PARA-SELECTIVE ALKYLATION OF AROMATIC HYDROCARBONS

摘要

A process for the selective alkylation of monoalkylbenzene into dialkylbenzenes wherein the para isomer of the disubstituted product is present in a concentration greater than in a thermodynamic equilibrium is provided. The method comprises passing the monoalkylbenzene and an alkylating agent capable of methylation, ethylation or propylation through a reaction zone containing an unmodified crystalline silica catalyst of the silicalite type having the monoclinic symmetry.