Method for rejuvenating chlor-alkali cells
US4204921A · kind A · utility
5Cited by
2References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 19, 1979 |
| Grant date | May 27, 1980 |
| Priority date | — |
| Expiry date | Mar 19, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25B15/00
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Deposits of alkali metal ions such as calcium and magnesium on chlor-alkali cathodes and diaphragms are removed by feeding an acid such as hydrochloric acid into the cathode feed in an amount sufficient to reduce the pH below 8 for a time sufficient to remove these deposits and restore the cell to normal operation. The use of this invention allows one to use relatively high hardness water as the cathode feed solution during normal operation of a membrane chlor-alkali cell.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.