Method for purifying terephthalic acid recycle streams
US4833269A · kind A · utility
49Cited by
1References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 5, 1988 |
| Grant date | May 23, 1989 |
| Priority date | — |
| Expiry date | Aug 5, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/487
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process is disclosed for purifying a crude terephthalic acid mother liquor stream comprising oxidation catalysts, terephthalic acid, color bodies and impurities by hydrogenation in the presence of a rhodium-on-carbon catalyst wherein color bodies and impurities are hydrogenated to saturated compounds for subsequent oxidation to carbon oxides. The terephthalic acid in said stream is thereupon recovered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.