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Beckman I. N., Bessarabov D. G., Sanderson R. D.
Separation of the Gas Mixtures by the Absorption Module
of the Membrane Contactor
Abstract
Selective gas
diffusion in the absorption module of the membrane contactor containing
flat-sheet non-porous polymeric membrane and flowing liquid carrier are
considered in this paper. The theoretical basis of membrane permabsorber with
both membrane and liquid absorbent non-specific with respect to the separated
binary gas mixture gas mixture separation are discussed. Computer simulation of
the separation process in the absorption module of the membrane permabsorber
continuous-flow type was carried out. The mathematical modeling included use of
the following variables: diffusion coefficients of gases in a polymeric
membrane, solubility of gases in polymeric membranes and sorption of gases in
flowing liquid, feed-gas and liquid volume flow-rates. The following
dependencies has been computed: concentration profiles of gas mixture
components along the absorber vc. liquid and feed flow rates, local separation
factor vc. liquid and feed flow rates, product concentrations in system outlet
(retentate), vc. liquid and feed flow rates, and the retentate separation
factors vc. liquid and feed flow rates. It was found that the proposed model
can be used effectively for the simulation of gas separation process in the
small-scale membrane contactors. It was also shown that the counter-mode of
operation is advantageous in comparison to the co-current mode. By varying the
flow rate of the liquid and/or gases, achievement of compromise between
productivity, cleanliness products and stability of gas separation process is
possible.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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