Abstract
Reverse osmosis separation of ethanol from the system ethanol-water by cellulose acetate and styrene-grafted cellulose acetate membranes at various operating conditions is discussed. Styrene was grafted onto the cellulose acetate chain by γ,-irradiation of a styrene-containing casting solution in the dose level range 0.25-3.0 Mrad and at styrene concentrations in the range 10-50% (on a cellulose acetate basis). Grafted membranes were found to be superior to ordinary cellulose acetate membranes in terms of chemical resistance and separation properties. Polystyrene content in the casting solution and γ-irradiation dose level both affected membrane properties. Operating pH affected both separation efficiency and flux whereas temperature did not significantly affect separation.
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