Variable-Volume Operation of a Stirred Tank Reactor

Lund, Monty W.; Seagrave, Richard C.

doi:10.1021/i160039a024

Cited by 16 publications

(4 citation statements)

References 14 publications

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“…A comparatively minor segment of the semibatch cycle spent in reactor filling changes reactor performance radically. Lund and Seagrave (1971b) discuss these effects for first-order reactions. Since the semibatch cycle simulates a level of mixing between the plug flow and CSTR reactors, it is similar in some respects to a plug flow reactor with recycle.…”

Section: Discussionmentioning

confidence: 99%

“…Intermediate levels of mixing were simulated using a plug flow reactor model with recycle. Lund and Seagrave (1971b) also investigated the Van de Vusse reactions and simulated intermediate levels of mixing using semibatch operation. They presented their findings along with part of the original work done by Van de Vusse (1964) on a graph whose two coordinates are formed from ratios of the feed composition and reaction rate constants of the three reactions.…”

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confidence: 99%

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Optimization of Van de Vusse Reaction Kinetics Using Semibatch Reactor Operation

Ridlehoover¹,

Seagrave²

1973

Ind. Eng. Chem. Fund.

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Methods of semibatch or periodic reactor operation needed to maximize the yield of the desired intermediate species in the Van de Vusse chemical reactions are presented. The operating parameters of the stirred-batch reactor in the kinetic region where semibatch operation is superior to both plug-flow and continuous operation are determined and are given as a function of the ratios of the associated kinetic rate constants. Digital simulation techniques are employed to investigate the range of operating and kinetic conditions likely to be encountered. The methods employed are easily extendable to other reaction schemes.Cyclic operation of a stirred tank chemical reactor in such a manner

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Optimization of Van de Vusse Reaction Kinetics Using Semibatch Reactor Operation

Ridlehoover¹,

Seagrave²

1973

Ind. Eng. Chem. Fund.

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“…This greatly simplifies the analysis of semibatch operation, and it does not severely restrict the number of possible operating policies. Lund and Seagrave (1971) have shown that, with a first-order reaction, the optimum conversion occurs with equal filling and emptying times. After the cycle has been repeated a sufficient number of times, the reactor reaches a quasi-steady state and the reactor variables become periodic.…”

Section: Semibatch Operationmentioning

confidence: 99%

“…Isothermal and adiabatic SBO reactors were analyzed by Lund and Seagrave (1971), who compared the semibatch yield to that of a reference CSTR with the same maximum volume and throughput of material. For an isothermal first-order reaction they showed that the optimal semibatch policy is one in which the minimum volume is zero and the time in the batch mode is as large as possible.…”

Section: Introductionmentioning

confidence: 99%

Mixing Effects in Variable-Volume Chemical Reactors

Roth¹,

Basaran²,

Seagrave³

1979

Ind. Eng. Chem. Fund.

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Synthesis of optimal serial reactor structures for homogeneous reactions. Part I: Isothermal reactors

Chitra

Govind

1985

AIChE Journal

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The reactor synthesis problem can simply be stated as follows: Given the reaction mechanism and kinetics, what is the optimum type and arrangement of the reactor(s) that would maximize product yield? Extensive studies for simple reaction systems (series, parallel, consecutive, etc.) using idealized plug flow and continuous stirred tank reactors have been presented in the literature. However, these studies fail to provide a systematic procedure for selecting the reactor(s) type and the arrangement for complex reaction schemes.In this paper simple rules with geometrical interpretations have been developed for synthesizing isothermal reactor configurations for complex reaction schemes. A computer program capable of specifying the optimum reactor structure from a generalized configuration has also been described. SCOPEWhat is the optimum type(s), arrangement, and size of the reactods) that would maximize product yield for a given reaction mechanism? This is the essence of the reactor synthesis problem in the chemical process industry.Previous studies in the reaction engineering field have resulted in some guidelines for simple reactions. These rules and their limitations have been presented in this paper. However, these studies fail to provide a systematic procedure for selecting the reactor(s) type and the arrangement for complex reaction schemes.This paper is the first in a two-part series which attempts to classify reaction schemes into three basic types. Simple rules with geometrical interpretations have been presented for Type I1 reactions and a synthesis computer program has been described for Type 111 reactions. These rules are limited to isothermal reactor systems only. Non-isothermal studies will be presented in Part I1 of this paper. CONCLUSIONS AND SIGNIFICANCEIn this paper reaction schemes have been classified into three basic types based on the kinetic equations: Type I (simple reactions), and Types I1 and I11 (complex reactions).Simple rules for Type I reactions have been presented in this paper. These rules are based on previous studies by Denbigh (196l), Carberry (1966), and others. Rules have been derived for several serial reactor configurations for Type I1 reactions. Geometrical interpretations for these rules have been presented to provide an understanding of the mathematics involved. Fi-nally, for Type I11 reactions, a computer program has been discussed which is capable of specifying the reactor type(s), arrangement, and size for a given reaction mechanism.This work is significant in that it is the first attempt to develop rules for synthesizing reactor configurations for complex reaction schemes. It provides a methodology for specifying the optimum structure of the reactor system for complex reactions which would be necessary in the synthesis and development of chemical process flowsheets.The design of chemical Process reactors has been recognized for a 10% time as an important and difficult Problem, because in-Correspondence concerning this paper should be addressed to Rakesh Govind process an...

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Variable-Volume Operation of a Stirred Tank Reactor

Cited by 16 publications

References 14 publications

Optimization of Van de Vusse Reaction Kinetics Using Semibatch Reactor Operation

Optimization of Van de Vusse Reaction Kinetics Using Semibatch Reactor Operation

Mixing Effects in Variable-Volume Chemical Reactors

Synthesis of optimal serial reactor structures for homogeneous reactions. Part I: Isothermal reactors

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