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Jens Scheidel

Hermann Luyken

Gerd Haderlein

Michael Bartsch

Robert Baumann

Tim Jungkamp

Wolfgang Siegel

Tobias Aechtner

Peter Pfab

Peter Bassler

Miquel Angel Flores

Dagmar Pascale Kunsmann-Keitel

Thomas Genger

Andreas Leitner

Petra Deckert

Matthias Kroner

Götz-Peter Schindler

Sebastian Emmerling

Peter Baβler

Guillermo Arens

Martin Dieterle

Hartwig Voss

Harald Schaefer

Daniel Flojhar

Klaus Joachim Müller-Engel

Michael Röper

Alexander Panchenko

Andreas Brodhagen

Arnd Garsuch

Christoph Adami

Andrea Haunert

Catharina Klanner

Hartwig Voβ

Christian Miller

Catharina Horstmann

Alfred Thome

Werner Weinle

Sigmar Bräuninger

Ferenc Molnar

Wolfram Stüer

Andreas Glass

Hans-Martin Polka

Verena Weiskopf

Christian Dienes

Miguel Angel Flores

Heinz Schafer

Thorsten Hofrichter

Alexander Tempel

Sigmar BRÄUNINGER

Tobias ÄChtner

Alexandre Tempel

The present invention relates to a new process for preparing polyisocyanates containing isocyanurate groups and being flocculation-stable in solvents from (cyclo)aliphatic diisocyanates.

Method for producing polyisocyanates of (cyclo)aliphatic diisocyanates which are flocculation-stable in solvents

The present invention relates to a novel process for preparing isocyanurate-comprising polyisocyanates of (cyclo)aliphatic diisocyanates that are especially stable to color drift in solvents.

Colour-stable curing compositions containing polyisocyanates of (cyclo)aliphatic diisocyanates

A process is described for preparing 3-pentenenitrile, characterized by the following process steps:

Method for producing linear pentenenitrile

Process for working up an exhaust gas from a system for producing hydroxylamine or hydroxylammonium salts by catalytic reduction of nitrogen monoxide with hydrogen, the exhaust gas containing nitrogen monoxide, hydrogen, dinitrogen monoxide, nitrogen and ammonia. At least some of the hydrogen present in the exhaust gas is separated off from the exhaust gas by means of a gas-tight membrane-electrode assembly which comprises at least one selectively proton-conducting membrane, a retentate side, a permeate side, and, on each side of the membrane, at least one electrode catalyst, wherein, on the retentate side of the membrane, at least some of the hydrogen is oxidized to protons at the anode catalyst and the protons, after crossing the membrane, are, on the permeate side, at the cathode catalyst according to (I) reduced to hydrogen and/or (II) reacted with oxygen to form water, the oxygen originating from an oxygen-containing stream which is contacted with the permeate side.

Process for working up an exhaust gas from a system for producing hydroxylamine or hydroxylammonium salts

A process for long-term operation of a continuous heterogeneously catalyzed partial dehydrogenation of a hydrocarbon to be dehydrogenated, in which a reaction gas mixture stream comprising the hydrocarbon to be dehydrogenated in a molar starting amount KW is conducted through an overall catalyst bed comprising the total amount M of dehydrogenation catalyst and the deactivation of the overall catalyst bed is counteracted in such a way that, with increasing operating time, the contribution to the conversion in the first third of the total amount M of dehydrogenation catalyst in flow direction decreases, the contribution to the conversion in the last third of the total amount M of dehydrogenation catalyst in flow direction increases, and the contribution to the conversion in the second third of the total amount M of dehydrogenation catalyst in flow direction passes through a maximum.

Process for long-term operation of a continuous heterogeneously catalyzed partial dehydrogenation of a hydrocarbon to be dehydrogenated

A method for producing 3-pentenenitrile is provided that includes: (a) isomerizing an educt stream containing 2-methyl-3-butenenitrile on at least one dissolved or dispersed isomerization catalyst to form a stream (1), which contains the isomerization catalyst(s), 2-methyl-3-butenenitrile, 3-pentenenitrile and (Z)-2-methyl-2-butenenitrile; (b) distilling the stream (1) to obtain a stream (2) as the overhead product, which contains 2-methyl-3-butenenitrile, 3-pentenenitrile and (Z)-2-methyl-2-butenenitrile and a stream (3) as the bottom product, which contains the isomerization catalyst(s); (c) distilling the stream (2) to obtain a stream (4) as the overhead product, which is enriched with (Z)-2-methyl-2-butenenitrile in comparison to stream (2), and a stream (5) as the bottom product, which is enriched with 3-pentenenitrile and 2-methyl-3-butenenitrile in comparison to stream (2); (d) distilling stream (5) to obtain a stream (6) as the bottom product, which contains 3-pentenenitrile and a stream (7) as the head product containing 2-methyl-3-butenenitrile.

A process is described for separating mixtures of isomeric pentenenitriles, in which at least one isomer is removed from the mixture, wherein the separation of the substance mixtures of isomeric pentenenitriles is effected distillatively under reduced pressure.

Method for the separation of pentenenitrile isomers

An process for preparing 3-pentenenitrile by hydrocyanating 1,3-butadiene, in which the process yield with regard to recycled 1,3-butadiene is maximized.

Method for producing 3-pentenenitrile by means of the hydrocyanation of 1,3-butadiene

A process for extractively removing homogeneously dissolved catalysts from a reaction effluent of a hydrocyanation of unsaturated mononitriles to dinitriles with a hydrocarbon H, including performing the steps of a) concentrating the reaction effluent before step b) by distillation at pressures of from 0.1 to 5000 mbar and temperatures of from 10 to 150&#xb0; C., b) adding a hydrocarbon H to the concentrated reaction effluent to obtain a stream I, and c) feeding stream I, without prior separation of the liquid phases, into an extraction apparatus and extracting it at a temperature T with the hydrocarbon H to obtain a stream II comprising the hydrocarbon H enriched with the catalyst and a stream III having a low catalyst content.

Extraction of nickel (0) complexes from nitrile mixtures with reduced rag formation

Method of producing compounds of the general formulaXPR(OR)&#x2003;&#x2003;Iawhere X is chlorine, bromine or iodine and Ris an organic radical, by reacting compounds of the general formulaXPR&#x2003;&#x2003;II,in which X has the meaning given above and Ris an organic radical, with compounds of the general formulaROH&#x2003;&#x2003;III,in which Rhas the meaning given above, to give a mixture IV, in that

Method for producing organic phosphorous compounds containing halogens

An adiponitrile/methylglutaronitrile preparation process includes distilling a reaction stream to obtain streamdepleted in pentenenitriles (bottom product) and streamenriched in pentenenitriles (top product); extracting streamobtaining streamenriched with extractant (top product) and streamdepleted in extractant (bottom product); distilling streamobtaining streamcomprising the catalyst (bottom product) and streamcomprising the extractant (top product); distilling streamobtaining stream(bottom product) and streamcomprising the extractant (top product); distilling streamobtaining streamcomprising catalyst degradation products, at least one promotor, adiponitrile and methylglutaronitrile (bottom product) and streamcomprising pentenenitriles (top product); distilling streamobtaining streamcomprising catalyst degradation products and the promotor(s) (bottom product) and streamcomprising adiponitrile and methylglutaronitrile (top product); distilling streamobtaining streamcomprising adiponitrile (bottom product) and streamcomprising methylglutaronitrile (top product).

Method for producing dinitriles

A process is described for preparing 3-pentenenitrile by hydrocyanating 1,3-butadiene, wherein 1,3-butadiene is reacted with hydrogen cyanide in the presence of at least one catalyst and the stream resulting therefrom is purified distillatively, the bottom temperature during the distillation not exceeding 140&#xb0; C.

Production of 3-pentenenitrile from 1,3-butadiene

A process for preparing biphenols of the general formula I  

Method for producing biphenols from monophenols

A process is described for continuously hydrocyanating 1,3-butadiene in the presence of at least one nickel(0) catalyst with chelate ligands, wherein 1,3-butadiene and hydrogen cyanide are used in a molar ratio of from 1.6:1 to 1.1:1.

Continuous method for the production of linear pentene nitriles

A process for preparing nickel(0)-phosphorus ligand complexes comprising at least one nickel(0) central atom and at least one phosphorus ligand by reacting a nickel(II) compound with a reducing agent in the presence of the ligand to give a reaction mixture, wherein

Process for producing nickel(0)-phosphorus ligand complexes

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Hirschberg, Germany

Jens Scheidel