Synthesis of para-Dichlorobenzene by Chlorobenzene Chlorination on NaY Zeolite Heterogeneous Catalyst

摘要

A selective procedure for p-dichlorobenzene synthesis, yielding p-dichlorobenzene and 1,2,4-trichlorobenzene free of isomeric dichlorobenzenes, was suggested. The chlorination was performed in two steps: with feeding chlorine in an equimolar amount relative to chlorobenzene in the first step and with feeding a small (1.3-1.5-fold) excess of chlorine in the second step. NaY zeolite with the mean particle size of 3-6 mu m was used as the heterogeneous chlorination catalyst. The possibility of regeneration and multiple use of the heterogeneous catalyst was demonstrated.