Preparation of acetic acid
US8076512B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 27, 2009 |
| Grant date | Dec 13, 2011 |
| Priority date | — |
| Expiry date | Mar 18, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/44
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method for reducing aldehydes in an acetic acid production process is disclosed. The acetic acid is produced by reacting methanol and carbon monoxide in the presence of a carbonylation catalyst. The method comprises reacting an aldehyde-containing stream with an alcohol to form an acetal-containing stream. An acetal-enriched stream is separated from the acetal-containing stream and then hydrolyzed to form a hydrolysis mixture comprising the alcohol and the aldehydes. The alcohol is isolated from the hydrolysis mixture and used to react with the aldehyde-containing stream to form the acetal-containing stream. The invention reduces aldehydes in the acetic acid produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.