Purification of 4,4-dihydroxybiphenyl
US4414422A · kind A · utility
7Cited by
7References
8Claims
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Assignee
Inventors
Key dates
| Filing date | May 10, 1982 |
| Grant date | Nov 8, 1983 |
| Priority date | — |
| Expiry date | May 10, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C37/70
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
4,4'-Dihydroxybiphenyl is purified to remove sulfur-containing impurities, color bodies and/or phenyl-substituted phenol compounds by heating in the presence of a mixture of water and a water-miscible organic compound selected from acetone and C.sub.1-6 alkanols or diols for a time sufficient to remove substantial quantities of the sulfur-containing impurity, color bodies and/or phenyl-substituted phenol compound and thereafter recovering the purified 4,4'-dihydroxybiphenyl.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.