Evonik Degussa Gmbh

Juergen Lippe

Gerda Grund

Christian Lettmann

Cord Knoop

Armin Matthias Rix

Martina Ortelt

Axel Hengstermann

Robert Jansen

Matthias Orschel

Joerg-Joachim Nitz

Guido Streukens

Markus Schwarz

Martin Maier

Markus Galle

Michael D Hinton

Rolf Hirsch

Norbert Richter

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

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Gelsenkirchen, Germany

Juergen Lippe