EP0179474A2
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Gas separation membrane and process for preparing it
Assignee: EIDP Inc
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Filing: 1985-10-24
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Granted: —
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Expires: 2005-10-24
Abstract
Abstract A gas separation membrane and its preparation is disclosed. The membrane is an aromatic polyamide or amide-like polymer which has been treated with a dilute solution of a cationic surfactant in a volatile non-polar organic solvent.
Inventors
- 👤 Philip Manos
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 04:45
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0088; B01D67/0093; B01D67/00933; B01D71/00; B01D71/06; B01D71/56; B01D71/58
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
145 words
A process for preparing a gas separation membrane comprising treating the dense side of an anisotropic membrane formed of a polymer containing repeating units of the formula A-B where -A- is an aromatic moiety of the structure N alkyl, N phenyl and mixtures of the above, -R is an alkyl group containing 1 to 5 carbon atoms, -R' is -H or an alkyl group containing 1 to 5 carbon atoms, and n and m are 1-3; and -B- is a linking group of the structure . or with a dilute solution of a cationic surfactant in a volatile non-polar organic solvent having a surface tension below about 25 dyn. cm 1 and removing the organic solvent from the membrane whereby a membrane having an improved selectivity to separating two gases selected from the group consisting of C0 2 , CH 4 and He is produced.
Claim 2
Dependent Claim
145 words
A process for preparing a gas separation membrane comprising treating the dense side of an anisotropic membrane formed of a polymer containing repeating units of the formula A-B where -A- is an aromatic moiety of the structure N alkyl, N phenyl and mixtures of the above, -R is an alkyl group containing 1 to 5 carbon atoms, -R' is -H or an alkyl group containing 1 to 5 carbon atoms, and n and m are 1-3; and -B- is a linking group of the structure . or with a dilute solution of a cationic surfactant in a volatile non-polar organic solvent having a surface tension below about 25 dyn. cm 1 and removing the organic solvent from the membrane whereby a membrane having an improved selectivity to separating two gases selected from the group consisting of C0 2 , CH 4 and He is produced.
Claim 3
Dependent Claim
49 words
The process of Claim 1 wherein the membrane is formed of an aromatic polyamide derived from a 50:50 to 80:20 mixture of isophthalyl chloride and terephthalyl chloride, and meta-phenylenediamine which may be substituted with a sulfonic acid group, said polyamide containing from 0 to 4.5 percent by weight sulfur.
Claim 4
Dependent Claim
76 words
The process of Claim 1 wherein the cationic surfactant has the formula where -R 1 is a C 10-20 alkyl or alkenyl group, -CH 2 CH 2 C n F 2n+1 where n is an integer from 8 to 20, or where m is an integer from 8 to 20 and -R 2 and -R 3 are -CH 3 or -R 1 , and X - is Cl - , Br - or I - .
Claim 5
Dependent Claim
90 words
An anisotropic permeation membrane formed of a polymer containing repeating units of the formula A-B where -A- is an aromatic moiety of the structure where X is O, S, N alkyl, N phenyl and mixtures of the above, -R is an alkyl group containing 1 to 5 carbon atoms, -R' is -H or an alkyl group containing 1 to 5 carbon atoms, and n and m are 1-3; and -B- is a linking group of the structure or - having ionically bonded thereto on the dense side a cationic surfactant.
Claim 6
Dependent Claim
90 words
An anisotropic permeation membrane formed of a polymer containing repeating units of the formula A-B where -A- is an aromatic moiety of the structure where X is O, S, N alkyl, N phenyl and mixtures of the above, -R is an alkyl group containing 1 to 5 carbon atoms, -R' is -H or an alkyl group containing 1 to 5 carbon atoms, and n and m are 1-3; and -B- is a linking group of the structure or - having ionically bonded thereto on the dense side a cationic surfactant.
Claim 7
Dependent Claim
51 words
The gas permeation membrane of Claim 4 wherein the membrane is formed of an aromatic polyamide derived from a 50:50 to 80:20 mixture of isophthalyl chloride and terephthalyl chloride, and meta-phenylenediamine which may be substituted with a sulfonic acid group, said polyamide containing from 0 to 4.5 percent by weight sulfur.
Claim 8
Dependent Claim
78 words
The gas permeation membrane of Claim 5 wherein the cationic surfactant has the formula where -R 1 is a C 10-20 alkyl or alkenyl group, -CH 2 CH 2 C n F 2n+1 where n is an integer from 8 to 20, or where m is an integer from 8 to 20 and -R 2 and -R 3 are -CH 3 or -R 1 , and X - is Cl - , Br - or I - .
References Cited (Backward Citations)
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