Process for the recovery of phenol and biphenols
US6680413B2 · kind B2 · utility
0Cited by
1References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 21, 2003 |
| Grant date | Jan 20, 2004 |
| Priority date | — |
| Expiry date | May 21, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/582
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process is described for the recovery of phenol and biphenols from their homogeneous mixtures containing benzene, sulfolane and water, which is based on the use of an alkaline solution and benzene for the separation of biphenols from sulfolane, after removing the benzene, H2O and phenol contained in the reaction effluent.The process allows the recovery of phenol and biphenol by-products dissolved in sulfolane, directly obtaining the purified solvent containing the benzene necessary for the feeding to the reactor for the direct oxidation of benzene, as well as the biphenols dissolved in water and pure phenol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.