METHOD OF HYDROGENATION OF UNSATURATED CYCLIC COMPOUND Russian patent published in 2003 - IPC

FIELD: organic chemistry, chemical technology. SUBSTANCE: invention relates to the improved method of hydrogenation of unsaturated cyclic compounds as, for example, benzene and aniline, or cyclohexylphenylamine and dicyclohexylamine to yield, for example, cyclohexylphenylamine or cyclohexane. Method is carried out in liquid phase in the presence of hydrogenation catalyst made as packing for distillation and having structure useful for distillation and presenting metal applied on carrier made of aluminum oxide in reactive-rectifying column. Method involves the following stages: a) feeding the first current containing cyclic or polycyclic compounds and the second current containing hydrogen; b) contact of unsaturated cyclic compounds and hydrogen at temperature 37-190 C, under partial pressure of hydrogen less 7.031 kg/cm² (less 345 kPa) but preferably less 4.922 kg/cm² and excessive pressure in upper part of rectifying column from 1.0547 kg/cm² to 8.437 kg/cm² (from 101 to 929 kPa) in the presence of the above-mentioned catalyst layer, part of unsaturated cyclic compounds react with part of hydrogen to form reaction mixture containing unsaturated cyclic compounds, unreacted hydrogen and unreacted cyclic compounds; c) pressure in reactionrectifying column (I) is maintained so to provide the presence vapor phase and some amount of liquid phase in column and continuous spraying in catalyst layer that provides the state of reaction mixture at the boiling point and (II) for condensation of vapors part in reaction system that results to condensation of part of aromatic and other unsaturated cyclic and polycyclic compounds on catalytic structure; d) removal of gaseous unsaturated compounds and hydrogen as upper distillate from reactive- -rectifying column; e) condensation of essentially all unsaturated cyclic compounds and saturated cyclic compounds removed as upper distillate from reaction-rectifying column; f) recovery of part of condensed unsaturated cyclic compounds and saturated cyclic compounds into reaction-rectifying column as phlegm; g) removal of liquid product containing saturated cyclic compounds from reactionrectifying column and removal of unreacted unsaturated cyclic compounds from condensed upper distillates. EFFECT: improved method of dehydrogenation. 20 cl, 2 dwg, 5 tbl, 5 ex