Acetic acid production by way of carbonylation with enhanced reaction and flashing
US8168822B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 7, 2009 |
| Grant date | May 1, 2012 |
| Priority date | — |
| Expiry date | Aug 25, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/44
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method of making acetic acid includes: (a) catalytically reacting methanol or a reactive derivative thereof with carbon monoxide in the presence of a homogeneous Group VIII metal catalyst and a methyl iodide promoter in a reactor vessel in a liquid reaction mixture including acetic acid, water, methyl acetate, methyl iodide and homogeneous catalyst, the reactor vessel being operated at a reactor pressure; (b) withdrawing reaction mixture from the reaction vessel and feeding the withdrawn reaction mixture along with additional carbon monoxide to a pre-flasher/post reactor vessel operated at a pressure below the reactor vessel pressure; (c) venting light ends in the pre-flasher vessel and concurrently consuming methyl acetate in the pre-flasher/post reactor vessel. Reaction conditions, residence time and composition are controlled in the pre-flasher/post reactor vessel such that a pre-flash mixture is enriched in acetic acid and diminished in methyl iodide and methyl acetate in the pre-flasher/post reactor vessel. From the pre-flasher/post reaction vessel the acetic acid enriched mixture is (d) withdrawn and fed to a flash vessel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.