Gas separation transport modeling for PDMS coatings on PEI-PEG IPN membranes

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Journal titleJournal of membrane science
IssueSeptember 1-2
Pages176181; # of pages: 6
SubjectGas separation; Bi-layer system; CFD; Selectivity; Modeling; Simulation
AbstractA caulking layer is frequently applied to gas separation membranes to alleviate the effects of structural defects. Caulking materials have high gas diffusivities, so as not to hinder the performance of the gas separation layer. Despite these considerations, for some bi-layer systems unaffected by plasticization, the mixed gas selectivity has been observed to be significantly lower than selectivity values calculated from pure gas permeabilities. The present object is to model and simulate two-layer caulked gas separation membranes at the fundamental level to discover the mechanistic basis for the observed behaviour. To this end, a transport based model considering intrinsic material properties was developed to simulate gas separation for a system of CO2 and N2 diffusing across a caulking layer of polydimethyl siloxane (PDMS) and then a polyetherimide-polyethylene glycol interpenetrating network (PEI-PEG IPN) membrane. The model was able to account for flux declines in mixed gas systems greater than those predicted by conventional series resistance models, such as have been observed experimentally.
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AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Chemical Process and Environmental Technology
Peer reviewedYes
NRC number52200
NPARC number16352291
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Record identifier162e8f0c-f613-4658-8a04-1c858451c5ef
Record created2010-11-09
Record modified2016-05-09
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