Methanol carbonylation process with rhodium catalyst and a metallic co-catalyst selected from transition metals, zinc, beryllium, indium, tin, strontium and barium
US9024061B2 · kind B2 · utility
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Key dates
| Filing date | Jun 14, 2010 |
| Grant date | May 5, 2015 |
| Priority date | — |
| Expiry date | Sep 11, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/47
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A carbonylation process for making acetic acid using a metallic co-catalyst composition, effective as a rhodium stabilizer and/or rate promoter, at molar ratios of metal/rhodium of about 0.5 to 40. The process includes reacting methanol with carbon monoxide in the presence of a rhodium-based catalytic metal complex with about 1 to 20 weight percent methyl iodide, less than about 8 weight % water and about 0.5 to about 30 weight percent methyl acetate. The crude acetic acid is flashed and further purified.
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