Process for the purification of 2,6-diisopropyl phenol
US5175376A · kind A · utility
5Cited by
3References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1992 |
| Grant date | Dec 29, 1992 |
| Priority date | — |
| Expiry date | Apr 30, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C37/84
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The object of the invention is a new method for the purification of 2,6-diisopropyl phenol (propofol). The invention is characterized in that the raw product obtained from the alkylation of propene with phenol is crystallized at a temperature where propofol crystallizes but the isomers and other phenol derivatives formed in the reaction are still in liquid form, i.e. at a temperature of -25.degree. to +18.degree. C. especially at -20.degree. to -10.degree. C., without a solvent or using a suitable solvent, such as hexane or petrol ether.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.