Process for the production of purified terephthalic acid
US5698734A · kind A · utility
21Cited by
1References
9Claims
0Family size
Assignee
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Key dates
| Filing date | Jun 24, 1996 |
| Grant date | Dec 16, 1997 |
| Priority date | — |
| Expiry date | Jun 24, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/43
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Purified terephthalic acid is prepared by a process of 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 washing process using a centrifuge having washing facilities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.