P-diethylbenzene preparation method through ethylbenzene disproportionation

The invention relates to a p-diethylbenzene preparation method through ethylbenzene disproportionation and mainly solves the problems that in the reaction in which the p-diethylbenzene is prepared through ethylbenzene disproportionation, the p-diethylbenzene selectivity is low and the yield is low in the prior art. The method provided by the invention takes ethylbenzene as raw materials, and a gas inertial to reaction as a carrier gas, under the conditions that the reaction temperature is 300-500 DEG C, the reaction pressure is 0-1MPa, the space velocity is 1-10 hour and the molar ratio of the carrier gas to the ethylbenzene is (1:1)-(5:1), the reaction raw materials are in contact with a catalyst to generate the p-diethylbenzene and benzene. The catalyst comprises the following component in part by weight: a) 5-95 parts of silicone modified core-shell zeolite, b) 5-95 parts of a binding agent, wherein the core-shell zeolite has a core phase of ZSM-5 and a shell layer of Silicalite-1, with a silicon dioxide layer covering outside the shell layer, the problem is solved. Therefore, the method can be used for the industrial production where the p-diethylbenzene is prepared through ethylbenzene disproportionation.