Celanese Chemicals Europe Gmbh

Evonik Degussa Gmbh

Evonik Operations Gmbh

Degussa Aktiengesellschaft

Jürgen Herwig

Martin Roos

Helmut Bahrmann

Ernst Wiebus

Hans Bohnen

Carl Dieter Frohning

Klaus Bergrath

Michael Riedel

Robert Eckl

Wilfried Fenske

Florian Rampf

Wolfgang Zgorzel-Ski

Kurt Schalapski

Wolfgang Greb

Kévin Micoine

Miriam Ammer

Richard Fischer

Yvonne Groß-Onnebrink

Andreas Berlineanu

Gudula Beuers

Kirsten Luce

Siegfried Jittenmeier

Philip Kemper

Georg Oenbrink

Roland Wursche

Ralf Meier

Thomas Quandt

Dirk Kuppert

Goetz Baumgarten

Stefan Leininger

Alexander Pschantka

Margit Bukohl

Peter Wasserscheid

Peter Kreis

Luca Cameretti

Harald Häger

Kai-Steffen Krannig

Norbert Wilczok

Frank Weinelt

Jörg Lohmar

Bernd Günzel

Marina Lazar

Jens Döring

Anita Völkel

Christian Schnitzer

Dietmar Hoff

Roy Van Hal

Stefanie Sturm

Peter Skutta

Yvonne Gross-Onnebrink

Angélique Bétard

Manfred Thiery

Wilhelm Brügging

The invention relates to polybutadiene, which contains the monomer units derived from 1,3-butadiene having a vinyl double bond in a proportion of 25 to 75 mole percent, having a trans-double bond in a proportion of 0 to 10 mole percent and a cis-double bond in a proportion of 25 to 75 mole percent, wherein the totality of the monomer units (A), (B) and (C) is supplemented to 100 mole percent, and which is characterized in that it has a number-average mole mass of 1,000 to 3,000 g/mole. The invention further relates to a method for producing polybutadienes, the use of the polybutadiene according to the invention and compositions containing polybutadiene according to the invention.

Polybutadiene, production and use thereof

A process has the ability to produce polyalkenamer-containing compositions. Stages of the process include converting at least one cycloalkene by ring-opening metathetic polymerization to obtain a polyalkenamer-containing product mixture, and working up the product mixture to remove at least one of a monomer and an oligomer of the at least one cycloalkene to obtain the polyalkenamer-containing composition. The working up stage is effected by a diafiltration.

Process for preparing polyalkenamers for packaging applications

A catalyst composition is useful for producing a ketone from a compound containing at least one epoxide group, and the catalyst composition contains at least one precious metal; and at least one mixed oxide; wherein the mixed oxide contains zirconium dioxide and silicon dioxide; wherein the precious metal is supported and the support is not entirely made of the mixed oxide; and wherein a mass ratio of zirconium dioxide to silicon dioxide in the mixed oxide is 86:14 to 99.9:0.1.

Catalyst system for producing ketones from epoxides

The invention relates to a method for the purification of poly(arylene ethers) of formula (I) in which m=0 to 1.0, n=1.0-m, and Ar, Ar, Arand Arindependently represent divalent arylene groups. The compound of formula (I) is produced in a first step 1, with a raw product being obtained by bringing a metal or ammonium salt of divalent dihydroxy derivatives of Aror Arinto contact with one or more dihalogenated derivatives of Arand/or Ar, in the presence of a solvent LM1. A precipitate that is present, if appropriate, is separated (step B) so as to obtain a solution L which then undergoes a membrane filtration (step C). 

Method for the purification of poly(arylene ethers)

Preparation of cyclododecatriene in a continuous or discontinuous process by trimerization of butadiene in the presence of a catalyst system and a solvent, the crude cyclododecatriene obtained being able to be isolated by means of distillation. The cyclooctadiene formed as by-product can likewise be isolated from the crude product.

Process for preparing cyclododecatriene

A process for preparing sulfonated arylphosphines by reaction of arylphosphines with oleum, wherein, after reaction of the arylphosphines with oleum, the sulfonation mixture is firstly diluted with water, an inert gas stream is then passed through the diluted sulfonation mixture until SOis no longer liberated from the diluted sulfonation mixture and the latter is then worked up further in a customary manner and its use.

Process for preparing sulfonated arylphosphines

The present invention relates to a hydroformylation method by conversion of olefins or olefinically unsaturated compounds in the presence of at least one rhodium compound and in the presence of sulfonated arylphosphines in ionic liquids, which are based on a quaternary singly-charged ammonium ion or the equivalent of a multiply charged ammonium ion and organic sulfonates or sulfates.

Method for the production of aldehydes

A process for preparing solutions of sulfonated arylphosphines comprising reacting arylphosphines with oleum, diluting the sulfonation mixture with water, extracting the diluted sulfonation mixture with a solution of a water-insoluble organic solvent, reacting the organic phase with a solution of an inorganic base in water, adjusting the resulting aqueous solutin of sulfonated arylphosphines to a pH of up to 3 by addition of an acid, and passing an inert gas stream through the aqueous solution comprising sulfonated arylphosphines until sulfur is no longer liberated from the aqueous solution of sulfonated arylphosphines.

The epoxidation of cyclic, at least monounsaturated alkenes is conducted by a process, which comprises conducting the epoxidation of a cyclic, at least monounsaturated alkene in the presence of an oxidant in a reaction medium that contains at least 1% by weight of the saturated cyclic alkane corresponding to the cyclic, at least monounsaturated alkene. In a preferred embodiment the reaction medium contains at least 2.5% by weight of the saturated cyclic alkane corresponding to the cyclic, at least monounsaturated alkene.

Process for the epoxidation of cyclic alkenes

The invention relates to a method for producing sulfonated aryl phosphines by reacting aryl phosphines with oleum. After reacting the aryl phosphines with oleum, the sulfonation mixture is firstly diluted with water and an inert gas stream is then fed through the diluted sulfonation mixture until SO is no longer released from the diluted sulfonation mixture. Afterwards, the sulfonation mixture is subsequently processed in a usual manner. The invention also relates to a method for producing solutions of sulfonated aryl phosphines by reacting the aryl phosphines with oleum, diluting the sulfonation mixture with water, extracting the aqueous solution using an organic solution consisting of an amine, and subsequently carrying out a reextraction using an aqueous solution having an inorganic base. According to the invention, the solution containing aqueous sulfonated aryl phosphines is adjusted to a pH value of up to 3 by adding acid, and an inert gas stream is then fed through the aqueous solution until sulfur dioxide is no longer released. The invention additionally relates to an aqueous catalyst solution containing rhodium and an aqueous solution of sulfonated aryl phosphines, treated as defined by the invention, for carrying out the hydroformylation of olefinically unsaturated compounds, and relates to the use thereof for carrying out the same.

Method for producing sulfonated aryl phosphines

An efficient process for the production of substituted 10-chloro-phenoxaphosphines or 10 bromo-phenoxaphosphines by reaction of substituted diphenyl ethers with phosphorus trihalogenide in the presence of at least one Lewis acid and subsequent treatment with an amine.

Process for the production of substituted 10-chloro-phenoxaphosphines or 10-bromo-phenoxaphosphines

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Hünxe, Germany

Jürgen Herwig