Process for preparing alkyl-substituted aromatic compounds

摘要

A process for preparing corresponding alkyl-substituted aromatic compounds by the gas phase catalytic dehydrogenation of vinylcycloalkenes in the presence of a dehydrogenation catalyst supported on a carrier, said catalytic dehydrogenation being carried out (i) in the presence of a dehydrogenation catalyst in which at least one of elements belonging to periods 5 and 6 in the group VIII of the periodic table selected from the group consisting of palladium, rhodium, platinum, iridium and ruthenium is supported on active carbon (ii) by introducing steam into the reaction system, (iii) but without introducing hydrogen into the reaction system, (iv) at conditions of temperatures ranging from 300 DEG C. to less than 350 DEG C. and pressure less than 2.5 atm (absolute pressure), wherein a liquid hourly space velocity (LHSV) is set at about 5 hr-1 or less when the catalytic dehydrogenation is effected in the presence of said catalyst in which palladium alone is supported on active carbon.