Continuous process for the manufacture of 3,5,5-trimethylcyclohexa-3-en-1-one (B-isophorone)
US6274771A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 2000 |
| Grant date | Aug 14, 2001 |
| Priority date | — |
| Expiry date | Jun 22, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C45/82
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
For the continuous manufacture of .beta.-isophorone by isomerization under homogeneous catalysis of .alpha.-isophorone, the steps of introducing the .alpha.-isophorone and a solution of an alkaline hydroxide into a reaction region, bringing the reaction mixture to reflux at a temperature at least equal to 150.degree. C. under a equal P1 of less than or equal to atmospheric pressure, continuously and simultaneously removing from the reaction mixture: .beta.-isophorone vapor, by distillation under a pressure P2 less than P1 and at a temperature at most equal to 150.degree. C., and heavy products, at a rate, so that their content by weight is at most equal to 7% in the reaction mixture, and continuous returning the distillation to the reaction region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.