rd-design-paper-2003 - Graphical and Stage-to-Stage Methods...

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Graphical and Stage-to-Stage Methods for Reactive Distillation Column Design Oscar Sanchez Daza ´ Dept. de Ingenierıa de Procesos e Hidraulica, Universidad Autonoma Metropolitana-Iztapalapa, ´´ ´ Mexico, D.F., C.P. 09340 ´ and Centro de Quımica, Instituto de Ciencias de la Universidad Autonoma de Puebla, Mexico ´ Eduardo S. Perez-Cisneros ´ Dept. de Ingenierıa de Procesos e Hidraulica, Universidad Autonoma Metropolitana-Iztapalapa, ´ Mexico, D.F., C.P. 09340 ´ Erik Bek-Pedersen and Rafiqul Gani CAPEC, Dept. of Chemical Engineering, Technical University of Denmark, 2800, Lyngby, Denmark Based on the element mass-balance concept, three graphical methods and one stage- to-stage computation method for design of reacti ® e distillation columns ha ® e been de - ® eloped. The element-based approach allows the design of reacti ® e distillation columns by using simple tools similar to those that are typically employed for nonreacti ® e sys - tems. For example, simple design methods employing reacti ® e McCabe-Thiele- and re - acti ® e Ponchon-Sa ® arit-type diagrams for design of reacti ® e distillation of binary-ele - ment systems } which may be ternary or higher in terms of mixture compounds } are presented. Also, the dri ® ing-force approach has been extended to employ the element concept for reacti ® e systems. For multielement systems, the design is performed by em - ploying a stage-to-stage computation method. For combined reacti ® e distillation columns, comprising both reacti ® e and nonreacti ® e stages, a simple design strategy is proposed, based on the stage-to-stage computation method considering reacti ® e and nonreacti ® e bubble-point calculations. This strategy tracks the con ® ersion or generation and temperature between the feed and the end stages of the column, and indicates when and where nonreacti ® e stages should be added to a reacti ® e distillation column in order to achie ® e the desired separation. Illustrati ® e examples highlight the application of the design methods, as well as the ® erification of such designs through rigorous simulation. Introduction In recent years, reactive distillation has become a highly promising hybrid process for many combined reaction ] sep- arations schemes. The application of this combined reaction ] separation process has been considered to be useful only for reactive systems limited by chemical equilibrium, and it has been applied successfully to methyl acetate and Ž. Ž methyl- tert -butyl ether MTBE production Agreda et al., . 1990; Smith and Huddleston, 1982 . However, it has recently Correspondence concerning this article should be addressed to R. Gani. been claimed Perez-Cisneros et al., 2002 that reactive distil- ´ lation also may be applicable to processes involving complex nonequilibrium limited reactive systems, such as diesel and gasoline hydrodesulfurization.
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This note was uploaded on 11/20/2009 for the course CHME DTU-abroad taught by Professor Rafiqulgani during the Fall '09 term at Rensselaer Polytechnic Institute.

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rd-design-paper-2003 - Graphical and Stage-to-Stage Methods...

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