The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 21, 2015
Filed:
Nov. 18, 2011
Markus Galle, Dortmund, DE;
Gerda Grund, Coesfeld, DE;
Axel Hengstermann, Senden, DE;
Michael D Hinton, Theodore, AL (US);
Rolf Hirsch, Marl, DE;
Robert Jansen, Bottrop, DE;
Cord Knoop, Haltern am See, DE;
Christian Lettmann, Coesfeld, DE;
Juergen Lippe, Gelsenkirchen, DE;
Martin Maier, Herne, DE;
Joerg-joachim Nitz, Oberhausen, DE;
Matthias Orschel, Muenster, DE;
Martina Ortelt, Duelmen, DE;
Norbert Richter, Marl, DE;
Armin Rix, Marl, DE;
Markus Schwarz, Haltern am See, DE;
Guido Streukens, Wuppertal, DE;
Markus Galle, Dortmund, DE;
Gerda Grund, Coesfeld, DE;
Axel Hengstermann, Senden, DE;
Michael D Hinton, Theodore, AL (US);
Rolf Hirsch, Marl, DE;
Robert Jansen, Bottrop, DE;
Cord Knoop, Haltern am See, DE;
Christian Lettmann, Coesfeld, DE;
Juergen Lippe, Gelsenkirchen, DE;
Martin Maier, Herne, DE;
Joerg-Joachim Nitz, Oberhausen, DE;
Matthias Orschel, Muenster, DE;
Martina Ortelt, Duelmen, DE;
Norbert Richter, Marl, DE;
Armin Rix, Marl, DE;
Markus Schwarz, Haltern am See, DE;
Guido Streukens, Wuppertal, DE;
Evonik Degussa GmbH, Essen, DE;
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.