Process for preparing stable anhydrous sodium dithionite
US4126716A · kind A · utility
4Cited by
5References
6Claims
0Family size
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Key dates
| Filing date | Dec 15, 1976 |
| Grant date | Nov 21, 1978 |
| Priority date | — |
| Expiry date | Dec 15, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B17/66
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for preparing stable anhydrous sodium dithionite which comprises reacting formic acid or sodium formate, sodium hydroxide, and sulfurous acid anhydride in hydrous methanol, wherein an aqueous solution of sodium carbonate or sodium hydroxide is added to the slurry after the reaction, and stabilized anhydrous sodium dithionite is separated from the slurry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.