Process for preparing diaryl carbonates

Details Process for preparing diaryl carbonates Process for preparing diaryl carbonates

C - Chemistry, Metallurgy

07

C

C07C 69/96 (2006.01) C07C 68/00 (2006.01)

Patent

CA 2135656

Diaryl carbonates can be prepared by reacting aromatic hydroxy compounds with CO and O2 at elevated temperature over a noble metal catalyst in the presence of a base, a quaternary salt, a cocatalyst and a dessicant. According to the invention, the noble metal catalyst is activated with CO in the presence of the quaternary salt and optionally in the presence of the cocatalyst. In a par- ticular process variant, the base used is a preformed alkali metal phenoxide.

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