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In this research, solubility, permeability and diffusivity of gas mixtures are comprehensively studied through the glassy polymers. Diffusivity of components in the mixture is assumed to be a function of the concentration of all components in the mixture. Then, the permeability of pure species is expanded to the gas mixtures and for checking the validity, the model fitted to the experimental data for permeation of CO 2 /CH 4 through different glassy membranes and the parameters of the model are calculated. Afterwards, the obtained parameters are used for predicting permeability of CO 2 and CH 4 in the mixture. The results show that solubility, diffusivity, and also permeability of CO 2 in the glassy polymers are suppressed in the presence of CH 4 as well as plasticization. Moreover, the diffusivity ( D ) for pure CO 2 is significantly pressure dependent in the presence of plasticization whereas with the increase in the CH 4 fraction, this dependency decreases due to the reduction in the plasticization.

Permeability of gas mixtures in glassy polymers with and without plasticization