Covestro Deutschland Ag

Korbinian Krämer

Pieter Ooms

Johan Vanden Eynde

Georg Ronge

Kaspar Hallenberger

Ricarda Leiberich

Karl-Heinz Köhler

Gabriel Denecker

Florian Lipski

Friedhelm Risse

Henning Kahnis

Ralph Schellen

Weerachanan Somhom

Carsten Buchaly

Karl-Heinz KÖHLER

The invention concerns a method for producing diaryl carbonates from monophenols and phosgene or chloroformic acid aryl esters in the presence of at least one optionally substituted pyridine or the hydrochloride salt thereof as catalyst, and the recovery and reinjection thereof back into the method. The method is carried out at least partially in a liquid phase without the use of an additional solvent, the catalyst being separated by means of distillation and recovered.

Method for producing diaryl carbonates

The invention concerns a method for producing diaryl carbonates from monophenols and phosgene or chloroformic acid aryl esters in the presence of an optionally substituted pyridine or the hydrochloride salt thereof as catalyst, and the recovery and reinjection thereof back into the method. The method is carried out at least partially in a liquid phase without the use of an additional solvent, the catalyst being separated by means of crystallization and recovered.

The present application relates to a method for the continuous production of diaryl carbonate from phosgene and of at least one monohydroxy compound (monophenol) in the presence of catalysts, and to the use thereof for the production of polycarbonates.

Method for producing diaryl carbonate

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Kö'ln, Germany

Korbinian Krämer