Evonik Degussa Gmbh

Evonik Operations Gmbh

Anne Rittsteiger

Stephan Kohlstruk

Alexander Martin Rüfer

Martina Ortelt

Dirk Fuchsmann

Jörg-Joachim Nitz

Michael Demming

Denise Ott

Christine Stemmer

Anja Stasch

Monika Berweiler

Axel Hengstermann

Guido Streukens

Sven Schneider

Sabrina Sowka

Eike Langkabel

Stefan Röder

Jaclyn Balthasar

Anja Müller

Norbert Schlüter

Dirk Hoppe

Matthias Orschel

Cord Knoop

Matthias Mendorf

Jan Caßens

Markus Galle

Jan Cassens

Norbert Schlueter

Jorn Walscharts

Stefan Roeder

Alexander Martin Ruefer

Anja Poschen

Alexander Martin RÜFER

The present invention relates to a process for hydrogenating nitrile compounds to amino compounds, in which the cross-sectional loading of the reactor during the hydrogenation is less than or equal to 4.0 kg/m*s, based on the liquid phase.

Process for preparing amino compounds from nitrile compounds

The present invention is directed to a process for fine purification of isophoronediamine from the production of isophoronediamine wherein the crude isophoronediamine I is subjected to a fine purification by means of two vacuum distillation columns, wherein I. in the first vacuum distillation column K I low-boiling by-products still present are removed, and a crude IPDA II is transferred from the bottom of K I into the vacuum distillation column K II, II. and in the second vacuum distillation column K II the isophoronediamine is obtained in pure form overhead and separated from the organic residues, wherein the first condenser is a partial condenser and the pure IPDA is removed therein, and wherein the second condenser is a total condenser and the residual portion of the vapor stream from K II is completely condensed therein and recycled as return stream into the first vacuum distillation column K I.

Purification of crude isophoronediamine by partial condensation in series with total condensation

A process for fine purification of isophoronediamine (IPDA), including producing IPDA by aminating hydrogenation of isophorone nitrile in the presence of at least ammonia, hydrogen, a a hydrogenation catalyst and optionally further additions to obtain a crude IPDA, and subjecting the crude IPDA to a fine purification via two vacuum distillation columns, wherein in the first vacuum distillation column the removal of any remaining relatively low-boiling byproducts is effected and in the second vacuum distillation column the IPDA is obtained in pure form as tops and thus separated from the organic residues, and wherein the first vacuum distillation column has vacuum distillation column has a partial condenser fitted to it.

Coupling of distillative purification with a partial condenser for pre-purification of isophoronediamine

A compound of the structural formula as a hardener in epoxy resin composition.

2-(3-(aminomethyl)-3,5,5-trimethylcyclohexyl)propane-1,3-diamine, a process for its production and use

An epoxy resin composition including A) at least one epoxy compound and B) a hardener composition including B1) 0.1%-100% by weight of 2-(3-(aminomethyl)-3,5,5-trimethylcyclohexyl)propane-1,3-diamine, and B2) 99.9%-0% by weight of at least one further diamine and/or polyamine, where the stoichiometric ratio of the epoxy groups of A) and the number of active hydrogen atoms of the functional groups of B) varies from 1:2 to 2:1.

Epoxy resin composition comprising 2-(3-(aminomethyl)-3,5,5-trimethylcyclohexyl)propane-1,3-diamine (AM-CPDA) as hardener

An epoxy resin composition including A) at least one epoxy compound, and B) a hardener composition including B1) from 0.1%-100% by weight of 2-(2,2,6,6-tetramethylpiperidin-4-yl)propane-1,3-diamine, and B2) from 99.9%-0% by weight of at least one further diamine and/or polyamine, where the stoichiometric ratio of the epoxy groups of A) and the number of active hydrogen atoms of the functional groups of B) varies from 1:2 to 2:1.

Epoxy resin composition comprising 2-(2,2,6,6-tetramethylpiperidin-4-yl)propane-1,3-diamine as hardener

The present invention relates to 2-(2,2,6,6-tetramethylpiperidin-4-yl)propane-1,3-diamine, which can be used as hardener in epoxide applications.

Hardener composition including 2-(2,2,6,6-tetramethylpiperidin-4-yl)propane-1,3-diamine

A compound of the structural formula 1 A process for producing 2-(3-(aminomethyl)-3,5,5-trimethylcyclohexyl)propane-1,3-diamine by A) reacting isophorone nitrile and malononitrile to afford the intermediate 2-(3-cyano-3,5,5-trimethylcyclohexylidene)malononitrile, and B) hydrogenating 2-(3-cyano-3,5,5-trimethylcyclohexylidene)malononitrile in the presence of at least one catalyst. In another embodiment, the hydrogenation in step B) of the process is performed at 20-120&#xb0; C. and at 20-300 bar.

Process for preparing isophoronediamine, characterized in that

Process for preparing 3 aminomethyl-3,5,5-trimethylcyclohexylamine

Isophoronediamine, is prepared by A) subjecting isophoronenitrile directly in one stage to aminating hydrogenation to give isophoronediamine in the presence of ammonia, hydrogen, a hydrogenation catalyst and an optional additive, and in the presence or absence of an organic solvent; or B) first converting isophoronenitrile fully or partly in at least two or more than two stages to isophoronenitrile imine, and subjecting the isophoronenitrile imine to aminating hydrogenation to give isophoronediamine as a pure substance or in a mixture with another component and/or isophoronenitrile, in the presence of at least ammonia, hydrogen and a catalyst.

Process for preparing 3-aminomethyl-3,5,5-trimethylcyclohexylamine

A process for producing 2-(2,2,6,6-tetramethylpiperidin-4-yl)propane-1,3-diamine by A) reacting triacetonamine (TAA) and malononitrile to afford the intermediate 2-(2,2,6,6-tetramethylpiperidin-4-ylidene)malononitrile, and B) hydrogenating 2-(2,2,6,6-tetramethylpiperidin-4-ylidene)malononitrile in the presence of at least one catalyst. In another embodiment, the hydrogenation in step B) of the process is performed at 20-120&#xb0; C. and at 20-300 bar. In another embodiment, the hydrogenation in step B) of the process is performed in two stages at 20-120&#xb0; C. and at 20-300 bar.

Process for producing 2-(2,2,6,6-tetramethylpiperidin-4-yl)propane-1,3-diamine

A diamine 2-(3,3,5-trimethylcyclohexyl)propane-1,3-diamine of formula 1  and a process for producing 2-(3,3,5-trimethylcyclohexyl)propane-1,3-diamine by A) reacting isophorone (IP) and malononitrile to afford the intermediate 2-(3,5,5-trimethylcyclohex-2-en-1-ylidene)malononitrile, and B) hydrogenating 2-(3,5,5-trimethylcyclohex-2-en-1-ylidene)malononitrile in the presence of at least one catalyst. In another embodiment, the hydrogenation in step B) of the process is performed at 20-120&#xb0; C. and at 20-300 bar.

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Olfen, Germany

Anne Rittsteiger