13.7. DERIVATION OF EQUATIONS FOR COUNTERCURRENT AND COCURRENT FLOW FOR GAS SEPARATION FOR MEMBRANES
13.7A. Concentration Gradients in Membranes
1. Dense-phase membrane
In gas separation using a dense-phase symmetrical polymer membrane, the solute diffuses through the high-pressure-side gas film to the membrane surface. Then it dissolves in the membrane. At the interface equilibrium occurs. The solute then diffuses through the solid membrane, and finally diffuses through the gas film. The gas film resistances are quite small and can be neglected (N1). In Fig. 13.7-1a the concentration profiles are shown. The concentration y in the flowing bulk gas phase is the same as y at the interface of the dense polymer and depends on the flow pattern of ...
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