Extractive purification of phenols
US5196565A · kind A · utility
18Cited by
6References
23Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 26, 1992 |
| Grant date | Mar 23, 1993 |
| Priority date | — |
| Expiry date | Jun 26, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C67/58
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a process for the manufacture of granules of low-melting alkyl ester containing hindered hydroxylphenyl groups, which comprises PA0 (a) extracting a melt of crude alkyl ester containing hindered hydroxylphenyl groups with an aqueous alcoholic solution of N,N-dibenzylhydroxylamine (DBHA), PA0 (b) granulating the extracted melt by introducing said melt into an aqueous alcoholic solution maintained under a turbulent state at a temperature below 20.degree. C., and PA0 (c) isolating the resulting granules.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.