Asymmetric gas separation membranes having improved strength
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United States of America Patent
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May 7, 1991
Grant Date -
N/A
app pub date -
Sep 27, 1989
filing date -
Sep 27, 1989
priority date (Note) -
Expired
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Abstract
A dope for forming membranes and the resulting asymmetric gas separation membranes are disclosed, the membranes having graded density skins which exhibit improved permeability characteristics and increased failure pressure strength. The membranes are produced from a process utilizing membrane forming dopes of complexing solvent systems formulated from two non-solvents and one or more solvents. The non-solvents are chosen one each, from non-solvents grouped according to non-solvent strength, i.e., one strong non-solvent and one weak non-solvent which are combined with one or more solvents in an acid:base complex solvent system for dissolving high weight percent total solids of membrane forming polymers. The process for forming the membranes is also disclosed.
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