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Kinetics of sorption in bi‐porous molecular sieves — Part I. Mathematical models for systems with rectangular equilibrium isotherm
Author(s) -
Lee LapKeung,
Ruthven D. M.
Publication year - 1979
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.5450570110
Subject(s) - adsorption , microporous material , thermodynamics , sorption , porous medium , molecular sieve , diffusion , porosity , kinetics , macropore , phase (matter) , sorption isotherm , materials science , chemistry , chromatography , organic chemistry , physics , catalysis , mesoporous material , quantum mechanics
The coupled diffusion equations describing transport in a bi‐porous adsorbent (micropore‐macropore) have been solved in order to obtain the theoretical uptake curves for such a system when the adsorption equilibrium isotherm is rectangular. Solutions are presented for both the step change boundary condition generally encountered in adsorption from the gas phase and for the more complex case which is encountered in studies of adsorption from the liquid phase, when the composition of the ambient fluid changes significantly during the course of an experiment. The theoretical uptake curves are compared with the corresponding curves for a linear system.