Preparation of purified hydroquinone and forming of same
US8071817B2 · kind B2 · utility
3Cited by
4References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2007 |
| Grant date | Dec 6, 2011 |
| Priority date | — |
| Expiry date | Jul 7, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C37/74
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Purified hydroquinone is prepared and formed from raw compounds essentially containing hydroquinone associated with very small quantities of impurities including resorcinol and pyrogallol, and includes a distillation purification step in which the resorcinol and pyrogallol are eliminated, directly followed by a step in which the purified hydroquinone is formed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.