Process for the preparation of dimethyl terephthalate

Details Process for the preparation of dimethyl terephthalate Process for the preparation of dimethyl terephthalate

1980-09-18

1982-08-24

Trousof, Natalie

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

Organic compounds

Carboxylic acid esters

252431C, 252463, 252471, 560 77, 562412, 562414, C07C 6708

Patent

active

043462308

ABSTRACT:
A process for the preparation of dimethyl terephthalate by the oxidation of p-xylene/methyl p-toluate mixtures, preferably with air, esterification of the resulting acid products, and recycling of the methyl p-toluate to the oxidation stage, employs an oxidation catalyst consisting of a combination of cobalt and manganese compounds. The concentration of manganese (Mn.sup.++) ranges between about 0.0001% and about 0.005% by weight.

REFERENCES:
patent: 2245528 (1941-06-01), Loder
patent: 2894978 (1959-07-01), Katzchmann
patent: 3253017 (1966-05-01), Katzchmann
patent: 3845100 (1974-10-01), Kusak

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