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Theoritical analysis and simulation of five‐zone simulating moving bed for ternary mixture separation
Author(s) -
Khan H.,
Younas M.
Publication year - 2011
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.20485
Subject(s) - simulated moving bed , ternary operation , volumetric flow rate , chromatography , chemistry , mass transfer , separation (statistics) , flow (mathematics) , dispersion (optics) , mechanics , analytical chemistry (journal) , adsorption , mathematics , statistics , physics , computer science , organic chemistry , optics , programming language
In the present work a mathematical model has been presented to study the behaviour of five‐zone simulating moving bed (SMB) system for the separation of a ternary mixture of certain amino acids. These are methionine, phenylalanine and tryptophan, possessing linear isotherms values. Safety margin method has been used to design the SMB system while triangle theory became the basis to calculate the operating conditions at fixed feed flow rate. It was found that for same safety factor ( β ) value in each zone, increase in β value causes the purity values of all product streams to increase up to a definite value. Further increase in β value shows the effect of decrease in separation efficiency, because of dominance of axial dispersion and mass transfer resistances. The effect of zone safety factor (zone flow rate β II , β III and β IV ) values on the separation performance of five‐zone SMB have also been investigated which remained an important issue in SMB current research. Increase in β II value results in rising tryptophan purity, phenylalanine purity improves due to increase in β III value and increase in β IV value becomes the basis for enhancing methionine purity. In column profile study, the solute concentration profile diminishes due to increase in particular separation zone safety factor value. This happened due to low column switching time with high desorbent flow rate to the system. The developed mode was run in Aspen Chromatography vis 12.1. (2004) simulator for simulation studies.