Method for preparing acetic acid and/or methyl acetate by methyl formate isomerization
US6232490A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 23, 1998 |
| Grant date | May 15, 2001 |
| Priority date | — |
| Expiry date | Sep 23, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C67/293
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method for the preparation of acetic acid and/or methyl acetate by isomerization of methyl formate in a reaction mixture which includes water, a solvent and a catalytic system containing a halogenated promoter and an iridium-based compound. Carbon monoxide is present in the reaction mixture at a partial pressure between 0.1.10.sup.5 Pa and 25.10.sup.5 Pa, methyl formate is maintained below 20% by weight of the reaction mixture and water is maintained in an amount which is at most 5% by weight of the reaction mixture. In a typical system, method formate isomerizes to acetic acid according to the reaction: EQU HCOOCH.sub.3 {character pullout}CH.sub.3 COOH.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.