Evonik Degussa Gmbh

Oxeno Olefinchemie Gmbh

Cord Knoop

Gerda Grund

Axel Hengstermann

Christian Lettmann

Juergen Lippe

Alfred Kaizik

Armin Matthias Rix

Martina Ortelt

Bernhard Scholz

Anne Rittsteiger

Alexander Martin Rüfer

Matthias Orschel

Robert Jansen

Jörg-Joachim Nitz

Joerg-Joachim Nitz

Guido Streukens

Dietmar Gubisch

Markus Schwarz

Joachim Schuler

Martin Maier

Wilfried B&uuml;schken

Jan Caßens

Anja Müller

Markus Galle

Jan Cassens

Michael D Hinton

Rolf Hirsch

Norbert Richter

Walter T&ouml;tsch

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

The invention relates to an improved process for preparing 3-aminomethyl-3,5,5-trimethylcyclohexylamine, referred to hereinafter as isophoronediamine or, in abbreviated form, IPDA, by: I. preparation of isophorone by catalyzed aldol condensations with acetone as reactant; II. reaction of isophorone with HCN to form isophoronenitrile (IPN, 3-cyano-3,5,5-trimethylcyclohexanone); III. catalytic hydrogenation and/or catalytic reductive amination (also referred to as aminative hydrogenation) of 3-cyano-3,5,5-trimethylcyclohexanone, hereinafter called isophoronenitrile or, in abbreviated form, IPN, to give the isophoronediamine.

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

The invention relates to an improved process for preparing trimethylhexamethylenediamine, hereinafter referred to as TMD for short, by hydrogenation of trimethylhexamethylenedinitrile, hereinafter referred to as TMN for short, in the presence of a shaped hydrogenation catalyst of the Raney type.

Method for production of trimethylhexamethylenediamine

Process for the hydrogenation of hydroformylation mixtures

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Cord Knoop