Polycarboxylic acid production system employing enhanced evaporative concentration downstream of oxidative digestion
US7772424B2 · kind B2 · utility
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40Claims
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Key dates
| Filing date | Mar 1, 2006 |
| Grant date | Aug 10, 2010 |
| Priority date | — |
| Expiry date | Apr 22, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/44
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Disclosed is an optimized system for more efficiently and economically producing terephthalic acid. The system employs an evaporative removal step downstream of oxidative digestion. The evaporative removal step removes a portion of the liquid phase and promotes precipitation of certain aromatic impurities. By promoting precipitation of certain aromatic impurities, the amount of the precipitated impurities in the recycled solvent is advantageously reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.