Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters
Patent
1983-05-19
1984-08-21
Siegel, Alan
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid esters
560190, 560204, C07C 6934
Patent
active
044671091
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.
REFERENCES:
patent: 4229589 (1980-10-01), Nishimura et al.
patent: 4229591 (1980-10-01), Nishimura et al.
Fujii Kozo
Matsuda Masaoki
Mizutare Katsuhiko
Nishihira Keigo
Tahara Susumu
Siegel Alan
Ube Industries Ltd.
LandOfFree
Process for continuous preparation of diester of oxalic acid does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for continuous preparation of diester of oxalic acid, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for continuous preparation of diester of oxalic acid will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1937544