Composite gas separation membranes from perfluoropolymers
OwnerBenjamin Bikson, Yong Ding +1inventors
InventorsBenjamin Bikson, Yong Ding, Joyce Katz Nelson
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Abstract
Improved composite gas separation membranes from perfluoropolymers are disclosed. The membranes are formed by depositing an ultrathin, dense separation layer of a soluble amorphous perfluoropolymer on top of a porous polyethersulfone substrate. The membranes are particularly useful for the separation and recovery of volatile organic hydrocarbon vapors.
Claims23
A process for separating a fast permeating gas from a mixture containing a volatile organic hydrocarbon (VOC), the process comprising the steps of (a) bringing said gaseous mixture into contact with a feed side of a composite gas separation membrane;
- (b) providing a partial pressure differential between the feed side of the membrane and a permeate side of the membrane, such that a portion of said gas mixture permeates through the membrane;
- (c) collecting a portion of said gas mixture as a permeate gas, said permeate gas being enriched in the fast gas component and depleted in the volatile organic hydrocarbon;
- and (d) collecting a portion of said gas mixture as a nonpermeate gas wherein said nonpermeate gas is depleted in the fast gas component and enriched in the volatile organic hydrocarbon, wherein said composite gas separation membrane has a selective layer formed from a perfluopolymer and a porous support formed from a polyethersulfone.
Dependencies are inferred from the claim text.