Phenol purification
US4857151A · kind A · utility
7Cited by
10References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 28, 1982 |
| Grant date | Aug 15, 1989 |
| Priority date | — |
| Expiry date | Jun 28, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C37/78
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Crude phenol containing methyl benzofuran and other impurities is distilled in the presence of water to recover a phenol bottoms having a reduced quantity of impurities. The water-phenol overhead is cooled to separate a water phase essentially free of methyl benzofuran, which is recycled to the distillation. The organic phase may then be further distilled, in the presence of water, as previously described, to eventually recover a reduced quantity of phenol in which impurities are concentrated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.