Membranes of bisphenol - af, polycarbonates and polyestercarbonates for gas separation.

摘要

The invention relates to a gas separation membrane comprsing a thin discriminating layer of bisphenol AF polycarbonate or polyestercarbonate. PPThe invention further relates to a method of separating gases comprisingPP(a) contacting with a feed gas mixture under pressure one side of a semi-permeable membrane comprising a thin discriminating layer of polycarbonate or polyestercarbonate, wherein the diphenolic residue in the polymer backbone is based on bisphenol AF; P P(b) maintaining a pressue differential across the membrane under conditions such that a component(s) of the feed gas selectively permeates through the membrane from the high pressure side to the low pressure side of the membrane; PP(c) removing the permeated gas which is enriched in the faster permeating component(s) from the low pressure side of the membrane; PP(d) removing the nonpermeated gas which is depleted in the faster permeating component(s) from the high pressure side of the membrane.