Application of nano molecular sieve catalyst in alkylation reaction of arene

Abstract

The invention provides an application of nanometer molecular screen in aromatic hydrocarbons alkylation reaction, and a method for generating mono-substituted, disubstituted and polysubstituted benzene by alkylation reaction of aromatic hydrocarbons with olefin hydrocarbon or alcohol on molecular sieve catalyst, wherein aromatic hydrocarbons is benzene, toluol, ethylbenzene or cumene; olefin hydrocarbon is ethylene, propone, butene or isobutene; alcohol is C1 to C4 aliphatic alcohol; molecular screen is high high crystallinity sheet MCM-22, MCM-49 or MCM-56 crystal powder in which the thickness is smaller than 50nm, and sizes is between 300 and 500nm.The nanometer molecular sieve catalyst provided in present invention has high conversion rate of alkylation reaction and high selectivity, and it has fine stability, which is capable of being used for manufacturing production.

Description

technical field [0001] The invention relates to the application of nanometer molecular sieves in the alkylation reaction of aromatic hydrocarbons, and the reaction process of alkylating aromatic hydrocarbons with olefins or alcohols on nanometer molecular sieve catalysts to generate monosubstituted or disubstituted or multisubstituted benzenes. Background technique [0002] Mono-substituted, di-substituted and multi-substituted benzene compounds are important organic chemical raw materials, widely used in synthetic resins, dyes, preservatives, medicine, organic synthesis and other fields, such as toluene, ethylbenzene, cumene, tert-butyl Benzene, m / p-methylcumene, p-diethylbenzene, m / p-dicumene, 3,5-dimethylcumene, etc. [0003] Alkylation of aromatics with olefins or alcohols is a common method for the preparation of substituted benzenes, and commonly used catalysts include fluorides, liquid aluminum trichloride complexes and molecular sieves. US 4547604 has reported the a...

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Problems solved by technology

US 4547604 has reported the alkylation reaction of Lewis acids such as boron trifluoride, phosphorus pentafluoride, arsenic pentafluoride, antimony pentafluoride, tantalum pentafluoride, niobium pentafluoride as catalysts, but the catalyst used is toxic and corrosive Strong, complex separation of products

JP 8-325175, JP 2004-160354, US 4347393 and US 4049740 have reported the method for preparing m-dicumyl by alkylation of benzene and propylene on liquid aluminum trichloride complex, and the preparation of complex catalyst used in this process is complicated , the reaction requires multiple reactors connected in series, and the use of aluminum trichloride is likely to cause environmental pollution and equipment corrosion

The application of molecular sieves in the alkylation reaction is a focus of attention of researchers, and there are many patent reports: such as JP 2002-20325 (mordenite), US 3251897 (X and Y zeolites), US 3751504 (ZSM-5), JP 2000 -309546, JP 03-181424 and US 4891458 (metal ion exchanged ZSM-5, β, X, Y, mordenite), EP 402202 (Y and mordenite), US20050075522, US 4822943, US 4291185 and US 7102043 (ZSM -12), US 5233112 (ZSM-23), US 5324877 (β, L, ω, Y, X, mordenite), US 5240889, and EP 521554 (X and Y zeolites), US 5036033 (Y zeolites), US 5004840, US 4393262, CN 1704166A and CN 1721379A (silica-alumina zeolite), US 6933419 (mordenite, β, Y, MCM-68), US 20050250971 (TEA-mordenite), US 20040097771, US 2006301250731, US201 , US 6753453, US 6518471, US 5258565, US 5371310, US 149894, US 4992606 and US 5453554 (MCM-22, PSH-3, SSZ-25, MCM-36, MCM-49, MCM-56, ITQ-1, ITQ-2), etc., but mainly focus on the research of catalyst activity, less research on catalyst stability, especially less research on the stability of the synthesis of disubstituted benzene, and the catalyst used in the reaction is a conventional large grain Molecular sieves, aromatics / olefins ratio are generally high (greater than 4) and reaction stability is poor

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