ABSTRACT
A kinetic study of hydroxyacetophenones formation from acylation of phenol with acetic acid was carried out on a HZSM5 zeolite (Si/Al = 42). Only ortho-and para- isomers are formed. The reaction orders with respect to phenol was close to zero and was negative with respect to acetic acid. Curiously, the rate of formation of the ortho- isomer passes through a maximum at about 550 K; that of the para- isomer increases with the reaction temperature. The optimal conditions for a selective production of ortho-hydroxyacetophenone are specified.
