Removal of thiosulfate from hydrosulfite solutions
US5112452A · kind A · utility
0Cited by
6References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1991 |
| Grant date | May 12, 1992 |
| Priority date | — |
| Expiry date | Jul 22, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B17/66
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for treating an alkali metal hydrosulfite solution containing thiosulfate ions as an impurity which comprises reducing cathodically the alkali metal hydrosulfite solution to convert thiosulfate ions to sulfide ions, the alkali metal hydrosulfite solution having a residual alkalinity of from about 0.1 to about 20 grams per liter of hydroxide ion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.