Catalytic conversion method for preparing propylene and high-octane gasoline

Abstract

A catalytic conversion method for preparing propylene and high-octane gasoline comprises the following steps: raw materials which are difficult to be cracked are firstly contacted with a thermal regeneration catalytic cracking catalyst to carry out cracking reaction under the conditions that the reaction temperature is 600-750 DEG C and the weight hourly space velocity is 100-800h<-1>, the reactant flow is mixed with raw oil which is easy to be cracked to carry out the cracking reaction under the conditions that the reaction temperature is 450-620 DEG C and the weight hourly space velocity is 0.1-100h<-1>; the spent catalyst and reaction oil and gas are separated, the spent catalyst returns to a reactor after regeneration, the reaction oil and gas are separated to obtain propylene and gasoline, and hydrogenated heavy oil obtained by hydrotreating fractions above 260 DEG C is taken as raw oil of the catalytic cracking device or a conventional catalytic cracking device. The method improves the yield and the selectivity of the propylene, increases the yield of the high-octane gasoline, reduces the yield of dry gas, greatly increases the yield of liquid and realizes the high-efficient utilization of petroleum resources.

Description

technical field [0001] The present invention belongs to the catalytic conversion method of hydrocarbon oil, more specifically, it is the catalytic conversion of converting heavy raw materials into light olefins, especially propylene and high-octane gasoline by the combination of catalytic cracking and hydrotreating process of hydrocarbon oil method. Background technique [0002] Low-carbon olefins such as ethylene and propylene are important organic chemical raw materials, among which propylene is a synthetic monomer for products such as polypropylene and acrylonitrile. With the rapid growth of demand for derivatives such as polypropylene, the demand for propylene is also increasing year by year. The demand in the world propylene market has increased from 15.2 million tons 20 years ago to 51.2 million tons in 2000, with an average annual growth rate of 6.3%. It is estimated that the demand for propylene will reach 86 million tons by 2010, with an average annual growth rate...

AI Technical Summary

Problems solved by technology

[0011] The above-mentioned prior art still has deficiencies in the design of the cracking reaction of alkane molecules in the feedstock oil, and the cracking reaction of other hydrocarbon molecules in the feedstock is excessive, resulting in a substantial increase in the yield of dry gas and coke. The alkane number and gasoline potential content in diesel oil are not fully utilized, resulting in low propylene yield, while there is room for improvement in gasoline yield and quality

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