Method for clarifying discolored trimethylhydroquinone solutions
US4147625A · kind A · utility
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6Claims
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Key dates
| Filing date | Apr 26, 1978 |
| Grant date | Apr 3, 1979 |
| Priority date | — |
| Expiry date | Apr 26, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C37/86
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Trimethylhydroquinone (TMHQ) which is discolored in organic solution because of air oxidation can be made nearly colorless by addition of small amounts of alkali metal borohydride to the discolored solution. Products remaining in the TMHQ solution after discoloration removal can be extracted by water wash. This technique represents a very simple and efficient method for removing discoloration which has proved troublesome in the prior art.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.