Removal of chlorate from electrolytic cell anolyte
US4169773A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 1978 |
| Grant date | Oct 2, 1979 |
| Priority date | — |
| Expiry date | Jan 16, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25B1/46
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
In the production of chlorine and caustic by the electrolytic decomposition of brine in a membrane cell, depleted anolyte is often recirculated, with salt resaturation. Chlorate build-up in this recirculating brine results from membrane inefficiencies, and has in the past required purging. It has now been found that a portion of the recirculating brine stream may be reacted with strong acid, such as HCl, to reduce the chlorate, resulting in production of additional chlorine, water, and salt. Such chlorine may be joined with the cell product, while the salt may be utilized in the resaturation of the remainder of the recirculating brine stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.