Process for the production of purified terephthalic acid
US5583254A · kind A · utility
77Cited by
11References
26Claims
0Family size
Inventors
Key dates
| Filing date | Jan 13, 1995 |
| Grant date | Dec 10, 1996 |
| Priority date | — |
| Expiry date | Jan 13, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/43
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Purified terephthalic acid is prepared by subjecting an aqueous solution of crude terephthalic acid to hydrogenation to reduce impurities, crystallizing this solution to produce a slurry of purified terephthalic acid in an aqueous liquor, and carrying out an integrated separation and washing process. The integrated separation is performed by exchanging the acidic reaction medium with water to produce a water containing cake of terephthalic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.