Selective Transport of Sulfur Dioxide through Polymer Membranes. 1. Polyacrylate and Cellulose Triacetate Single-Layer Membranes

Abstract

Commercial samples (75-250 µ thick) of polyacrylate and cellulose triacetate polymers were found to be selectively permeable to S02. Ultrathin films (0.05-10 µ thick) of these polymers were prepared to achieve the high S02 fluxes which are required for S02 gas separations. The results of tests with pure N2, C02, and S02 showed that N2 and C02 permeabilities were nearly independent of pressure but the S02 permeability had a large pressure dependence which adversely affected membrane performance. S02 permeation data were correlated with twoand three-parameter exponential models. The effects of membrane thickness, additives, and time on permeability were also investigated.

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