Optimum performance of combined flow reactors under adiabatic conditions

Cholette, A.; Blanchet, J.

doi:10.1002/cjce.5450390504

Cited by 32 publications

(14 citation statements)

References 15 publications

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“…Cholette and Blanchet (9) were probably the first to study series reactor combinations under adiabatic operating conditions. They found that for isothermal and endothermic reactions the plug flow reactor always gives a greater conversion than a series combina tion of the CSTR and plug flow reactor.…”

Section: Purposementioning

confidence: 99%

Variable-Volume Operation of a Stirred Tank Reactor

Lund¹,

Seagrave²

1971

Ind. Eng. Chem. Fund.

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Generalized results for relative yield and relative throughput are presented for the semibatch operation of a stirred tank reactor for both isothermal and adiabatic operation. A special case of continuous variablevolume operation is examined. Reaction mechanisms investigated include irreversible firstand second-order, reversible first-order, and consecutive and competing reactions. It is shown that under certain conditions semibatch operation can produce yield, throughput, and selectivity improvement over continuous operation and, in some instances, over batch or plug flow operation.I n recent years interest in the periodic operation of chemical reactors as a means of improving yield over optimum steadystate operation has been increasing rapidly. Periodic operation in this context refers to the situation in which some of the output or input variables of a reactor are periodic functions of time. The variable-volume STR is a special case of the periodic operation of a chemical reactor.

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Section: Purposementioning

confidence: 99%

Variable-Volume Operation of a Stirred Tank Reactor

Lund¹,

Seagrave²

1971

Ind. Eng. Chem. Fund.

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“…Combinations of PFR and CSTR for irreversible first and second order reactions under endothermic and exothermic adiabatic conditions also have been studied (Cholette and Blanchet, 1961). Aris (1961~) has optimized combination of reactors for simple reaction schemes using dynamic programming.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of optimal serial reactor structures for homogeneous reactions. Part II: Nonisothermal reactors

Chitra

Govind

1985

AIChE Journal

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In Part I of this paper a methodology for the synthesis of optimal isothermal serial reactor structures for complex reactions was presented. This has been extended to nonisothermal systems in this paper.A complete review of the relevant background has been included in this paper. A graphical procedure has been presented for Type I1 complex reactions and a computer program has been described for Type I11 complex reactions. Two cases for the Van de Vusse reaction scheme and a naphthalene oxidation example have been used to illustrate the synthesis approach. S. P. CHITRA and RAKESH GOVIND SCOPEThe objective of this research is to find rules and procedures which could be used in specifying the type and arrangement of reactods) to maximize product yield for complex reactions. In Part I of this paper the methodology presented was limited to isothermal systems. In this paper a methodology has been described for the synthesis of serial nonisothermal reactor SYSterns. CONCLUSIONS AND SIGNIFICANCEIn Part I of this paper reactions were classified into three basic types. Type I reactions were called simple reactions, and Types I1 and I11 were denoted complex reactions.From a literature review summarized in this paper, it has been concluded that the rules presented in the literature for adiabatic and nonadiabatic reactor systems are only applicable for simple reactions and in general are not valid for complex reactions.For Type I1 complex reactions a graphical procedure has been INTRODUCTIONIn Part I of this paper a synthesis strategy was proposed for obtaining the optimum serial reactor structure consisting of isothermal reactors, for a Type I1 complex reaction scheme. An optimization strategy and a computer program was also described for obtaining an optimum serial reactor structure for Type 111 complex reactions.As noted in Part I, the objective of our research is to find rules and procedures which could be used in specifying the type and arrangement of the reactor(s) to maximize product yield for complex reactions.Conespndence concerning this paper should he addressed to Rakesh Govind.AlChE Journal (Vol. 31, No. 2) presented for obtaining the optimum temperature profile. Analytical results for obtaining the optimum serial reactor structure have been derived for Type I1 complex reactions. These results have been explained graphically in the form of a stepping procedure described in this paper.For Type I11 reactions an optimization procedure based on the modified complex method has been used to obtain the optimal serial reactor structure. The dominant eigenvalue method is used to converge the calculations.In this paper, the methodology presented earlier for isothermal serial structures will be extended to nonisotherrnal reactor systems.Although preliminary decisions can be made concerning operating temperature and reactor type based on isothermal operation, ultimately it is important to analyze the nonisothermal nature of the system. All industrial reactions are either exothermic or endothermic, and the associated heat eff...

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“…Aris (l) quantitatively demonstrated a basis for selection of the combination to use for maximum conversion. As a single adiabatic reaction unit, Cholette and Blanchet (6) showed that for an endothermic reaction, the same situation existed as for an isothermal system in that a tubular reactor was superior. For an exothermic reaction, the choice of which reactor is superior is dependent upon the conversion range under consideration.…”

Section: Studies Of Adiabatic Reactors Have Been Made In Analogous Simentioning

confidence: 98%

“…Cholette and Blanchet (6) considered series combinations of tubular and mixed tank reactors. For exothermic reactions, a combination of types resulted in greater con version than either type of reactor alone.…”

Section: Studies Of Adiabatic Reactors Have Been Made In Analogous Simentioning

confidence: 99%

Dynamics of a nonisothermal imperfectly mixed tank reactor

Heng

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Optimum performance of combined flow reactors under adiabatic conditions

Cited by 32 publications

References 15 publications

Variable-Volume Operation of a Stirred Tank Reactor

Variable-Volume Operation of a Stirred Tank Reactor

Synthesis of optimal serial reactor structures for homogeneous reactions. Part II: Nonisothermal reactors

Dynamics of a nonisothermal imperfectly mixed tank reactor

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