Bayer Aktiengesellschaft

Bayer Materialscience Ag

Bayer Intellectual Property Gmbh

Frx Polymers, Inc.

Covestro Deutschland Ag

Bsyer Aktiengesellschaft

Covestro Intellectual Property Gmbh & Co. Kg

Pieter Ooms

Hans-Josef Buysch

Pramod Gupta

J&ouml;rg Hofmann

Johann Rechner

Johan Vanden Eynde

Walter Sch&auml;fer

Hans-Joachim Santel

Georg Ronge

Andre Düx

Andreas Bulan

Franz Kunisch

Bernd-Ulrich Schenke

Robert R Schmidt

Harry Strang

Jörg Hofmann

Kaspar Hallenberger

Reiner Fischer

Albrecht Marhold

Otto Schallner

Rainer Weber

Uta Jensen-Korte

Friedhelm Risse

Norbert Schon

Steffen Kuhling

Christian Laue

Ursula Jansen

Walter Schäfer

Wim Wuytack

Gerd Hanssler

Helmut-Werner Heuer

Werner Daum

Gottfried Zaby

Birgit Krauskopf

Marc Buts

Thomas Pancur

Erhard-Gunther Hoffmann

Arthur Susanto

Alexander Klausener

Benedikt Becker

Bernd Baasner

Christoph Gürtler

Thomas Ernst Müller

Manfred Dietrich

Michael Schelhaas

Heinrich Schrage

Carl Casser

Michael Prein

Dieter Freitag

Lawino Kagumba

Ulrich Notheis

Gunter Klug

Henry Giera

Pin Go

Michael Traving

Stephan Konrad

Stephan Ehlers

John Lohrenz

Robert-Joseph Kumpf

Christian Rasp

Wolfgang Jakob

Ralf Pakull

Ricarda Leiberich

Hans-Joachim Graf

Karl-Heinz Köhler

Jan Heijl

Matthias Böhm

Ulrike Wachendorff-Neumann

Christoph Erdelen

Bernhard Homeyer

Markus Dollinger

Wolfgang Behrenz

Andreas Turberg

Manfred Jautelat

Norbert Mencke

Walter Leitner

Hans-Georg Heine

Dietmar Bielefeldt

Bernd Alig

Aurel Wolf

Harald Pielartzik

Walter Schafer

Bernd Klinksiek

Gerhard Fennhoff

Burkhard Köhler

Heinrich Konigshofen

Rafael Warsitz

Christian Steinlein

Martin Döbler

Ursula Pentling

Jurgen Dahmer

Joachim Haider

Erik Sluyts

Michael Schneider

Achim Bertsch

Eric Bischof

Gerhard Arnold Braun

Michaela Meiers

Ralph Schellen

J Org Stetter

The present invention relates to a continuous process for producing lower dialkyl carbonates as a main product and alkylene glycol as a by-product by transesterification of a cyclic alkylene carbonate (e.g. ethylene or propylene carbonate) with lower alkyl alcohols in the presence of a catalyst and also the necessary purification of the dialkyl carbonate in a subsequent process step. For optimization of the economic efficiency and energy efficiency of the process, additional devices are used for intermediate heating of the internal liquid streams within the apparatus.

Process for producing dialkyl carbonates

The present invention relates to a process for the continuous preparation of diaryl carbonates from phosgene and at least one monohydroxy compound (monophenol) in the presence of catalysts, and also the use thereof for preparing polycarbonates. The hydrogen chloride formed in the reaction is converted by thermal oxidation into chlorine, with the chlorine being recirculated to the preparation of phosgene. In particular, the process comprises utilization of the hydrogen chloride formed for the process for preparing diphenyl carbonate (DPC process).

Process for preparing diaryl carbonates and polycarbonates

The present invention relates to a process for the continuous preparation of diaryl carbonates from phosgene and at least one monohydroxy compound (monophenol) in the presence of catalysts, and also the use thereof for preparing polycarbonates. The hydrogen chloride formed in the reaction is converted by electrochemical oxidation into chlorine, with the chlorine being recirculated to the preparation of phosgene. In particular, the process comprises utilization of the hydrogen chloride formed for the process for preparing diphenyl carbonate (DPC process).

The invention provides a process for preparing diaryl carbonates from dialkyl carbonates and aromatic hydroxyl compounds using at least two reaction columns, a process section for recovering the dialkyl carbonate used in the reaction and for removing the alcohol of reaction, one or more process steps for removing the by-products obtained in the process which have a boiling point between that of the dialkyl carbonate and that of the alkyl aryl carbonate formed during the preparation of the diaryl carbonate, and a process step for further purification of the diaryl carbonate obtained from the reaction columns.

Process for preparing diaryl carbonates from dialkyl carbonates

The invention relates to bimetallic complexes in which the ligand contains a salophen unit which complexes copper, manganese or cobalt and a phenanthroline unit which complexes palladium and the two systems are linked by a continuous conjugated system. The invention further relates to the use of these bimetallic complexes as catalysts for the oxidative carbonylation of aromatic hydroxy compounds to form diaryl carbonates, a process for preparing diaryl carbonates using the bimetallic complex as catalyst and also diaryl carbonates prepared by oxidative carbonylation of aromatic hydroxy compounds using the bimetallic complexes of the invention as catalysts.

Bimetallic complexes and the use thereof in producing diaryl carbonate

The invention relates to a process for preparing diaryl carbonates and/or alkyl aryl carbonates from dialkyl carbonates and aromatic hydroxy compounds using a reactive dividing wall column.

Process for preparing diaryl carbonates or alkyl aryl carbonates from dialkyl carbonates

A process for preparing diaryl carbonate and utilizing at least part of the process wastewater by increasing the concentration of the wastewater phases containing sodium chloride for the electrolysis by means of osmotic membrane distillation with simultaneous dilution of the sodium hydroxide solution obtained from the electrolysis for the diaryl carbonate production process (diphenyl carbonate process) is described.

Process for preparing diaryl carbonate

Disclosed are random copoly(phosphonate carbonate)s with the high molecular weight and narrow molecular weight distribution exhibiting a superior combination of properties compared to prior art.

High molecular weight, random, bisphenol based copoly(phosphonate carbonate)s

The present invention relates to a continuous process for preparing lower dialkyl carbonates as main product and alkylene glycol as by-product by transesterification of a cyclic alkylene carbonate (e.g. ethylene carbonate or propylene carbonate) with lower alkyl alcohols in the presence of a catalyst and also the required purification of the dialkyl carbonate in a subsequent process step. To optimize the economics and energy efficiency of the process, additional devices are used for intermediate heating of the liquid streams in the apparatus.

Process for preparing dialkyl carbonates

The invention relates to a process for production of diaryl carbonate combined with the electrolysis of the resultant alkali metal chloride-containing process wastewater. The process according to the invention makes possible, inter alia, improved utilization in electrolysis of the alkali metal chloride-containing solution obtained in the production of diaryl carbonate.

Process for production of diaryl carbonate

The present invention relates to a continuous process for preparing lower dialkyl carbonates as main product and alkylene glycol as by-product by catalyzed transesterification of a cyclic alkylene carbonate (e.g. ethylene carbonate or propylene carbonate) with lower alcohols, where the reaction of the alkylene carbonate is carried out with an alcohol containing dialkyl carbonate in countercurrent, characterized in that introduction of a stream containing at least 99.5% by weight of alcohol takes place below the point of introduction for the alcohol containing dialkyl carbonate in a particular spacing ratio between the abovementioned points of introduction.

Process for preparing dialkyl carbonates from alkylene carbonates and alcohols

The present invention relates to a process for continuously preparing diaryl carbonates from dialkyl carbonates and at least one monohydroxyl compound in the presence of catalysts, and to the use thereof for preparation of polycarbonates. The alkylene glycol obtained in the preparation of the dialkyl carbonate used is recycled by oxidative carbonylation with carbon monoxide in the presence of a catalyst to give the cyclic alkylene carbonate which is in turn converted to the dialkyl carbonate. More particularly, the process utilizes the alkylene glycol obtained for the diphenyl carbonate preparation process (DPC process).

A combined process for the preparation of polycarbonate from bisphenols and diaryl carbonates, the monophenol liberated being reacted again for the preparation of the diaryl carbonate and the alkali metal halide forming in the preparation of the diaryl carbonate being converted by electrochemical oxidation, optionally over a gas diffusion electrode, into chlorine and alkali hydroxide solution, the chlorine being recycled into the preparation of the phosgene and the alkali hydroxide solution being recycled into the preparation of the diaryl carbonate.

Process for the preparation of polycarbonate

A process is described for producing polycarbonate and utilizing at least some of the process waste water by concentrating the sodium chloride-containing waste water phases for the electrolysis using osmotic membrane distillation, if appropriate with simultaneous dilution of the sodium hydroxide solution obtained from the electrolysis for the polycarbonate production process.

Process for producing polycarbonate

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Krefeld, Germany

Pieter Ooms