Process for the production of bisphenols
US5777180A · kind A · utility
16Cited by
0References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 18, 1996 |
| Grant date | Jul 7, 1998 |
| Priority date | — |
| Expiry date | Dec 18, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C37/20
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
An improved process for the production of bisphenols is presented in which ketones and phenols are reacted in the presence of an acidic cationic exchange resin catalyst and a mercaptan cocatalyst. Prior to the reaction, alkyl alcohol is removed from the ketone stream. Cocatalyst is withdrawn from the reactor so that cocatalyst derivatives such as disulphide ions can be removed from the presence of the catalyst thereby reducing the possibility of catalyst poisoning.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.