Process for continuous preparation of diester of oxalic acid

Details Process for continuous preparation of diester of oxalic acid Process for continuous preparation of diester of oxalic acid

C - Chemistry, Metallurgy

07

C

260/486.6

C07C 69/36 (2006.01)

Patent

CA 1160250

FP-1189 -1- Process for continuous preparation of 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, thereby contacting it with a gas containing molecular oxygen and an alcohol, and recycling the resulting gas containing an ester of nitrous acid to the reactor of the first step; a fourth step of distilling out an alcohol containing a diester of carbonic acid formed as a by- product of the first step and obtaining a liquid diester of oxalic acid; and a fifth step of introducing the distillate of the fourth step to a hydrolysis column thereby hydrolyzing the diester of carbonic acid in the gas and recycling the alcohol as an alcohol source for the third step.

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