Catalytic cracking method and system for heavy oil feedstock

Abstract

The invention relates to a method and system for catalytic cracking of heavy oil raw materials. The method comprises: introducing heavy oil raw materials into a first catalytic cracking reactor to contact with a catalytic cracking catalyst and performing the first catalytic cracking reaction; The reaction oil agent is introduced into the second catalytic cracking reactor to carry out the second catalytic cracking reaction to obtain the unused catalyst and reaction product, regenerate the unused catalyst to obtain the regenerated catalyst as the catalytic cracking catalyst and return to the first catalytic cracking reaction In the reactor, the obtained reaction product is separated into cracked heavy gasoline; the obtained cracked heavy gasoline is contacted with a hydrotreating catalyst and subjected to hydrotreating to obtain hydrotreated oil, and the hydrotreated oil is introduced into the first catalytic cracking reactor The first catalytic cracking reaction is carried out in. The method and system of the present invention can increase the yield of light olefins.

Description

technical field [0001] The invention relates to a catalytic cracking method and system for heavy oil raw materials. Background technique [0002] Low-carbon olefins such as ethylene and propylene are important organic chemical raw materials, especially the production capacity of ethylene is often regarded as a symbol of the petrochemical development level of a country or region. According to analysis, my country's ethylene production in 2015 was 17.145 million tons, and apparent consumption was 18.6607 million tons, an average increase of about 0.6% year-on-year; my country's propylene production and consumption continued to grow. In 2016, propylene production reached 22.61 million tons, a year-on-year increase of 13.63% %; consumption was 25.87 million tons, a year-on-year increase of 19.3%, and the growth rate of consumption was about 6 percentage points higher than the growth rate of production. The relatively tight supply and demand pattern determines the annual demand f...

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Problems solved by technology

[0006] CN101191070A discloses a method for producing low-carbon olefins. In this method, the catalytic cracking catalyst is pre-extracted and reacted with raw materials in a reactor. The product obtained after the reaction and the catalyst to be produced are drawn out of the reactor for separation, and the low-carbon olefins are obtained after the separation. , gasoline, diesel, heavy oil and other low molecular saturated hydrocarbons, characterized by reduced dry gas yield

[0013] From the technologies disclosed in the above patent applications, it can be seen that the development of the existing technologies for producing low-carbon olefins from hydrocarbons mainly focuses on heavy oil catalytic cracking technology, and does not maximize the production of low-carbon olefins. In order to meet the growing demand To meet the demand for low-carbon olefins, it is necessary to develop a method that uses conventional heavy oil as raw material and converts it into low-carbon olefins and other chemical raw materials to the maximum extent through product hydrotreating and refining, so as to improve process selectivity and efficiently utilize petroleum resources.

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