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Nonlinear Behavior of Coupled Reactor-Separator Systems with Azeotropic Vapor-Liquid Equilibriums (VLEs) : Comparison of Different Control Strategies

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Pushpavanam,  S.
Process Synthesis and Process Dynamics, Max Planck Institute for Dynamics of Complex Technical Systems, Max Planck Society;
Indian Institute of Technology, Chemical Engineering Department, 600036 Chennai (Madras), India;

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Zeyer,  K. P.
Process Synthesis and Process Dynamics, Max Planck Institute for Dynamics of Complex Technical Systems, Max Planck Society;

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Kienle,  A.       
Process Synthesis and Process Dynamics, Max Planck Institute for Dynamics of Complex Technical Systems, Max Planck Society;
Otto-von-Guericke-Universität Magdeburg, External Organizations;

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Citation

Vetukuri, S. R. R., Pushpavanam, S., Zeyer, K. P., & Kienle, A. (2006). Nonlinear Behavior of Coupled Reactor-Separator Systems with Azeotropic Vapor-Liquid Equilibriums (VLEs): Comparison of Different Control Strategies. Industrial and Engineering Chemistry Research, 45, 1019-1028. doi:10.1021/ie0502382.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0013-9AA9-B
Abstract
In this paper we discuss the behavior of a coupled reactor - separator system. The reactor is modeled as a CSTR sustaining an elementary first order reaction and the separator as a single stage flash unit. The coupling occurs via a recycle of the bottoms stream from the downstream separator to the upstream reactor. The emphasis in this paper is on studying the behavior of the coupled system when the VLE of the mixture has an azeotrope. Consequently the bottoms stream can be reactant rich or lean. Different control strategies for the operation of the reactor and separator are discussed. The stability of the steady states is analyzed analytically for each strategy. Physical explanation for the stabilty results are presented. In general, it is found that the recycle lean stream gives rise to instability. © 2006 American Chemical Society [accessed 2014 January 9th]