Process for influencing the cis-/trans-relation of 3-aminomethyl-3,5,5-trimethylcyclohexylamine in its preparation from 3-cyano-3,5,5-trimethylcyclohexanone

3-Aminomethyl-3,5,5-trimethylcyclohexylamine (isophoronediamine) is a raw material which is used industrially for various synthetic resins. Isophoronediamine is used as a cis/trans isomer mixture, the cis/trans isomer ratio influencing the properties. The invention shows a way of controlling the iso...

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Hauptverfasser:	ARNTZ, DIETRICH DR, MOST, DIETER DR, HAAS, THOMAS DR
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS APPARATUS THEREFOR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY GENERAL METHODS OF ORGANIC CHEMISTRY METALLURGY ORGANIC CHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	3-Aminomethyl-3,5,5-trimethylcyclohexylamine (isophoronediamine) is a raw material which is used industrially for various synthetic resins. Isophoronediamine is used as a cis/trans isomer mixture, the cis/trans isomer ratio influencing the properties. The invention shows a way of controlling the isomer ratio in the preparation of isophoronediamine by aminating hydrogenation of 3-cyano-3,5,5-trimethylcyclohexanone (isophoronenitrile) in the presence of ammonia, H2 and a catalyst. The reaction is carried out in two temperature stages, namely first at 10 to 90 DEG C and then at 90 to 150 DEG C with a temperature difference between both stages of at least 30 DEG C, the contact time in the first stage being shorter than in the second. By lowering the temperature in the first stage the cis/trans ratio is increased.