Process for recovering 4,4' dihydroxydiphenyl sulfone from an isomer mixture
US5001270A · kind A · utility
2Cited by
11References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 18, 1989 |
| Grant date | Mar 19, 1991 |
| Priority date | — |
| Expiry date | Jan 18, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C317/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for recovering 4,4' bisphenol sulfone from an isomer mixture comprising the 4,4' and 2,4' isomers of bisphenol sulfone, which process comprises dissolving the isomer misture in a basic aqueous solution and adding a non-neutralizing amount of acid to selectively precipitate crystals of 4,4' bisphenol sulfone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.