Asymmetric gas separation membranes having improved strength

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

1989-09-27

1991-05-07

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

21050023, 21050041, 521 61, 524609, C08J 928

Patent

active

050137670

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.

REFERENCES:
patent: 3133132 (1964-05-01), Loeb et al.
patent: 3886066 (1975-05-01), Chen et al.
patent: 4163725 (1979-08-01), Sano et al.
patent: 4200726 (1980-04-01), Ishii et al.
patent: 4230463 (1980-10-01), Henis et al.
patent: 4292417 (1981-09-01), Ishii et al.
patent: 4319008 (1982-03-01), Marze et al.
patent: 4612119 (1986-09-01), Eguchi
patent: 4629563 (1986-12-01), Wrasidlo
patent: 4695383 (1987-09-01), Konagaya et al.
patent: 4840819 (1989-06-01), Williams et al.
patent: 4865785 (1989-09-01), Zwick
patent: 4871494 (1989-10-01), Kesting et al.
patent: 4874522 (1989-10-01), Okamoto et al.
patent: 4880441 (1989-11-01), Kesting et al.
patent: 4882057 (1989-11-01), Morgan
patent: 4894159 (1990-01-01), Guiver et al.
patent: 4902422 (1990-02-01), Pinnau et al.
patent: 4906375 (1990-03-01), Heilmann

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