Bayer Aktiengesellschaft

Basf Aktiengesellschaft

Bayeraktiengesellschaft

Bayer Intellectual Property Gmbh

Peter Fischer

Wilfried Haese

Rolf Wehrmann

Friedrich-Karl Bruder

Wolfgang Ebert

Bernhard Hauer

Alexander Meyer

Claus-Peter Reisinger

Sven Michael Hansen

Hans-Peter Wirges

Michael Traving

Otto Immel

Wolfgang Alewelt

Uwe Stelzer

Silke Kratschmer

Joachim Genz

Gunther Ellendt

Rolf Schmid

Lothar Bunzel

Joachim Helbig

Ernst Meisert

Martin D&ouml;bler

Marco Roelofs

Wolfgang Wohlleben

Dietrich Liebsch

Wilhelm Hagen

Konrad Triebeneck

Andreas Fischer

Karl-Friedrich Zenner

Helmut Klappert

Sabine Lutz-Wahl

Ralf Kaufmann

Stephan Wendel

Rolf D Schmid

Hauke Smidt

Walter Levin

Johannes Werneburg

Hermann Fischer

Christoph Schwemler

Oliver Scherr

Claudia Schmidt-Dannert

Hans-H Schwarz

A process for the preparation of an aromatic carbonate is disclosed. The process entails reacting an aromatic hydroxy compound of the formula R&#x2014;(O&#x2014;H), with carbon monoxide and oxygen, optionally in a solvent and in the presence of catalyst components, characterized in that after an initial partial charge of R&#x2014;(O&#x2014;H)to the reaction mixture, the balance thereof is subsequently metered into the reaction mixture at least once in the course of the reaction.

Process for the preparation of diaryl carbonates

The preparation of quaternary salt phenolate solutions is disclosed. The preparation entails mixing an aqueous hydroxide-containing solution with an organic phase that contains phenol and quaternary salt, distilling off the water and precipitating and filtering off the resulting salt.

Process for the preparation of quaternary salt phenolate solutions

The invention relates to a process for the removal of deposits formed in a reaction apparatus by the precipitation of solids from a liquid reaction mixture, which process is characterized in that particles of a material that is inert under the reaction conditions are introduced into the reaction apparatus, which particles, by suitable mechanical circulation of the reaction mixture, are so moved through the reactor that, during the reaction, by striking the walls or other built-in elements, they abrasively remove precipitates adhered thereto.

Method for removing deposits from chemical reactors

A process for the separation a substantially adduct-free diaryl carbonate from reaction solution is disclosed. The process entails obtaining a solution that contains diaryl carbonate, catalyst system components and an aromatic solvent, lowering the temperature of the solution, optionally in the presence of a nucleating agent, to produce a crystallization product, and washing the crystallization product with an anhydrous wash solution to remove catalyst residues and impurities.

Separation of impurities and/or valuable substances from solutions containing diaryl carbonate by solution crystallization

A process for producing diaryl carbonate is disclosed. The process entails forming a reaction mixture wherein reacting are an aromatic hydroxy compound corresponding to the formulaR&#x2014;O&#x2014;H&#x2003;&#x2003;(II),wherein R denotes a C-aromatic hydrocarbon radical, with CO and Oin the presence of a catalyst system. The catalyst system contains components a) a Group VIII B metal compound, b) at least one second metal compound, c) a bromide compound, and d) a base. The process entails introduction of one or more of components a) to d) to the reaction mixture in more than one increment in the course of the reaction.

Process for producing diaryl carbonates

Process for separating reaction mixtures and recycling quaternary salts and bases

A process for the separation and recycling of catalyst components from a chemical reaction mixture is disclosed. The process entails at least one extraction step.

Process for the separation of reaction mixtures and the recirculation of quaternary salts

The present invention provides a two-stage process for the production of polyester carbonates with aliphatic dicarboxylic acids, the polyester carbonates obtained thereby, a process for the production of extrudates and molded articles from the polyester carbonates, and the extrudates and molded articles obtained thereby.

Production of polyester carbonates

A process for the preparation of a solution of a quaternary cation and an anion from a deprotonated hydroxy aromatic in an organic solvent by means of a reactive extraction of a quaternary salt in the presence of an aqueous hydroxide solution, a hydroxy aromatic and an organic solvent is disclosed. Also disclosed is a process for the recycling of a quaternary salt phenolate solution from a reaction mixture.

Process for the preparation of organic solutions

A thermoplastic molding composition comprising polycarbonate resin having improved mold release properties is disclosed the composition contain polycarbonate resin and 0.005 to 5.0% relative to the weight of the composition of at least one hydrocarbon in the form of C15 -methyl-branched alkane. The hydrocarbon is characterized in that the weight proportion of its branches is 5 to 30 percent relative to the weight of carbons in the alkane chain.

Polycarbonate molding compounds with good demolding properties and molded bodied and semifinished products produced from the same

The invention relates to a process for the oxidation of substituted trimethylcyclohexenyl compounds in the presence of microorganisms of the order Actinomycetales and to the use of microorganisms in oxidation reactions.

Method for the oxidation of substituted trimethylcyclohexenyl compounds with bacteria of the family Streptomycetaceae

Process for preparing optically active amines

This invention relates to a process for the preparation of an iron catalyst used for the hydrogenation of organic compounds comprising partially oxidizing iron or an iron alloy in particulate form at an elevated temperature in the presence of gaseous oxygen until a weight gain of from 5% to 32% is obtained; and then reducing the partially oxidized iron or iron alloy at an elevated temperature in a stream of hydrogen. The invention also relates to a process for the preparation of primary amines comprising catalytically hydrogenating nitriles corresponding to said primary amines in the presence of an iron catalyst of the invention.

Process for the preparation of an iron catalyst and a process for the

The instant invention is directed to a process for the production of diisocyanatodiphenyl methane isomers having an adjusted content of chlorine compounds comprising:

Process for the production of diisocyanatodiphenyl methane isomers with

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Kö'ln, Germany

Peter Fischer