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Multicomponent adsorption and chromatography with uneven saturation capacities
Author(s) -
Gu Tingyue,
Tsai GowJen,
Tsao George T.
Publication year - 1991
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690370906
Subject(s) - saturation (graph theory) , sorption isotherm , adsorption , langmuir adsorption model , thermodynamics , crossover , chemistry , selectivity , chromatography , mathematics , organic chemistry , physics , computer science , combinatorics , artificial intelligence , catalysis
In chromatographic separations involving elutes with large differences in the molecular size, the adsorption saturation capacities of the elutes may differ because of the differences in the degree of size exclusion. With uneven saturation capacities, isotherm crossovers may occur, which often results in selectivity reversal. In this work, a new multicomponent isotherm has been developed for this kind of system. The isotherm is an extension of the common multicomponent Langmuir isotherm and introduces no or a very limited number of new parameters for its construction. The isotherm crossover conditions have also been derived. Simulations based on a general rate model using the new isotherm have successfully demonstrated the phenomena of peak reversal and crossover of breakthrough curves.