Heat-treated fluorocarbon sulfonamide cation exchange membrane and process therefor
US4168216A · kind A · utility
9Cited by
2References
29Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Sep 27, 1978 |
| Grant date | Sep 18, 1979 |
| Priority date | — |
| Expiry date | Sep 27, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2327/18
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An ion exchange membrane of a fluorinated polymer which contains sulfonyl groups, wherein the sulfonyl groups on one surface of the membrane are in the form of N-monosubstituted sulfonamide groups formed from a di- or polyamine, is treated by heating at a temperature of 100.degree. to 160.degree. C. for a time of at least 15 minutes. The resulting membrane is useful as the membrane in a chloralkali electrolysis cell, and permits operation of such cells at high current efficiency over extended periods of time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.