Process for the continuous preparation of aryl carbonates

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

C - Chemistry, Metallurgy

07

C

C07C 69/96 (2006.01) B01J 10/00 (2006.01) B01J 19/24 (2006.01) C07C 68/06 (2006.01) C07C 253/30 (2006.01) C07C 255/55 (2006.01)

Patent

CA 2118664

Process for the continuous preparation of aryl carbonates A b s t r a c t Organic carbonates which contain at least one aromatic ester group can be obtained continuously from carbonates, which contain at least one aliphatic ester group, and a phenolic compound in the presence of a transesterifi- cation catalyst known per se in that the reaction is carried out in a bubble column reactor or in a cascade of at least two bubble column reactors in such a way that the phenolic compound is metered into the first bubble column and the carbonate containing at least one aliphatic ester group is metered into each individual bubble column, but preferably only into the last bubble column. The carbonate containing at least one aromatic ester group is taken off in the liquid state from the last bubble column. Volatile reaction products, for example eliminated alcohol or a dialkyl carbonate are taken off at the upper end of each individual bubble column, preferably at the upper end of the first bubble column.

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