Process for the preparation of a cyclohexylamine and dicyclohexylamine mixture

摘要

Method for preparing a mixture of cyclohexylamines and di-cyclohexylamines of formulae (I) and (II) is new. The method comprises catalytic hydrogenation of anilines of formula (III) at a reaction temperature of 140-260 degrees C and an H2 pressure of 10-400 bar. The catalyst comprises two reduced, carrier-less catalysts (A and B) which are made from compressed metal oxide or hydroxide powders. The element composition of each of the catalysts is as follows: Catalyst A: 40-60 wt.% Fe, Co and/or Ni; 10-20 wt.% Mn; 0.05-1.5 wt.% Cu; 0.2-5 wt.% Ca, Sr and/or Ba. Catalyst B: 30-50 wt.% Fe, Co and/or Ni; 3-10 wt.% Mn; 5-15 wt.% Si; 2-8 wt.% Mg. The weight ratios in each catalyst are made up to 100% with oxygen.