Polycarboxylic acid production system employing cooled mother liquor from oxidative digestion as feed to impurity purge system
US7326808B2 · kind B2 · utility
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50Claims
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Key dates
| Filing date | Mar 1, 2006 |
| Grant date | Feb 5, 2008 |
| Priority date | — |
| Expiry date | Jul 1, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/42
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Disclosed is an optimized system for more efficiently and economically producing terephthalic acid. A solvent purification system is employed to remove of at least one aromatic impurity present in a solvent purification feed. At least about 20 weight percent of the solvent purification feed originates from a cooled, post-digestion, TPA-containing slurry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.