Process for the continuous preparation of dialkyl carbonates

Details Process for the continuous preparation of dialkyl carbonates Process for the continuous preparation of dialkyl carbonates

C - Chemistry, Metallurgy

07

C

C07C 69/96 (2006.01) C07C 68/06 (2006.01)

Patent

CA 2077196

Dialkyl carbonates can be prepared in a continuous manner by transesterification of ethylene carbonate or propylene carbonate with alcohols in the presence of a catalyst in a column equipped with packing or baffles, by passing the reactants in countercurrent such that the ethylene carbonate or propylene carbonate are metered into the upper part of the column and the alcohol is metered into the lower part of the column and the catalyst is arranged as a fixed bed in the column or is also metered into the upper part of the column in solution or suspension, the dialkyl carbonate formed, if appropriate as a mixture with alcohol, being removed at the top of the column and the ethylene glycol or propylene glycol formed from the ethylene carbonate or propylene carbonate being removed at the toot of the column, if appropriate together with the catalyst.

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