CO2/CH4 gas sorption behavior of glassy polymeric membranes based on Dual mode sorption model

The thermodynamic interaction (sorption effects) has the major role in the diffusivity, permeability, and selectivity of the membrane in the field of gas separation via glassy polymeric membrane. In glassy polymers, dual-mode sorption model is frequently used to describe the equilibrium sorption behavior of a polymer-gas system. In this study, the difference between the sorption mechanism of CO2 and CH4 in glassy polymeric membranes was analyzed by separating the sorption mode and introducing P50/50 parameter (the pressure at which the contribution of both Henry and Langmuir sorption is equal), which was done using the available experimental data in the scientific references for the sorption values of CO2 and CH4. The contribution of the sorbed molecules in Henry and Langmuir sites was investigated and its changes with pressure were evaluated for CO2 and CH4 permeation