Process for the purification of aromatic carboxylic acids
US6833472B2 · kind B2 · utility
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12Claims
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Key dates
| Filing date | Jan 9, 2003 |
| Grant date | Dec 21, 2004 |
| Priority date | — |
| Expiry date | Mar 7, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/487
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A novel process for the purification of crude aromatic carboxylic acids, such as, for example, terephthalic acid, orthophthalic acid, trimesic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid and pyromellitic acid, which are obtained by oxidising the corresponding aromatic precursors is described; the process is based on the subsequent oxidation in heterogeneous phase of the crude product in aqueous solution.
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