Catalytic conversion method for preparing aromatic hydrocarbons and light olefins

Abstract

The invention provides a catalysis conversion method used for preparing arene and low carbon olefin; the raw material with the distilling range of 160-260 DEG C contacts a catalytic cracking catalyst, so as to carry out the cracking reaction inside a fluidized bed reactor under the conditions of 450-750 DEG C of temperature, 0.1-800h<-1> of weight hourly space velocity, 0.10-1.0MPa of pressure, 1-150 of weight ratio of catalyst to raw material and 0.05-1.0 of weight ratio of water vapour to raw material; a spent catalyst and reaction oil gas are separated, and the spent catalyst is returned to the reactor after regeneration; the reaction oil gas is separated so as to gain the object outcome: low carbon olefin and arene. The method greatly increases the yield and selectivity of the ethane and propylene, the yield of the gasoline and the yield of the arene in the gasoline are extremely high, only little heavy oil is generated; furthermore, the yield of coke is low.

Description

technical field [0001] The present invention belongs to the catalytic conversion method of hydrocarbon oil in the absence of hydrogen, more specifically, it is a method for converting raw materials into short-chain aromatics and low-carbon olefins, especially olefins are mainly ethylene and propylene, and short-chain aromatics are mainly Catalytic conversion method based on toluene, xylene and cumene. Background technique [0002] Low-carbon olefins such as ethylene and propylene are important organic chemical raw materials, of which ethylene is only used to produce polyethylene (HDPE, LDPE, LLDPE), ethylene oxide (EO), dichloroethane / vinyl chloride monomer (EDC / VCM) and ethylbenzene (EB). Global ethylene demand increased roughly from 73 million tons in 1996 to 115 million tons in 2006. According to the analysis of the Chemical Market Association (CMAI) in Houston, USA, the annual growth rate of ethylene demand will be about 4.3% in 2006-2010; and propylene is a synthetic...

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Problems solved by technology

[0009] The above-mentioned prior art still has deficiencies in the design of the alkane molecular cracking reaction, resulting in a substantial increase in the dry gas yield when the propylene yield is increased. At the same time, the product distrib

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