ALKYLATION OF O-XYLENE BY TERT-BUTANOL ON ZEOLITE AND ZEOLITE-CONTAINING CATALYSTS

For the alkylation of o-xylene by tert-butanol, new data have been obt ained concerning the possibilities of controlling the selectivity and stability of zeolite catalysts, among other means by controlling their acidic properties and hydrophoby. A study has been made of features o f the action of crystalline aluminosilicates of different types and co mpositions (X, Y, including dealuminized Y', mordenite, pentasil), amo rphous aluminosilicate and zeolite-containing catalyst Tseokar-2 in th e conversion of C6H4(CH3)2 + C4H9OH mixtures. A catalyst ensuring the production of 1,2-dimethyl-4-tert-butylbenzene (DMTBB) with a yield of up to 94% of the theoretical figure with a selectivity of alcohol con version to target product of 94-97% has been developed. It can be used as the basis of a high-performance and ecologically clean method for synthesizing DMTBB - the initial substance for the production of a num ber of new, technically valuable products.