Bayer Materialscience Ag

Covestro Deutschland Ag

Bayer Aktiengesellschaft

Bayer Intellectual Property Gmbh

Covestro Intellectual Property Gmbh & Co. Kg

Johan Vanden Eynde

Pieter Ooms

Johann Rechner

Georg Ronge

Kaspar Hallenberger

Andre Düx

Thomas König

Ricarda Leiberich

Marc Buts

Andreas Bulan

Rainer Weber

Klemens Kohlgrüber

Karl-Heinz Köhler

Gabriel Denecker

Friedhelm Risse

Bert Ruytinx

Florian Lipski

Thomas Pancur

Frank Bruynseels

Michael Bierdel

Steffen K&uuml;hling

Rolf Bachmann

Wolfgang Ebert

Helmut-Werner Heuer

Uwe Hucks

Wolfgang Alewelt

Ulrich Liesenfelder

Hermann Kauth

Christian Kords

Volker Michele

Jörg Kirchhoff

Torsten Hagen

Jan Heijl

Michael Traving

Melanie Möthrath

Lars Frye

Thomas Koenig

Dirk Van Meirvenne

Lars Obendorf

Ursula Tracht

Franky Bruynseels

Erik Sluyts

Wim Wuytack

Henning Kahnis

Ing Johan Vaes

Arthur Susanto

Korbinian Krämer

Matthias Böhm

Carsten Buchaly

Stephan Laue

Weerachanan Somhom

Johan Vaes

Joerg Kirchhoff

Anja Ehrig

Ralph Schellen

René De Cleyn

Lydia Simon

Andreas Chrisochoou

Maarten De Bock

Johann Seeba

Stefaan De Vos

Klemens Kohlgrueber

Marcus Grünewald

Kristof Heylen

Somchai Kanjanasantisak

Guenter Olf

Frank Doebert

Andreas Stremmel

Christoph Biedron

Frank Quaeyhaegens

Johan Decloedt

Paul Van Dorst

Uwe Arndt

Karl-Heinz KÖHLER

Ronge Georg

Günther Olf

The present inventions relates to the preparation of 3,3,5-trimethylcyclohexylidene bisphenol. Especially, the present invention relates to the preparation of 3,3,5-trimethylcyclohexylidene bisphenol from 3,3,5-trimethylcyclohexanone and phenol in the presence of a gaseous acidic catalyst. The preparation comprises a first drying step and a second drying step wherein in the second drying step the temperature is increased in comparison to first drying step or in the second drying step the pressure is lowered in comparison to first drying step, or in second drying step both the temperature is increased and the pressure is lowered in comparison to the first drying step (d1).

Process for the preparation of 3,3,4-trimethylcyclohexylidene bisphenol (BP-TMC)

The invention relates to polycarbonates with extremely low residual levels of volatile constituents and thermal degradation products, and also improved optical properties, especially Yellowness Index (YI) and good thermal stability, from solvent-containing polymer melts. The invention further relates to an apparatus and a process for preparing these polycarbonates with the aid of a devolatilizing extruder with at least three devolatilizing zones, and zones for introducing entraining agent into dispersion are present upstream of at least three devolatilizing zones.

Ultra-high purity polycarbonates having good inherent color and thermal resistance and a device and a method for producing the same

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 invention relates to an efficient continuous method for producing polycarbonates according to the phase interface method.

Method for producing polycarbonate according to the phase interface method

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

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 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

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

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 invention relates to an apparatus and a process for devolatilizing solvent-containing polycarbonate solutions. By employing the inventive apparatus, polycarbonates with low residual values of volatile constituents are produced from solvent-containing polymer melts, which improved optical properties, especially yellowness index, with the aid of an apparatus combination of a flash devolatilizer and a vented extruder.

Device and method for degassing solvent-containing polycarbonate solutions

The invention relates to a process for the pretreatment of material surfaces in order to minimize the interaction between polycarbonate and metal and, in the processing and synthesis of polycarbonate, to obtain a high-quality polymer which in particular does not become discolored and is free of insoluble constituents.

Process and apparatus for the preparation of polycarbonate

The invention relates to an apparatus and a process for devolatilizing solvent-containing polycarbonate solutions. By employing the inventive apparatus, polycarbonates with low residual values of volatile constituents are produced from solvent-containing polymer melts, which improved optical properties, especially yellowness index, with the aid of an apparatus combination of a heatable tubular devolatilizer and a vented extruder.

Growing community of inventors

Zwijnaarde, Belgium

Johan Vanden Eynde