The alkylation of toluene by ethanol has been investigated. Low-concen
tration aqueous solutions of ethanol were used, modelling the product
of fermentation processing of renewable feedstock, and the catalyst wa
s a high-silica zeolite of the pentasil type. It has been shown that e
xcess water in the reaction mixture has a very favourable effect on pr
ocess selectivity with respect to ethyltoluenes, which reaches 99-100%
with the complete absence of the ortho-isomer and a para-isomer conte
nt of up to 92%.