METHOD FOR PRODUCING POROUS CERAMIC CATALYTIC CONVERTER AND METHOD FOR PRODUCTION OF α-METHYLSTYRENE WITH ITS USE Russian patent published in 2021 - IPC B01D71/02 C07C5/333 B01J21/04 B01J23/04 B01J23/30 B01J23/36 B01J37/25 C07C15/46 B01J23/10 

FIELD: chemistry.

SUBSTANCE: invention relates to the production of highly demanded monomers for the production of synthetic rubbers and, more specifically, to a method for production of α-methylstyrene by dehydrogenation of cumene. A method for producing a porous ceramic catalytic converter by self-propagating high-temperature synthesis from an aluminum-containing charge containing, weight percentage: α-Al₂O₃ 85-95; MgO 1-5; SiC 5-9, with the formation of a porous ceramic tube, in which an additional intermediate layer of γ-Al₂O₃ is formed on the surface of the tube by the sol-gel method, after which the catalytically active components are applied, successively impregnating the surface of the tube with aqueous solutions of potassium carbonate and cerium nitrate, and then separately applying water-alcohol solutions of the NBu₄ReO₄ and (NH₄)₆W₁₂O₃₉∙H₂O complexes, and calcining the tube in the air current stepwise increasing the temperature to obtain a catalytic converter for the dehydrogenation of ethylbenzene to α-methylstyrene. A method is also proposed for the production of α- methylstyrene by dehydrogenation of cumene in the presence of the resulting catalytic converter by mixing cumene vapors with water vapor in a ratio of 1:12-16, and its dehydrogenation is carried out at a temperature of 575-625°C and a volumetric feed rate of 1.2-1.6 h^-1.

EFFECT: increased productivity of obtaining α-methylstyrene in the process of dehydrogenation of cumene per unit of time per gram of catalyst up to 7.4 g/h*g_act.comp, which is ~ 25 times greater than in traditional industrial reactors, with lower costs for the volume of water supplied and the loading of the catalyst used, a decrease in the degree of carburization of the converter in 6 hours of operation of no more than 5 in weight percentage.

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