Asymmetric gas separation membranes having improved strength

Details Asymmetric gas separation membranes having improved strength Asymmetric gas separation membranes having improved strength

B - Operations, Transporting

01

D

18/15, 400/7024

B01D 69/08 (2006.01) B01D 67/00 (2006.01) B01D 71/00 (2006.01) D01D 5/24 (2006.01)

Patent

CA 2026242

36-21(10004)A ASYMMETRIC GAS SEPARATION MEMBRANES HAVING IMPROVED STRENGTHABSTRACT OF THE DISCLOSURE ABSTRACT A dope for forming membranes and the resulting asym- metric 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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