Regular copolyamides as desalination membranes
US3935172A · kind A · utility
8Cited by
5References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 20, 1974 |
| Grant date | Jan 27, 1976 |
| Priority date | — |
| Expiry date | May 20, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31725
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Regular copolyamides of the formula ##EQU1## WHERE X IS 2 TO 10, Y IS 0 TO 8, R is a divalent aliphatic or aromatic radical having 1 to 34 carbon atoms, and n is not less than 10, are prepared by reacting an aliphatic diester with an excess of an aliphatic diamine to form a diamine diamide, and reacting the diamine diamide intermediate with an aliphatic or aromatic diacid chloride. Permselective membranes prepared from the copolyamides find particular utility in desalination of water by reverse osmosis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.