Purification of hydroxyphenyl alkanes
US5202505A · kind A · utility
4Cited by
1References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 24, 1992 |
| Grant date | Apr 13, 1993 |
| Priority date | — |
| Expiry date | Mar 24, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C37/72
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Crude hydroxyphenylalkane, e.g., 1,1,1-tris(4'-hydroxyphenyl)ethane, is purified, to reduce color and prevent caustic solution turbidity, (a) by contacting the hydroxyphenylalkane in alcoholic solution with an alkali metal dithionite, preferably in the presence of an alkalinity agent such as an alkali metal borohydride, more preferably by introducing the dithionite into the alcoholic solution as an alkaline aqueous solution, (b) precipitating the hydroxyphenylalkane from the alcoholic solution, and optionally (c) rinsing the hydroxyphenylalkane with an alkaline aqueous solution of the dithionite.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.