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.
Claims5
A facilitated transport membrane comprising 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 wherein the silver (I) or copper (I) cation ion-exchanged or chelated carboxylic acid functional group containing polyimide comprises a plurality of repeating units of formula (I)
- wherein X1 and X2 are selected from the group consisting of
- and mixtures thereof, wherein X1 and X2 may be the same or different from each other;
- wherein Y1-COOM is selected from the group consisting of
- and mixtures thereof and wherein M is selected from a silver (I) cation or a copper (I) cation;
- wherein Y2 is selected from the group consisting of
- and mixtures thereof, —R′— is selected from the group consisting of
- and mixtures thereof, —R″— is selected from the group consisting of —H, COCH3, and mixtures thereof, M is selected from a silver (I) cation or a copper (I) cation;
- wherein n and m are independent integers from 2 to 500;
- and wherein n/m is in a range of 1:0 to 1:10.
Dependencies are inferred from the claim text.