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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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17.3 Gas Permeation

We will consider gas permeation first, since, in addition to being commercially important, in many ways these systems are closest to being ideal. Once the ideal operation is understood, we can look at deviations from ideality for other membrane separations. Gas permeation membrane systems are used commercially for separation of permanent gases. Some common applications are purification of helium, hydrogen, and carbon dioxide, production of high purity nitrogen from air, and production of air enriched in oxygen (low purity oxygen).

Gas permeation systems typically use hollow-fiber or spiral-wound membranes, although hollow-fiber systems are more common (Baker, 2004). Cellulose acetate membranes are used for carbon dioxide ...

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