Process for the preparation of 1,3-dimethyl-4, isopropylbenzol and 1,3-dimethyl-4,6-diisoproylbenzol

摘要

Meta-xylene is alkylated with propylene in the presence of aluminium chloride and a phenol-formaldehyde resin to form 1,3-dimethyl-4-isopropyl- and 1,3-dimethyl-4,6-diisopropylbenzenes with some 5-isopropyl and 2,5-, 4,5- and 2,4-diisopropyl isomers. For each mol. of xylene there is used 0.4-3 mol. of propene and 0.02-0.2 mol. of aluminium chloride with 40-1000% weight based on aluminium chloride of the resin which may be applied as a coating on the reactor walls. Reaction is effected at -30 DEG to 80 DEG C. for 1/4 -6 hours.