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

C - Chemistry, Metallurgy

07

C

260/486.6

C07C 69/36 (2006.01)

Patent

CA 1160249

FP-1188 Process for continuously preparing a diester of oxalic acid 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.

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