Process for preparing dialkyl oxalates

Details Process for preparing dialkyl oxalates Process for preparing dialkyl oxalates

C - Chemistry, Metallurgy

07

C

260/486.7

C07C 69/36 (2006.01) B01J 31/04 (2006.01) B01J 31/18 (2006.01) B01J 31/24 (2006.01)

Patent

CA 1067093

ABSTRACT OF THE DISCLOSURE: A process for preparing dialkyl oxalates by reacting an alkanol having from 1 to 6 carbon atoms with carbon monoxide and oxygen under pressure. According to the invention, the reaction is carried out in the presence of (a) a catalyst consisting of a mixture of a salt of a platinum group metal and a salt of copper or iron and (b) an accelerator composed of one or more compounds selected from the group consisting of carbonates, hydrogen carbonates, nitrates, sulfates, hydroxides and carboxylates of an alkali metal and of an alkaline earth metal, pyridine, quinoline, glycine, alanine, urea, thiourea, formamide, acetamide, acetyl- acetone, ethyl acetoacetate, dimethylglyoxime, a tertiary amine, and a substituted or unsubstituted triphenyl phosphine are both used. The process of the invention enables one to produce dialkyl oxalates in a high yield and a high selectivity, even in the presence of water.

223959

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