Purification of terephthalic acid
US4626598A · kind A · utility
23Cited by
6References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1985 |
| Grant date | Dec 2, 1986 |
| Priority date | — |
| Expiry date | Jun 17, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/487
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
An improved method for producing purified terephthalic acid by catalytic hydrogenation is disclosed. Control of the reduction of colored compounds during the production of purified terephthalic acid is effected by modulating solution hydrogen concentration during hydrogenation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.