Method of producing sodium dithionite by electrochemical means
US5126018A · kind A · utility
1Cited by
17References
7Claims
0Family size
Assignee
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Key dates
| Filing date | Mar 13, 1991 |
| Grant date | Jun 30, 1992 |
| Priority date | — |
| Expiry date | Mar 13, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25B1/14
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method of producing sodium dithionite comprising electrolyzing a catholyte solution of sulfur dioxide in an electrolytic cell at a pH of at least about 3, the electrolytic cell having a carbonaceous cathode, is disclosed. Particularly high current efficiencies can be attained using a high surface area carbon material for the cathode. The use of a stabilizer to inhibit decomposition of the sodium dithionite to form sodium thiosulfate is also disclosed. The stabilizer is added to the catholyte and is selected from the group consisting of phosphoric acid, sodium tripolyphosphate, acid phosphates and mixtures thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.