Catalytic conversion method for preparing propylene and high octane gasoline

Abstract

The invention discloses a catalytic conversion method for preparing propylene and high octane gasoline. After entering different reaction regions of a first riser reactor, raw oils with different cracking performances are contacted with catalytic cracking catalyst to carry out cracking reaction so as to separate a spent catalyst and reaction oil gas, wherein the spent catalyst subject to steam stripping enters a first regenerator to be regenerated by scorching and returns to a first riser, and a product containing the propylene, the gasoline and recracking raw materials is obtained through separation of the reaction oil-gas, wherein the recracking raw materials are sent into a second riser reactor and are contacted with thermal regeneration catalyst to carry out catalytic conversion, and the spent catalyst returns to the second riser reactor after coke burning regeneration in a second regenerator. In the method, the yield of the propylene and the yield of the gasoline are obviously increased, and the gasoline octane number is obviously improved; and under the condition that the propylene yield is dramatically increased, the dry gas yield is obviously lowered by above 80 weight percent.

Description

technical field [0001] This invention pertains to the catalytic conversion of hydrocarbons in the absence of hydrogen, and more particularly to a process for the conversion of heavy feedstocks to propylene and high octane gasoline. Background technique [0002] Propylene is an important organic chemical raw material and a synthetic monomer for polypropylene, acrylonitrile and other products. 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 of about 5.6%. [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 m...

AI Technical Summary

Problems solved by technology

[0010] The above prior art still has deficiencies in the design of alkane molecular cracking reactions. At the same time, the product distribution of the prior art is cut according to the conventional FCC fractionation system, and the potential content of aromatics and low-carbon olefins in gasoline or diesel oil is not fully utilized. , resulting in low yields of propylene and aromatics

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