Process for the production of oxalic acid diesters

Details Process for the production of oxalic acid diesters Process for the production of oxalic acid diesters

1986-04-09

1987-12-15

Lone, Werren B.

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

Organic compounds

Carboxylic acid esters

502181, 502185, 502230, 560193, C07C 6736

Patent

active

047134836

ABSTRACT:
A process for the production of diesters of oxalic acid by oxidative carbonylation of alcohols with carbon monoxide and oxygen as oxidizer at pressures of 1 to 700 atmospheres and in a temperature range between 20.degree. and 250.degree. C. in a reaction phase containing the alcohol and, as catalyst, palladium and at least one metal halide in catalytically effective amounts, whereby a catalyst system is used which consists of palladium, at least one metal halide, and an activated carbon which has been pretreated before use by heating to 200.degree.-1,500.degree. C. in a gas atmosphere G, differing from air.
The gas atmosphere G, differing from air, consists, preferably, of at least one of the gases (a) nitrogen; (b) nitrogen compounds, except those with nitrogen-oxygen bonds; or (c) carbon monoxide; and may optionally contain an accompanying gas.

REFERENCES:
patent: 3393136 (1968-07-01), Fenton et al.
patent: 3994960 (1976-11-01), Yamazaki et al.

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