Process for the production and purification of aromatic acids
US6565754B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Nov 15, 2001 |
| Grant date | May 20, 2003 |
| Priority date | — |
| Expiry date | Nov 15, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/912
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A description is given here of a novel process for the production of monocarboxylic and polycarboxylic aromatic acids by the catalytic oxidation in homogeneous phase of aromatic compounds carrying at least one oxidizable substituent group attached directly to the carbon atom of the corresponding aromatic nucleus. The process comprises a purification step in which the crude product resulting from the oxidation stage is supplied to a filling column containing a bed of material having a high adsorbent power with respect to hafnium and/or zirconium polyoxides, operating at a temperature of from 200 to 300° C. and at a pressure of from 30 to 90 barg.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.