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:
Apr. 10, 2018
Filed:
Mar. 28, 2016
Evonik Degussa Gmbh, Essen, DE;
Stephan Kohlstruk, Gladbeck, DE;
Anne Rittsteiger, Olfen, DE;
Alexander Martin Ruefer, Recklinghausen, DE;
Norbert Schlueter, Gescher, DE;
Sven Schneider, Datteln, DE;
Sabrina Sowka, Duelmen, DE;
Guido Streukens, Wuppertal, DE;
Stefan Roeder, Sinntal, DE;
Monika Berweiler, Maintal, DE;
Evonik Degussa GmbH, Essen, DE;
Abstract
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.