Bayer Aktiengesellschaft

Bayer Materialscience Ag

Covestro Deutschland Ag

Bayer Intellectual Property Gmbh

Other

Frx Polymers, Inc.

Teijin Limited

Johann Rechner

Hans-Josef Buysch

Carsten Hesse

Pieter Ooms

Johan Vanden Eynde

Kaspar Hallenberger

Andreas Bulan

Rainer Weber

Paul Wagner

Michael Bierdel

Georg Ronge

Volker Wege

Ursula Jansen

Andre Düx

Ulrich Liesenfelder

Eberhard Zirngiebl

Norbert Schon

Frank Bruynseels

Thomas König

Klemens Kohlgrüber

Claus-Peter Reisinger

Michael Traving

Thomas Koenig

Marc Buts

Rob Eek

Friedrich-Karl Bruder

Christoph Gürtler

Helmut-Werner Heuer

Thomas Ernst Müller

Ralf Dujardin

Michael Prein

Yun Chen

Dieter Freitag

Lawino Kagumba

Reiner Rudolf

Ulrich Notheis

Ricarda Leiberich

Dieter Kaufmann

Pin Go

Hans-Peter Wirges

Stephan Konrad

Rafael Warsitz

Carsten Conzen

Friedhelm Risse

Bert Ruytinx

Matthias Böhm

Martin Friedrich

Ing Johan Vaes

Klemens Kohlgrueber

Angelina Prokofieva

Franco Doro

Berit Krauter

Alexander Klausener

Wolfgang Ebert

Walter Leitner

Uwe Hucks

Aurel Wolf

Wolfgang Alewelt

Burkhard Köhler

Steffen Kuhling

Gottfried Zaby

Silke Kratschmer

Thomas Elsner

Christine Mendoza-Frohn

Jörg Kirchhoff

Jorg-Dietrich Jentsch

Torsten Hagen

Arno Nennemann

Sascha Plug

Reinhard Schomacker

Daniel-Gordon Duff

Stefan Westernacher

Ursula Tracht

Hans-Erich Gasche

Konstadinos Douzinas

Helmut Meyer

Johan Vaes

Werner Bäcker

Wim Wuytack

Joerg Kirchhoff

Melanie Moethrath

Martin Leipnitz

Stephan Laue

J&ouml;rg-Dietrich Jentsch

Stephan Kabelac

Juergen Hecke

Wolfgang Kern

Guido Naberfeld

Stephan Bahnmuler

Gerhard Langstein

Julia Hitzbleck

Patrick Theato

Bernd Henning

Daniel Kessler

Thomas Fritz

Guenter Olf

Dirk Jahn

Helmut Mothes

Frank Doebert

Andreas Stremmel

The invention relates to a method for flexibly controlling the use of hydrochloric acid having an HCl concentration of at least 10 wt %, in particular at a volume flow rate of at least 1 m/h, obtained from a continuous chemical production process (A). In the method, purified hydrochloric acid () from a hydrochloric acid store (E) is optionally fed to a dispatch station (H), an HCl electrolysis station (F) and a chloralkali electrolysis station (L), which are consumption points for the hydrochloric acid, or to a neutralisation station (G) in that if one or more of said consumption points (H, F, L) is not available or if there are bottlenecks at the consumption points (H, F, L), the hydrochloric acid () is fed to the neutralisation station (G) and neutralised with concentrated alkali solution (), in particular with concentrated sodium hydroxide solution, and the resulting salt solution () is fed either to the chloralkali process station (L) or to a disposal station (M).

Method for flexibly controlling the use of hydrochloric acid from chemical production

A process for extruding plastic compositions is provided. The process comprises providing a multi-screw extruder with screw elements and conveying, kneading, mixing, degassing or compounding the plastic compositions in the multi-screw extruder using the screw elements.

Process for extruding plastic compositions

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 relates to a process for extruding plastic compositions, in particular polymer melts and mixtures of polymer melts, above all thermoplastics and elastomers, particularly preferably polycarbonate and polycarbonate blends, also with the incorporation of other substances such as for example solids, liquids, gases or other polymers or other polymer blends with improved optical characteristics, with the assistance of a multi-screw extruder with specific screw geometries.

Method for extruding plastic materials

The invention relates to a process for extruding plastic compositions. The process in particular relates to the conveying, kneading and/or mixing of plastic compositions, in particular of polymer melts and mixtures of polymer melts, above all thermoplastics and elastomers, particularly preferably polycarbonate and polycarbonate blends, also with the incorporation of other substances such as for example solids, liquids, gases or other polymers or other polymer blends.

Method for extruding plastic masses

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 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 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

A method for separating electrolyte-containing water from an organic phase by means of permeation on a hydrophobic separating means. The permeated organic solution is substantially depleted in water and the retained water is enriched with electrolytes.

Method for separating an organic phase from an electrolyte-containing aqueous and organic phase

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Kempen, Germany

Johann Rechner