Gas separation membranes from bisphenol AF polycarbonates and polyestercarbonates
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United States of America Patent
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Oct 17, 1989
Grant Date -
N/A
app pub date -
Nov 20, 1987
filing date -
Nov 20, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a gas separation membrane comprsing a thin discriminating layer of bisphenol AF polycarbonate or polyestercarbonate. The invention further relates to a method of separating gases comprising (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; (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; (c) removing the permeated gas which is enriched in the faster permeating component(s) from the low pressure side of the membrane; (d) removing the nonpermeated gas which is depleted in the faster permeating component(s) from the high pressure side of the membrane.
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