Covestro Deutschland Ag

Bayer Materialscience Ag

Henning Kahnis

Johan Vanden Eynde

Kaspar Hallenberger

Ricarda Leiberich

Karl-Heinz Köhler

Gabriel Denecker

Florian Lipski

Korbinian Krämer

Weerachanan Somhom

Roland Parg

Eric Bischof

Andreas Jupke

Annette Conrad

Johannes Eickmans

Andreas Küver

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

A computer-implemented method for monitoring and analyzing energy consumption of a chemical plant in operation. Plant type specific theoretical energy consumption optimum value based on a corresponding modeled plant are determined, parameters contributing to increased energy consumption are identified and grouped. Energy consumption of a plant is periodically graphed starting from the theoretical energy consumption optimum value and getting up as an energy cascade to a current energy consumption, by adding the provided, partly retrieved single energy consumption rates of the respective parameters in groups such that the resulting energy cascade allows to monitor at least a part of the individual parameters and to automatically compare the current energy consumption of the at least one plant with an energy consumption of another plant and/or with a previous energy consumption of the at least one plant with respect to the individual parameters. Furthermore, an appropriate system is provided.

Method and system for monitoring and analyzing energy consumption in operated chemical plants

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Kö'ln, Germany

Henning Kahnis