The reaction of allyl bromide with phenol, in the presence of quaternary methyl ammonium membrane in a 1,2-dichloroethanelaqueous solution in a membrane reactor, was investigated. The reaction mechanism of this system was described by combining the experimental data and Langmuir-Hinshelwood theory. Theoretical models and calculations were performed to predict the kinetic behavior of the reaction system. Experimental results confirmed the developed model. The parameters of selectivity coefficient, adsorbing rate constant, and activation energy were obtained. (C) 2005 American Institute of Chemical Engineers.