Process for the purification of a crude carboxylic acid slurry
US7132566B2 · kind B2 · utility
45Cited by
48References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 22, 2003 |
| Grant date | Nov 7, 2006 |
| Priority date | — |
| Expiry date | Sep 22, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/487
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Disclosed is a process to produce a purified carboxylic acid product. The process comprises removing impurities from a crude carboxylic acid slurry in a solid-liquid displacement zone to form a slurry product. The slurry product if further treated in a staged oxidation zone and a crystallization zone to from a crystallized product. The crystallized product is further cooled in a cooling zone and subsequently filtered and dried in a filtration and drying zone. The process produces purified carboxylic acid product having good color and low impurity levels without the use of purification steps like hydrogenation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.