Composite gas separation membrane having a gutter layer comprisi

Details Composite gas separation membrane having a gutter layer comprisi Composite gas separation membrane having a gutter layer comprisi

1992-12-31

1994-02-15

Spitzer, Robert

Gas separation: processes

Selective diffusion of gases

Selective diffusion of gases through substantially solid...

95 47, 95 51, 95 53, 96 13, 4274121, B01D 5322, B01D 7164

Patent

active

052862801

ABSTRACT:
This invention provides a composite gas separation membrane comprising: (a) a porous polyacrylonitrile structural support material having a polyacrylonitrile surface; (b) a gutter layer coating comprising a crosslinked polar phenyl-containing-organopolysiloxane material on the polyacrylonitrile surface of the structural support material, leaving an uncoated gutter layer surface; and (c) an ultrathin 6FDA type polyimide selective membrane layer coating on the uncoated gutter layer surface. In preferred embodiments, the phenyl-containing-organopolysiloxane material additionally comprises a silica-sol. Processes for making the composite gas separation membrane and for using the membrane to carry out gas separations are also provided.

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