Catalytic conversion method for production of propylene and high-octane-value gasoline by crude oil

Abstract

The invention discloses a catalytic conversion method for production of propylene and high-octane-value gasoline by crude oil, which is characterized in that: pretreated crude oil is used as raw oil and comes into contact with a catalyst, featured by rich mesopore zeolite and coarse particle diameter distribution, in a catalytic conversion reactor, reaction temperature, oil gas residence time and the weight ratio of the catalyst to the raw oil guarantee that the reaction results in a reaction product containing catalytic wax oil accounting for 12 to 60% of the raw oil by weight, wherein the weight hourly space velocity is 25 to 100h<-1>, the reaction temperature is 450 to 700 DEG C and the weight ratio of the catalyst to the raw oil is 1 to 30. The method achieves the conversion of low-quality crude oil into propylene and high-octane-value gasoline and simultaneously reduces the yield of dry gas and coke remarkably so as to realize the effective utilization of petroleum resources; and local temperature distribution is more uniform in the process of regeneration owing to more homogeneous particles of the catalyst, and the crushing tendency of the catalyst is correspondingly reduced.

Description

technical field [0001] The invention relates to a method for catalytic conversion of crude oil, in particular to a method for converting heavy crude oil into propylene and high-octane gasoline while greatly reducing dry gas and coke yields so as to realize efficient utilization of petroleum resources. Background technique [0002] Propylene and other low-carbon olefins are important organic chemical raw materials, and 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%. [0003] The methods for producing propylene are mainly steam cracking and catalytic cracking (FCC), wherein steam cracking uses naphtha and other light oils as raw materials to produce...

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Problems solved by technology

[0006] 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 under the condition of increasing the propylene yield. Utilization, resulting in low propylene yield, while there is room for improvement in gasoline yield and quality

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