Strongly alkaline anion exchange membranes and process for producing the same
US5746917A · kind A · utility
Inventor
Key dates
| Filing date | Feb 15, 1996 |
| Grant date | May 5, 1998 |
| Priority date | — |
| Expiry date | Feb 15, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2371/12
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Chloromethylated polymers are generally used to produce strongly alkaline anion exchange membranes. This requires handling toxic chloromethyl ethers. The object of the invention is thus to create anion exchange membrane which is easy and cheap to produce in a reproducible manner and has good electrochemical properties. It has been discovered that halogenated polyethers, preferably epichlorohydrin polymers with tertiary amines together with an inert polymer may be shaped into such membranes having a high mechanical stability. These membranes may be designed as anion exchange membranes for electrodialytical desalination as acid blocker anion exchange membranes for electrodialysis of acid solutions or as large pore membranes for the transport of large anions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.