Production of high purity aromatic carboxylic acid by oxidation in benzoic acid and water solvent
US6562997B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 2001 |
| Grant date | May 13, 2003 |
| Priority date | — |
| Expiry date | Jan 19, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/265
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Processes for the production of aromatic carboxylic acids is disclosed. The aromatic acids are produced by the liquid phase oxidation of a suitable acid precursor in a reaction medium comprising benzoic acid. According to one embodiment, the oxidation is carried out under plug-flow reaction conditions in a plug-flow reactor. The plug-flow conditions can be achieved by the use of a series of continuous stirred tank reactors. In another embodiment, the oxidation is carried out in two continuous stirred tank reactors fluidly connected in series. The preferred oxidation products are terephthalic acid, isophthalic acid, trimellitic acid, 2,6-naphthalene dicarboxylic acid, 1,5-napthalene dicarboxylic acid, 2,7-naphthalene dicarboxylic acid and phthalic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.