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Michael Bartsch

Gerd Haderlein

Robert Baumann

Tim Jungkamp

Jens Scheidel

Hermann Luyken

Wolfgang Siegel

Dagmar Pascale Kunsmann-Keitel

Peter Bassler

Tobias Aechtner

Marco Altmayer

Miquel Angel Flores

Peter Pfab

Petra Deckert

Ferenc Molnar

Klaus Ditrich

Klemens Massonne

Klaus Halbritter

Matthias Maase

Veit Stegmann

Michael Becker

Oliver Huttenloch

Harald Winsel

Ralf Noe

Miguel Flores

Rocco Paciello

Götz-Peter Schindler

Rainer Papp

Andreas Brodhagen

Wolfgang Ahlers

Christian Miller

Martin Volland

Werner Weinle

Peter Baβler

Dag Wiebelhaus

Olaf Kutzki

Dieter Vogt

Hans-Martin Polka

Verena Seitz

Verena Weiskopf

Alison Hewat

Christian Dienes

Miguel Angel Flores

Heinz Schafer

Thorsten Hofrichter

Alexander Tempel

Alexandre Tempel

Ute Reuther

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

Method for producing linear pentenenitrile

The present invention relates to a process for separating an enantiomer mixture of (R)- and (S)-3-amino-1-butanol optionally protected on the oxygen atom, and to a process for preparing essentially enantiomerically pure (R)-3-amino-1-butanol which optionally bears a protecting group on the oxygen atom.

Separation of an enantiomer mixture of (R)- and (S)-3-amino-1-butanol

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.

The invention relates to a process for the preparation of (S)-2-amino-1-propanol (L-alaninol) from (S)-1-methoxy-2-propylamine via the hydrochloride of (S)-2-amino-1-propanol and subsequent work-up.

Process for the preparation of (S)-2-amino-1-propanol (L-alaninol) from (S)-1-methoxy-2-propylamine

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

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

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

Ni(0) -containing catalyst system

Process for preparing aminodihalophosphines, diaminohalophosphines, triaminophosphines, phosphorous ester diamides, aminophosphines, diaminophosphines, phosphorous ester amide halides and aminophosphine halides with elimination of an acid in the presence of an auxiliary base, wherein the auxiliary base

Method for the separation of acids from chemical reaction mixtures by means of ionic fluids

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 is described for preparing a nickel(0)-phosphorus ligand complex containing at least one nickel(0)central atom and at least one phosphorus ligand, which comprises reducing a nickel(II) halide dried by azeotropic distillation in the presence of at least one phosphorus ligand.

Use of azeotropically dried nickel(ii) halogenides

A process is described for hydrocyanating 1,3-butadiene over at least one nickel(0) complex having phosphorus ligands as a catalyst, wherein the 1,3-butadiene is used in a mixture with n-butane and the mixture contains from 60 to 90% by volume of 1,3-butadiene and from 40 to 10% by volume of n-butane.

Method for the production of pentene nitriles from n-butane

A process is described for isomerizing pentenenitrile in a reactant stream, wherein the isomerization is effected over a heterogeneous catalyst in a distillation column in such a way that, during the isomerization of the isomerization reactant, it is distillatively depleted in relation to the isomerization product in the reaction column of the distillation column.

Isomerisation of cis-2-pentenenitrile to form 3-pentenenitrile in a reactive distillation

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Michael Bartsch