Method for purification of GAA
US10710953B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 2019 |
| Grant date | Jul 14, 2020 |
| Priority date | — |
| Expiry date | Mar 22, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C53/08
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method comprising: contacting methanol with carbon monoxide in the presence of a liquid reaction medium under carbonylation conditions to form a carbonylation product comprising acetic acid; separating the carbonylation product into a liquid fraction and a vapor fraction comprising a majority of the acetic acid in the carbonylation product; removing, from the vapor fraction, water, light ends having a boiling point less than acetic acid, heavy ends having a boiling point greater than acetic acid, or a combination thereof, to yield a crude acetic acid product comprising at least 99.5 wt % acetic acid, less than or equal to 0.2 wt % water, and less than or equal to 2000 ppm oxidizable impurities, based on the total weight of the crude acetic acid product; and contacting the crude acetic acid product with an acidic ion exchange resin to provide a purified acetic acid product comprising less than 100 ppm oxidizable impurities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.