Permeation of binary gas mixture through glassy polymer membranes with concentration‐dependent diffusivities

Abstract

Abstract An analytical solution has been obtained for the modified dual‐mode mobility model for a single gas proposed by Zhou and Stern and extended to a binary gas mixture to describe the pressure dependence of mean permeability coefficients for CO 2 and CH 4 mixtures in homogeneous cellulose triacetate membranes. The permeabilities calculated from the model fitted the corresponding experimental results quite well. Permeation experiments for equimolar CO 2 and CH 4 mixture in a homogeneous membrane of methyl methacrylate and n ‐sbutyl acrylate copolymer were performed along with sorption experiments for pure CO 2 and CH 4 to test the applicability of the model. The experimental permeabilities were close to those calculated from the model.