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

US9085506B2 · kind B2 · utility

Assignee

• EVONIK DEGUSSA GMBH · DE

Inventors

• Markus Galle · Dortmund, DE
• Gerda Grund · Coesfeld, DE
• Axel Hengstermann · Senden, DE
• Michael D Hinton · Theodore, US
• Rolf-Burkhard Hirsch · Dormagen, DE
• Robert Jansen · Collinsville, US
• Cord Knoop · Haltern am See, DE
• Christian Lettmann · Coesfeld, DE
• Juergen Lippe · Gelsenkirchen, DE
• Martin Maier · Asperg, DE
• Joerg-Joachim Nitz · Essen, DE
• Matthias Orschel · Munster, DE
• Martina Ortelt · Flein, DE
• Norbert Richter · Beverungen, DE
• Armin Matthias Rix · Marl, DE
• Markus Schwarz · Haltern am See, DE
• Guido Streukens · Wuppertal, DE

Key dates

• Filing date: Nov 18, 2011
• Grant date: Jul 21, 2015
• Expiry date: Nov 18, 2031

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/582
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

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.