A kind of method and system for heavy oil production of light olefins and light aromatics

Abstract

The invention relates to a method and system for producing more light olefins and light aromatics from heavy oil, the method comprising: introducing heavy oil feedstock into a first riser reactor to contact with a first catalytic cracking catalyst and performing a first catalytic cracking reaction; The oil agent obtained in the first riser reactor is introduced into the fluidized bed reactor for the second catalytic cracking reaction to obtain the first reaction product and the first spent catalyst; the first reaction product and the first spent catalyst are subjected to the first Separation of oil agent, the obtained reaction product is separated into middle distillate oil; the obtained middle distillate oil is contacted with a hydrotreating catalyst and subjected to hydrotreating to obtain a hydrogenated distillate oil; the obtained hydrogenated distillate oil is introduced into the second riser reactor Contact with the second catalytic cracking catalyst and perform the third catalytic cracking reaction to obtain the second reaction product and the second spent catalyst. The method and system of the present invention can produce more light olefins and light aromatics.

Description

technical field [0001] The invention relates to a method and system for producing more light olefins and light aromatics from heavy oil. 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 determine...

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Problems solved by technology

[0003] At present, naphtha steam cracking and other processes are mainly used in my country for production. Steam cracking consumes a lot of energy, and because the raw materials in our country are generally heavy, the yield of naphtha fractions with a boiling point below 200°C is low, and only less than 50% of steam cracking can be provided. Feedstock for the production of light olefins

[0011] From the technologies disclosed in the above patent applications, it can be seen that the development of existing technologies for the catalytic conversion of hydrocarbons to produce light olefins is mainly focused on heavy oil catalytic cracking technology, and has not maximized the production of light olefins. In order to increase the demand for low-carbon olefins, it is necessary to develop a catalytic conversion method that uses conventional heavy oil as a raw material and converts it into chemical raw materials such as light olefins and light aromatics to the maximum extent through product hydroprocessing and back refining, so as to improve process selectivity , Efficient use of oil resources

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