Catalyst for preparing ethylbenzene by reacting ethylene with benzene, and preparation method and application of catalyst

Abstract

The invention discloses a catalyst for preparing ethylbenzene by reacting ethylene with benzene. The catalyst comprises a modified ZSM-5 molecular sieve, a modified ultrastable Y-type molecular sieve and an inorganic oxide, wherein the modified ZSM-5 molecular sieve consists of a ZSM-5 molecular sieve and 0.1wt%-10wt% of rare earth metal oxide which is supported on the ZSM-5 molecular sieve; a mole ratio of SiO2 to Al2O3 in the ZSM-5 molecular sieve is 30-500; the modified ultrastable Y-type molecular sieve consists of an ultrastable Y-type molecular sieve, 0.1wt%-6wt% of alkaline earth metal oxide and 0.1wt%-10wt% of rare earth metal oxide; a mole ratio of SiO2 to Al2O3 in the ultrastable Y-type molecular sieve is 4-15; the alkaline earth metal oxide and the rare earth metal oxide are supported on the ultrastable Y-type molecular sieve; the inorganic oxide is one or a mixture of more than two of aluminium oxide, zinc oxide and silicon oxide; a weight ratio of the modified ZSM-5 molecular sieve to the modified ultrastable Y-type molecular sieve and the inorganic oxide is (35%-85%):(5%-40%):(10%-55%).

Description

technical field [0001] The present invention relates to a catalyst for the reaction of ethylene and benzene to produce ethylbenzene, its preparation method and application, in particular to a catalyst for catalyzing the reaction of ethylene and benzene in dry gas to prepare ethylbenzene, and also to the preparation method of the catalyst, and to The purposes of above-mentioned catalyst. Background technique [0002] Alkyl aromatics are widely used intermediate products, the most important of which are ethylbenzene and cumene. Ethylbenzene is the key raw material for the production of styrene, and styrene is an important monomer for the synthesis of polymer materials, mainly used for the production of Taking polystyrene and copolymer ABS resin, AS resin, styrene-butadiene rubber, and unsaturated polyester, etc., in the past ten years, the production capacity of ethylbenzene in the world has more than doubled, with a total output of 24 million tons per year. In recent years, my...

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Problems solved by technology

[0019] Subsequent studies have shown that unmodified ZSM-5 molecular sieve has a significant disadvantage as a catalyst for the synthesis of ethylbenzene: poor catalyst selectivity and activity stability, and fast deactivation rate

[0021] (1) The raw material ethylene is limited to pure ethylene, which is not suitable for the reaction of preparing ethylbenzene with catalytic cracking or dry gas of catalytic cracking (collectively referred to as catalytic dry gas) as raw material, or suitable for the reaction of catalytic dry gas as raw material, but it is required to It is pre-refined, resulting in a significant increase in production costs;

[0022] (2) Some require the reaction to be a gas phase reaction, which is easy to cause gas escape. Moreover, the reaction temperature of the gas phase reaction is required to be high, which is more likely to cause gas escape, pollute the environment, and cause harm to the surrounding people at the same time, and the high reaction temperature will lead to catalyst increased inactivation;

[0023] (3) Some reactions can be liquid-phase reactions, but the reaction pressure is too high (such as 1.2-3.5MPa in CN100389876C), and there are potential safety hazards if the pressure is too high, and the requirements for equipment are high, which increases equipment investment;

[0024] (4) The activity and selectivity stability of the catalyst is poor, which cannot meet the industrial demand for high stability of the catalyst, and is not conducive to the long-term operation of the production device

[0025] This shows that above-mentioned existing benzene and ethylene reaction prepare the catalyst of ethylbenzene in product composition and structure, preparation method and use, obviously still have inconvenience and defect, and urgently need to be further improved

In order to solve the above-mentioned problems, the relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and there is no suitable structure and method for general products and methods to solve the above-mentioned problems. This is obviously a problem that relevant industry players are eager to solve

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