Process for making aromatic aldehydes
US6303827A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 1999 |
| Grant date | Oct 16, 2001 |
| Priority date | — |
| Expiry date | Sep 10, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C63/307
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Alkyl aromatic compounds are converted to alkyl aromatic aldehydes by a carbonylation reaction. The carbonylation catalyst can be a high boiling point carbonylation catalyst which allows for the separation of the aldehyde product by selective volatilization. Alternatively, the carbonylation catalyst can be selected from perfluoroalkyl sulfonic acids having 2 to 18 carbon atoms, perfluoroether sulfonic acids having 2 to 18 carbon atoms, BF.sub.3 (ROH).sub.x wherein R represents CH.sub.3 or H and X is a number within the range of from 0.2 to 2, GaBr.sub.3, GaCl.sub.3, TaF.sub.5, NbF.sub.5, and NbBr.sub.5, with the proviso that when the catalyst is TaF.sub.5, NbF.sub.5, or NbBr.sub.5, then the reaction takes place in the absence of added HF. Preferably, all of the carbonylation reactions take place in the absence of added HF. The alkyl aromatic aldehydes can be oxidized to form an aromatic acid. A mixed xylene feed stock can be converted to a mixture of dimethylbenzaldehydes and then oxidized to form trimellitic acid without the need to separate the xylene or dimethylbenzaldehyde isomers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.