Process for removal of impurities from mother liquor in the synthesis of carboxylic acid using pressure filtration
US7470370B2 · kind B2 · utility
5Cited by
33References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 21, 2007 |
| Grant date | Dec 30, 2008 |
| Priority date | — |
| Expiry date | Aug 21, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/584
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process is disclosed that relates to the recovery of a metal catalyst from an oxidizer purge stream produced in the synthesis of carboxylic acid, typically terephthalic. More particularly, the process involves recovery of a metal catalyst from an oxidizer purge stream through the use of a pressure filter, the combining of water with a mother liquor to recover the metal catalyst and then subjecting an aqueous mixture so formed to a single stage extraction with an extraction solvent to produce an extract stream comprising organic impurities and a raffinate stream comprising the metal catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.