Process for preparing carboxylic acids
US5218143A · kind A · utility
4Cited by
2References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 27, 1991 |
| Grant date | Jun 8, 1993 |
| Priority date | — |
| Expiry date | Sep 27, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
An improved liquid-phase process for preparing carboxylic acids having (n+1) carbon atoms by rhodium catalyzed carbonylation of an alcohol having n carbon atoms is provided. The process is particularily suitable for preparing acetic acid from methanol in commercial carbonylation reactors operating at steady-state with a low standing quantity of water (e.g. 0.5 to 5% by weight). The improvement lies in carrying out the carbonylation in the presence of an iodide stabilizer (e.g. lithium iodide) and a Group VI B metal costabiliser. The process can optionally be carried out in the presence of hydrogen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.