ZSM-5 molecular sieve catalyst for catalytic preparation of xylene from coked benzene and methanol and use thereof

However, in these two patents, the former only proposes a process method, but does not discuss in detail the key technology catalyst, and its product is mainly toluene, the economic benefit is relatively low, and the industrial production use...

The present invention is by the research to Bronsted acid center catalyzed method principle, has selected suitable acidic molecular sieve catalytic material in laboratory synthesis, and adopts basic metal oxide as modifier to carry out molecular sieve modification process, substantially eliminated The strong acid sites on the surface of molecular sieves have obtained the above-mentioned SM-5 molecular sieve catalysts that can catalyze the alkylation of methanol coking benzene to produce xylene, and developed a new reaction process that uses the above catalysts to catalyze the alkylation reaction of coking benzene and methanol to produce xylene. The research results show that: under the conditions of using CO2 as the reaction medium, the reaction temperature is 420°C, the molar ratio of benzene/toluene/methanol is 1.05/0.95/2, the pressure is 1.0MPa, and the reaction space velocity WHSV2.0h-1, the two The product selectivity of toluene is above 80%, the single-pass reaction conversion rate of benzene is about 40%, and the single-pass conversion rate of methanol reaches 100%. The toluene forme...