Abstract
Membranes are also used for the separation of gas mixtures in various industrial sectors. The gas transport through the nonporous membrane is explained by the solution-diffusion model. Gas is dissolved in the membrane on the feed side, diffuses through the membrane, and is disengaged from the membrane on the permeate side. Thus, the permeability of gas through a nonporous membrane is the product of solubility and diffusivity, which can be obtained separately by the time-lag method. For multilayer gas separation membranes, the resistance model is useful to calculate the overall permeability and selectivity.
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