Abstract
The permeabilities to pure gases can be directly used in the calculation of mixed gas permeation through a rubbery membrane (silicone rubber), but the permeabilities of cellulose acetate membranes to mixed gases are considerably affected by the presence of hydrocarbons. The efficiency of separation increases with decreasing pressure ratio and reaches a maximum when the pressure ratio becomes zero. The enrichment of the less permeable gas can be easily achieved in a stripper. Combining two strippers made out of two different membranes, highly concentrated products (99%) are continuously obtained at both ends of the column. As a result, the overall separation factors are greatly increased.
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