Process for the manufacture of acetic acid
US8637699B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 2011 |
| Grant date | Jan 28, 2014 |
| Priority date | — |
| Expiry date | Jul 26, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/487
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The disclosure relates to a process in which methanol is carbonylated in a reaction zone in the presence of a catalyst to obtain a reaction mixture (A) comprising acetic acid, hydrogen iodide, methyl iodide, water and the catalyst. At least a part of the reaction mixture (A) is separated in a flash zone to obtain a vapor stream (BV) which comprises acetic acid, hydrogen iodide, methyl iodide and water. The vapor stream (BV) is withdrawn from the flash zone, and the withdrawn vapor stream is then reacted with at least one alkylimidazole to obtain a composition (C) from which acetic acid is separated. By reacting the vapor stream (BV) with the alkylimidazole at least parts of the hydrogen iodide and methyl iodide contained in (BV) are bound in form of iodide salts which significantly facilitates the separation of crude acetic acid from the vapor stream (BV) and the further purification of the crude acetic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.