Method for the production of isophorondiamine (ipda,3-aminomethyl-3,5,5-trimethylcyclohexylamine)

US7060857B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Frank Funke · Bischofswerda, DE
• Thomas Hill · Ludwigshafen, DE
• Johann-Peter Melder · Schifferstadt, DE
• Ekkehard Schwab · Neustadt, DE
• Walter Himmel
• Erhard Henkes · Lorsch, DE
• Hermann Petersen · Burghausen, DE
• Reinhard Korner · Bischofswerda, DE

Key dates

• Filing date: Aug 28, 2002
• Grant date: Jun 13, 2006
• Expiry date: Dec 8, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2601/14
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

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), NH3 and H2, 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.