Composite gas separation membrane having a gutter layer comprising a crosslinked polar phenyl-containing - organopolysiloxane, and method for making the same -
First Claim
1. 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.
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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.
144 Citations
25 Claims
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1. A composite gas separation membrane comprising:
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(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. - View Dependent Claims (2, 3, 4, 9, 10, 11, 23, 24, 25)
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- 5. The composite gas separation membrane of claim i in which the phenyl-containing-organopolysiloxane material comprises an effective amount of a silica-sol.
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12. A process for making a composite gas separation membrane comprising the following steps:
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(A) Providing a porous polyacrylonitrile structural support material having first and second surfaces, said first surface being a polyacrylonitrile surface; (B) Preparing a mixture comprising a polar phenyl-containing-organopolysiloxane, a crosslinker and a crosslinking catalyst; (C) Allowing the mixture to pre-cure but remain in an ungelled state; (D) Coating said first surface with said mixture and allowing said mixture to crosslink, constituting a gutter layer on the porous polyacrylonitrile structural support material, and leaving an uncoated gutter layer surface; and (E) Coating said uncoated gutter layer surface with an ultrathin 6FDA-type polyimide selective membrane layer, leaving an uncoated 6FDA-type polyimide selective membrane surface. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification