Process for the production of terephalic acid
US5679846A · kind A · utility
55Cited by
8References
15Claims
0Family size
Assignee
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Key dates
| Filing date | Jul 17, 1996 |
| Grant date | Oct 21, 1997 |
| Priority date | — |
| Expiry date | Jul 17, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/52
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A terephthalic acid slurry in acetic acid is produced by oxidizing p-xylene in acetic acid, removing water by evaporation of a stream of water and acetic acid, and returning acetic acid to the oxidation step. The terephthalic acid is separated from the reaction medium in a first zone to leave a deposit on a band, the deposit is washed with a first aqueous medium in a second zone, removed from the band in a third zone, and admixed with a second aqueous medium. Reaction medium is passed from the first zone to the oxidation step and terephthalic acid is recovered, preferably after further purification.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.