Covestro Deutschland Ag

Weerachanan Somhom

Johan Vanden Eynde

Kaspar Hallenberger

Ricarda Leiberich

Karl-Heinz Köhler

Gabriel Denecker

Florian Lipski

Henning Kahnis

Korbinian Krämer

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.

Growing community of inventors

Uttaradit, Thailand

Weerachanan Somhom