Preparation of dimethyl terephthalate via the air oxidation of p-tolualdehyde
US6160159A · kind A · utility
3Cited by
3References
46Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 30, 1999 |
| Grant date | Dec 12, 2000 |
| Priority date | — |
| Expiry date | Jul 30, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C67/39
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention is directed to a process for the production of terephthalic acid and esters thereof from p-tolualdehyde or mixtures of p-tolualdehyde and p-xylene. The process of the invention can be carried out at lower temperatures and faster throughput than conventional processes using p-xylene. The use of p-tolualdehyde facilitates safety considerations by eliminating the induction period and high oxiding fluid concentrations encountered in typical oxidation reactions which use only p-xylene as the terephthalic acid or ester precursor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.