Method for producing bisphenol-A
US6943273B2 · kind B2 · utility
2Cited by
7References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 2, 2002 |
| Grant date | Sep 13, 2005 |
| Priority date | — |
| Expiry date | Aug 2, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2531/08
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Provided is a process for producing a bisphenol A by continuously feeding phenol and acetone into a reactor unit having at least two reaction zones connected in series. In the process, an acidic cation-exchange resin partially neutralized with a sulfur-containing nitrogen compound in from 15 to 50% of the acid site thereof is used as the catalyst, and acetone having a methanol concentration of at most 3,000 ppm is separately fed into at least two reaction zones in the reactor unit. The life of the acidic cation-exchange resin catalyst used in the process is prolonged.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.