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:
Jun. 13, 2006
Filed:
Aug. 28, 2002
Frank Funke, Mannheim, DE;
Thomas Hill, Mannheim, DE;
Johann-peter Melder, Böhl-Iggelheim, DE;
Ekkehard Schwab, Neustadt, DE;
Walter Himmel, Grünstadt, DE;
Erhard Henkes, Einhausen, DE;
Hermann Petersen, Grünstadt, DE;
Reinhard Körner, Frankenthal, DE;
Frank Funke, Mannheim, DE;
Thomas Hill, Mannheim, DE;
Johann-Peter Melder, Böhl-Iggelheim, DE;
Ekkehard Schwab, Neustadt, DE;
Walter Himmel, Grünstadt, DE;
Erhard Henkes, Einhausen, DE;
Hermann Petersen, Grünstadt, DE;
Reinhard Körner, Frankenthal, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
In a process for preparing 3-aminomethyl-3,5,5-trimethylcyclohexylamine (isophoronediamine, IPDA) having a cis/trans isomer ratio of at least 70/30 from 3-cyano-3,5,5-trimethylcyclohexanone (isophoronenitrile, IPN), NHand H, the hydrogenation is carried out at from 50 to 200° C. and a pressure of from 50 to 300 bar in the presence of a hydrogenation catalyst having an alkali metal content of ≦0.03% by weight, calculated as alkali metal oxide referring to the total weight of the catalyst. The alkali metal content is made up of the contents of Li, Na, K, Rb and Cs; in particular, the alkali metal content is the Na content. A process for producing hydrogenation catalysts having an alkali metal content (in particular a sodium content) of ≦0.03% by weight, calculated as alkali metal oxide/sodium oxide referring to the total weight of the catalyst, and the hydrogenation catalysts themselves are also provided by the invention.