Claims
- 1. A process for improving the selectivity of a gas separation membrane selected from the classes of asymmetric and composite membranes that have a gas separating portion supported by a cellular structure, comprising applying to the surface of said gas separating portion of said gas separation membrane at least two monomers, each of which has a molecular weight of under 1,000 atomic units, causing said monomers to react with each other to form a polymer to improve the selectivity of the membrane for separating two or more gases.
- 2. The process of claim 1 wherein at least one of the monomers is selected from the group consisting of di- and triacyl halides, diisocyanates, and diglycidyl ethers; and at least one of the other monomers is selected from the group consisting of di- and triamines, and di- and triols.
- 3. The process of claim 2 wherein one of said monomers is an aromatic acyl chloride.
- 4. The process of claim 3 wherein said other monomer is an aromatic amine.
- 5. The process of claim 4 wherein the aromatic acyl chloride is selected from the class consisting of 1,3,5-benzenetricarboxylic chloride, isophthaloyl chloride, terephthaloyl chloride and mixtures thereof.
- 6. The process of claim 5 wherein the aromatic amine is selected from the class consisting of 2,4,6-trimethyl-1,3-phenylene diamine, diethyltoluene diamine, and 2,3,5,6-tetramethyl-1,4-phenylene diamine.
- 7. The process of claim 6 wherein the gas separation membrane is in the form of a hollow fiber.
- 8. The process of claim 7 wherein the gas separation membrane is an aromatic polyamide.
- 9. The process of claim 7 wherein the gas separation membrane is formed of an aromatic polysulfone.
- 10. The process of claim 8 wherein a material healed by reaction of the monomers has a higher intrinsic separation value than a material of the membrane.
- 11. The process of claim 3 wherein the amine is aliphatic.
- 12. The process of claim 11 wherein the acyl chloride is selected from the class consisting of 1,3,5-benzenetricarboxylic chloride, isophthaloyl chloride, terephthaloyl chlorides and mixtures thereof.
- 13. The process of claim 12 wherein the amine is selected from the class consisting of 4-methyl-1,5-pentane diamine, Tris(2-aminoethyl) amine, and mixtures thereof.
- 14. The process of claim 13 wherein the gas separation membrane is in the form of a hollow fiber.
- 15. The process of claim 14 wherein the gas separation membrane is an aromatic polyamide.
- 16. The process of claim 2 wherein one of the monomers is an isocyanate.
- 17. The process of claim 18 wherein one of the monomers is an amine.
- 18. The process of claim 17 wherein the isocyanate is aromatic.
- 19. The process of claim 18 wherein the amine is aromatic.
- 20. The process of claim 19 wherein the isocyanate is 2,4-toluene diisocyanate.
- 21. The process of claim 20 wherein the amine is diethyltoluenediamine.
- 22. The process of claim 21 wherein the gas separation membrane is in the form of a hollow fiber.
- 23. The process of claim 22 wherein the gas separation membrane is formed of an aromatic polyamide.
- 24. The process of claim 2 wherein one of the monomers is a glycidyl ether.
- 25. The process of claim 24 wherein one of the monomers is an amine.
- 26. The process of claim 25 wherein the glycidyl ether is aromatic.
- 27. The process of claim 26 wherein the amine is aromatic.
- 28. The process of claim 27 wherein the amine is diethyltoluene diamine.
- 29. The process of claim 28 wherein the amine is diethyltoluene diamine.
- 30. The process of claim 29 wherein the gas separation membrane is in the form of a hollow fiber.
- 31. The process of claim 30 wherein the gas separation membrane is formed of an aromatic polyamide.
- 32. The process of claim 25 wherein the glycidyl ether is aliphatic.
- 33. The process of claim 32 wherein the amine is aromatic.
- 34. The process of claim 33 wherein the glycidyl ether is ethylene glycol diglycidyl ether.
- 35. The process of claim 34 wherein the amine is diethyltoluene diamine.
- 36. The process of claim 35 wherein the gas separation membrane is in the form of a hollow fiber.
- 37. The process of claim 36 wherein the gas separation membrane is formed of an aromatic polyamide.
Parent Case Info
This application is a continuation of application Ser. No. 07/175,499 filed Apr. 13, 1988, now abandoned.
US Referenced Citations (15)
Foreign Referenced Citations (5)
Number |
Date |
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107636 |
Feb 1984 |
EPX |
57-094307 |
Jun 1982 |
JPX |
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0092402 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
175499 |
Apr 1988 |
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