Process for continuously preparing a diester of oxalic acid

Details Process for continuously preparing a diester of oxalic acid Process for continuously preparing a diester of oxalic acid

1983-05-19

1984-07-24

Siegel, Alan

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

Organic compounds

Carboxylic acid esters

560190, 560204, C07C 6934

Patent

active

044619090

ABSTRACT:
There is provided a process for the continuous preparation of a diester of oxalic acid which comprises a first step of reacting carbon monoxide with an ester of nitrous acid in the gaseous phase; a second step of condensing the gaseous reaction mixture to separate a non-condensed gas from a condensed liquid containing the diester of oxalic acid; a third step of introducing the non-condensed gas of the second step to a regeneration column and thereby contacting it with a gas containing molecular oxygen and an alcohol to regenerate nitrogen monoxide in the non-condensed gas into an ester of nitrous acid so as to bring the concentration of nitrogen monoxide in the gas at the outlet of the column to a level of from 2 to 7% by volume; and a fourth step of recycling the gas of the third step containing the ester of nitrous acid and from 2 to 7% by volume of nitrogen monoxide to the reactor of the first step.

REFERENCES:
patent: 4229589 (1980-10-01), Nishimura et al.
patent: 4229591 (1980-10-01), Nishimura et al.

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