Process for preparing oxalic acid diesters

Details Process for preparing oxalic acid diesters Process for preparing oxalic acid diesters

C - Chemistry, Metallurgy

07

C

260/486.6

C07C 69/36 (2006.01)

Patent

CA 1187094

Abstract of the Disclosure This invention relates to an improved process for preparing a diester of oxalic acid by the vapor (or gaseous) phase catalytic reaction of carbon monoxide with an ester of nitrous acid in the presence of a catalyst composed of a platimun-group metal or a salt thereof supported on a solid carrier which is alumina having a specific surface area of not more than 90 m2/g. According to this process, the diester of oxalic acid can be produced at a high space time yield (based on the platinum-group metal) and high selectivity with reduced formation of a carbonic acid diester and carbon dioxide as by-products. A further advantage of this process is that the amount of the platinum-group metal used can be decreased and it can be easily recovered.

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