ALKYLATION OF BENZENE WITH DODECENE OVER HY ZEOLITE - DEACTIVATION, REGENERATION, AND PRODUCT DISTRIBUTION

The alkylation of benzene with dodecene over HY zeolite is studied in a stirred batch reactor. A special feature of the effect of the benzen e to dodecene ratio on the reaction conversion is found. Even a low wa ter content (0.04%) in the reactants greatly decreases the reaction co nversion. The catalyst is deactivated quickly because of the coke form ation in the zeolite. A special method of regenerating the deactivated catalyst has been developed. It consists of extracting the deactivate d catalyst with one of reactants, benzene. The regeneration temperatur e has a great effect on the activity of the regenerated catalyst. It i s also found that at a similar reaction conversion, there is the same product distribution for the deactivated catalyst and the regenerated catalyst. The isomer distribution in the product can be explained by t he product shape-selective mechanism.