Covestro Deutschland Ag

Arlanxeo Deutschland Gmbh

Lanxess International Sa

Bayer Aktiengesellschaft

Bayer Materialscience Ag

H. C. Starck Gmbh & Co

Bayer Intellectual Property Gmbh

Lanxess Deutschland Gmbh

H. C. Starck, Gmbh & Co Kg

Ricarda Leiberich

Hanns-Ingolf Paul

Udo Wiesner

Joachim Ritter

Johan Vanden Eynde

Kaspar Hallenberger

Paul Wagner

Rolf Feller

Karl-Heinz Köhler

Gabriel Denecker

Florian Lipski

Henning Kahnis

Korbinian Krämer

Johann Rechner

John Lovegrove

Jörg Kirchhoff

Weerachanan Somhom

Holger Luesgen

Hans-Josef Buysch

Pieter Ooms

Juliane Meese-Marktscheffel

Eberhard Zirngiebl

Norbert Schon

Georg Ronge

Adam Gronowski

Viktor Stoller

Josef Schmoll

Christoph Schild

Andre Düx

Wolfgang Kummer

Daniel Gordon Duff

Friedhelm Risse

Hans-Erich Gasche

Ursula Tracht

Ulrich Krynitz

Hans-Martin Weber

Carsten Kreuder

Jorg Kirchhoff

Joerg Kirchhoff

Ralf Demuth

Bernd-Michael K&ouml;nig

Wim Wuytack

Ralph Schellen

Thomas Linn

Hans-Joachim Raatz

Mathias Benz

Evelyn Pross

Carsten Buchaly

Wolfgang Schweda

Michael Berger

Holger Lusgen

Guenter Olf

Daniel Duff

John George Lovegrove

Karl-Heinz KÖHLER

Holger LÜSGEN

John George Arnold Lovegrove

Günther Olf

The invention relates to an efficient process for the preparation of isoolefin polymers such as polyisobutene or butyl rubber by polymerization of isobutene and optionally further monomers in the presence of an initiator system prepared by continuously contacting at least one boron or aluminium compound and at least one initiator.

Process for the production of isoolefin polymers with improved initiator system preparation

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

The invention relates to an energy efficient, environmentally favorable process for the preparation of brominated butyl rubbers, that uses a bromination agent and a oxidizing agent in order to enhance the utilization of bromine contained in the bromination agent. In a preferred embodiment a common medium for both solution polymerization and subsequent bromination of the rubber is employed.

Process for producing brominated butyl rubber

The present invention relates to a method to control a liquid feed stream carried out by measuring at least one spectrum of the liquid feed stream comprising an initiator or catalyst, determining its activity using a predictive model on the basis of said spectrum and adjusting the feed streams and/or the preparation conditions of the feed stream comprising the initiators or catalysts in order to attain or maintain a desired level of total activity. In a further aspect the invention relates to a controlled process for the preparation of polymers in a polymerization reactor by contacting liquid feed streams comprising monomers and initiators or catalysts, whereby the control of the feed streams entering the polymerization reactor and/or the initiator or catalyst preparation is carried out by measuring at least one spectrum of the liquid feed stream comprising an initiator or catalyst, determining its activity using a predictive model on the basis of said spectrum and adjusting the feed streams and/or the preparation conditions of the feed stream comprising the initiators or catalysts in order to attain or maintain a desired level of total activity within the polymerization reactor. More particularly, the invention relates to a method for controlling the activity of aluminum containing initiators in a process for the co-polymerization of isolefins and multiolefins, in particular isobutylene and isoprene. The present invention further to device and a chemical plant suitable to operate said process.

Activity monitoring and polymerization process control

The present invention relates to a reactor () and a process for continuous polymerization, where the reactor () has an essentially tubular reactor housing (). The reactor housing () has a drive () which runs along the geometric central axis () in the flow direction () and is configured as a central shaft. A rotatably arranged scraper or wiper () is provided within the reactor housing (); the scraper or wiper () has at least one scraper or wiper blade () to run along an interior side () of the reactor housing (). The rotational movement of the scraper or wiper () results in radial mixing of a stream within the reactor housing () which dominates gravity effects and, by virtue of shaping of the scrapers or wipers, optionally makes plug flow or a loop flow or backflow within the reactor () or else via an additional external pumped circulation system () possible. This allows the reaction conditions in the axial direction of the reactor housing () to be predicted and individually suitable reaction conditions to be set and controlled along the reactor housing, so that, in particular, a desired molecular weight distribution can be set.

Reactor and method for continuous polymerization

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 present invention relates to a reactor () and a process for continuous polymerization, where the reactor () has an essentially tubular reactor housing (). The reactor housing () has a drive () which runs along the geometric central axis () in the flow direction () and is configured as a central shaft. A rotatably arranged scraper or wiper () is provided within the reactor housing (); the scraper or wiper () has at least one scraper or wiper blade () to run along an interior side () of the reactor housing (). The rotational movement of the scraper or wiper () results in radial mixing of a stream within the reactor housing () which dominates gravity effects and, by virtue of shaping of the scrapers or wipers, optionally makes plug flow or backflow within the reactor () possible. This allows the reaction conditions in the axial direction of the reactor housing () to be predicted and individually suitable reaction conditions to be set and controlled along the reactor housing, so that, in particular, a desired molecular weight distribution can be set.

The invention relates to a method for producing lithium-transition metal mixtures of general formula Li(MM)O, wherein Mrepresents nickel, cobalt or manganese, Mrepresents chromium, cobalt, iron, manganese, molybdenum or aluminium, and is different from M, n is 2 if Mrepresents manganese and is 1 otherwise, x is comprised between 0.9 and 1.2, y is comprised between 0.5 and 1.0 and z is comprised between 1.9 and 2.1. According to the inventive method, an intimate mixture composed of transition metal compounds containing oxygen and of a lithium compound containing oxygen is calcinated, said mixture being obtained by processing a solid powder transition metal compound with a solution of said lithium compound, and then drying. At least the Mcompound is used in powder form having a specific surface of at least 20 m/g (BET) and calcination is carried out in a fluidised bed.

Method for producing lithium-transition metal mixtures

The present invention relates to a continuous adiabatic process for preparing nitrochlorobenzene, in which the waste sulfuric acid produced during the practice of the process is reconcentrated and recycled into the nitration reaction.

Continuous adiabatic process for preparing nitrochlorobenzene

Organic carbonates containing at least one aromatic ester group can be obtained in a continuous manner from carbonates containing at least one aliphatic ester group and a phenolic compound in the presence of a transesterification catalyst known per se by carrying out the reaction in at least two stirred containers connected one behind the other in such a way that, in each case, the phenolic compound is metered in liquid form into the first stirred container and the carbonate containing at least one aliphatic ester group is metered in liquid form into one or more of the stirred containers. The carbonate containing at least one aromatic ester group is removed in liquid form from the last stirred container. Volatile reaction products, for example alcohol which has been cleaved out or a dialkyl carbonate are removed in gaseous form from one or more stirred containers.

Process for the continuous production of aryl carbonates

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Neu-Isenburg, Germany

Ricarda Leiberich