Process for the hydrolysis of dialkyl carbonates

Details Process for the hydrolysis of dialkyl carbonates Process for the hydrolysis of dialkyl carbonates

C - Chemistry, Metallurgy

07

C

260/486.7

C07C 67/36 (2006.01) C07C 29/09 (2006.01) C07C 69/36 (2006.01)

Patent

CA 1285288

ABSTRACT OF THE DISCLOSURE A process is provided for the utilization of dialkyl carbonates formed as by-products in a continuous process for the synthesis of oxalic acid esters from nitrous acid esters and carbon monoxide and wherein the esters are subsequently used as intermediates in the production of commercially useful products, such as ethylene glycol. The process comprises contacting a mixture containing the by-product comprised of a dialkyl carbonate with an aqueous solution of a metal carbonate under hydrolyzing conditions whereby the dialkyl carbonate is converted to the corresponding alkanol and the metal carbonate is converted to metal bicarbonate. Upon distillation of the alkanol from the mixture the bicarbonate is converted back to the metal carbonate which can then be recycled from the bottoms to the hydrolyzing zone for use in further hydrolysis of by-product. The alkanol is recycled for use in the continuous process.

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