plate towers   ( lcsh )
Chemical Engineering thesis Ph. D   ( local )
Distillation, Fractional -- Automation -- Mathematical models   ( lcsh )
Dissertations, Academic -- Chemical Engineering -- UF   ( local )
Genre: bibliography   ( marcgt )
non-fiction   ( marcgt )
Abstract: In this investigation a mathematical model of a continuous stage-wise distillation column was derived. A convergence technique was developed to solve the mathematical model with the use of a digital computer. Experimental data from an industrial column was used to verify the accuracy of the model to simulate plant conditions. The mathematical model was then modified so that it could be used to predict the steady-state control points to maintain composition quality in one of the product streams of this column. This control model was then used to control a tower in a tall oil production unit. The mathematical model consists of steady-state material and energy balances around the upper and lower sections of the fractionating column after the method of Sorel. The convergence method uses a ratio of feed plate compositions, as computed from the top and bottom, raised to a power in order to adjust the top and bottom compositions for the next trial. Convergence is reached when the ratio equals one. The control model convergence technique adjusts overheads flow rate in order to maintain constant composition in the sidestream during the convergence procedure. An IBM 1620/1070 computer system was programmed with the control model and linked to an industrial tall oil fatty acid fractionating column. Vapor phase chromatograph analyses of the feed stream were entered into the computer at regular intervals and the model then predicted external flow rates necessary to maintain constant product composition in the sidestream. A 1 per cent increase in yield of the main product resulted from this control. This would produce a financial return of $10,000 a month for the average tall oil plant with a throughput of 10,000 tons per month. On the basis of this work, several conclusions may be made: It is possible to write a theoretical description of an actual industrial distillation column with sufficient accuracy to allow its control by a digital computer. It is not always necessary to have all physical data completely defined before a model may be used, but actual operating data may be used to fill the gaps in our knowledge. The power ratio convergence technique ha's proved itself to be a useful method in the solution of steady-state distillation calculations and should have applications in other types of trial and error calculations .
Thesis: Thesis -- University of Florida.
Bibliography: Bibliography: leaves 86-88
Additional Physical Form: Also available on World Wide Web
General Note: Manuscript copy.
General Note: Vita.
 Record Information
Bibliographic ID: UF00097885
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: alephbibnum - 000568460
oclc - 13663006
notis - ACZ5194


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