Process for the production of thiocarbohydrazide
US4946995A · kind A · utility
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4References
9Claims
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Key dates
| Filing date | Mar 17, 1989 |
| Grant date | Aug 7, 1990 |
| Priority date | — |
| Expiry date | Mar 17, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C337/06
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
TCH is produced by a process which does not require expensive measures to remove hydrazine. In this process, hydrazinium dithiocarbazinate is reacted with an amine other than hydrazine or a strong base, optionally in the presence of water. It is preferred that a sulfur suppressing compound also be included in the reaction mixture. The precipitated TCH is removed from the reaction mixture to leave a mother liquor. Hydrazinium-dithiocarbazinate may then be added to the mother liquor. TCH precipitates and may be readily recovered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.