Preparation of dimethyl terephthalate via the air oxidation of p

Details Preparation of dimethyl terephthalate via the air oxidation of p Preparation of dimethyl terephthalate via the air oxidation of p

1999-07-30

2000-12-12

Richter, Johann

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

562407, 562409, C07C 6700, C07C 5116

Patent

active

061601594

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.

REFERENCES:
patent: 4353810 (1982-10-01), Wendle, Jr.
patent: 4820862 (1989-04-01), Hoffmann et al.
patent: 5679847 (1997-10-01), Ohkoshi et al.

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