Process for preparing acetic acid, methyl acetate, acetic anhydride or mixtures thereof
US5286900A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 1992 |
| Grant date | Feb 15, 1994 |
| Priority date | — |
| Expiry date | Sep 4, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/52
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
From a synthesis gas mainly consisting of hydrogen and carbon oxides an acetic acid product consisting of acetic acid, acetic anhydride and/or methyl acetate is prepared by reactions known per se in a technically simple reaction sequence and a high conversion degree when the reactions are combined such that in a first step at a pressure of 5-200 bar and a temperature of 150.degree.-400.degree. C. the synthesis gas is converted in the gas phase in a first reactor to methanol, of which at least a substantial proportion is converted to dimethyl ether in the same reactor in the presence of one or more catalysts which together catalyze the reactions EQU CO+2H.sub.2 .revreaction.CH.sub.3 OH (1) EQU 2 CH.sub.3 OH.revreaction.CH.sub.3 OCH.sub.3 +H.sub.2 O (2) and EQU CO+H.sub.2 O.revreaction.CO.sub.2 +H.sub.2 (3) and then passing the entire effluent from the first reactor to a second reactor in which methanol and dimethyl ether at a pressure of 1-800 bar and a temperature of 100.degree.-500.degree. C. are carbonylated to the desired product in the presence of one or more catalysts which together catalyze the reactions EQU CH.sub.3 OH+CO.fwdarw.CH.sub.3 COOH (4) EQU CH.sub.3 OCH.sub.3 +CO.f…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.