High performance facilitated transport membranes for olefin/paraffin separations
OwnerChunqing Liu, Nicole K. Karnsinventors
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Abstract
A high performance facilitated transport membrane comprising a metal cation exchanged/chelated carboxylic acid functional group containing functional polyimide, a method of making this a membrane, and the use of this membrane for olefin/paraffin separations, particularly for propylene/propane and ethylene/ethane separations. The facilitated transport membrane has either an asymmetric integrally skinned membrane structure or a thin film composite membrane structure, wherein the top selective layer of the membrane comprises a metal cation exchanged/chelated carboxylic acid functional group containing functional polyimide.
Claims9
An olefin/paraffin separation process comprising:
- (a) contacting a first surface of a membrane with an olefin/paraffin feed, wherein said membrane comprises a carboxylic acid functional group containing polyimide wherein the carboxylic acid functional groups are ion-exchanged or chelated with silver (I) or copper (I) cations;
- (b) causing a permeate to flow through said membrane and from a second surface of said membrane wherein the permeate has a higher concentration of olefin than said olefin/paraffin feed;
- and
- (c) removing a retentate from said first surface of said membrane wherein the retentate has a lower concentration of olefin than the permeate and wherein the retentate has a higher concentration of paraffin than the permeate.
Dependencies are inferred from the claim text.