| 摘要 |
A process is disclosed for the continuous preparation of 3-aminomethyl-3,5,5-trimethylcyclohexylamine (isophoronediamine) in high yield and high purity from 3-cyano-3,5,5-trimethylcyclohexanone (isophoronenitrile) by aminating hydrogenation with hydrogen and ammonia in the presence of a fixed bed catalyst. The aminating hydrogenation is carried out by allowing a mixture of isophoronenitrile, ammonia and a C1-C3-alcohol, in the presence of hydrogen, to trickle over a trickle bed reactor provided with a Co and/or Ru fixed bed catalyst, at 3 to 8 MPa and at a temperature of 40 DEG to 150 DEG C., preferably 90 to 130 DEG C., and working up the reaction mixture by distillation. Preferably, a high-boiling by-product fraction, containing a bicyclic amidine, is added to the mixture to be hydrogenated, thereby appreciably increasing the yield.
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