Method for producing 1,2-diamino-3-methylcyclohexane and/or 1,2-diamino-4-methylcyclohexane

US8134028B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Friederike Osswald · Mannheim, DE
• Karl Heinz Brauch · Lampertheim, DE
• Arnd Bottcher · Bischofswerda, DE
• Jochem Henkelmann · Mannheim, DE
• Frederik van Laar · Dubai, AE
• Till Gerlach · Ludwigshafen, DE

Key dates

• Filing date: Dec 14, 2005
• Grant date: Mar 13, 2012
• Expiry date: May 21, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2601/14
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

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.