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:
Mar. 13, 2012
Filed:
Dec. 14, 2005
Friederike Osswald, Mannheim, DE;
Karl Heinz Brauch, Lampertheim, DE;
Arnd Bottcher, Kuantan, MY;
Jochem Henkelmann, Mannheim, DE;
Frederik Van Laar, Limburgerhof, DE;
Till Gerlach, Ludwigshafen, DE;
Friederike Osswald, Mannheim, DE;
Karl Heinz Brauch, Lampertheim, DE;
Arnd Bottcher, Kuantan, MY;
Jochem Henkelmann, Mannheim, DE;
Frederik van Laar, Limburgerhof, DE;
Till Gerlach, Ludwigshafen, DE;
BASF SE, Ludwigshafen, DE;
Abstract
A process for preparing 1,2-diamino-3-methylcyclohexane and/or 1,2-diamino-4-methylcyclohexane by reacting 2,3- and/or 3,4-diaminotoluene with hydrogen at elevated pressure and elevated temperature in the presence of a heterogeneous rhodium catalyst, wherein a mixture comprising 2,3- and/or 3,4-diaminotoluene, a dialkyl ether and/or alicyclic ether as a solvent and ammonia is initially charged in an autoclave in the presence of the catalyst and subsequently hydrogenated while supplying hydrogen.