Hydrocarbon catalytic conversion method for producing low carbon olefin and light aromatic hydrocarbon

Abstract

A hydrocarbon catalytic conversion method for producing low carbon olefin and light aromatic hydrocarbon comprises the following steps: allowing a petroleum hydrocarbon raw material to contact with a catalytic cracking catalyst for reaction in a riser reactor, delivering reaction effluent into a fluidized bed without separation, performing oligomerization, cracking and aromatization reactions with an introduced catalyst treated by micropore modification, separating to obtain a product rich in low carbon olefin and light aromatic hydrocarbon, performing steam stripping and regeneration of the carbon deposited catalyst, dividing the carbon deposited catalyst into two parts, delivering one part to the riser reactor for recycle, delivering the other part to a catalyst micropore modification zone, contacting and reacting with a modifier, and then delivering to the fluidized bed for recycle. The method not only has high heavy oil conversion capability and high propylene selectivity for catalytic cracking of heavy hydrocarbon raw materials, but also has very good oligomerization, cracking and aromatization performance for C4-C8 olefin, and thus the purpose of increasing low carbon olefin and light aromatic hydrocarbon yield is reached.

Description

technical field [0001] The invention relates to a method for catalytic conversion of hydrocarbons, more specifically, the invention relates to a method for catalytically cracking hydrocarbon feed oil in a combined reactor to obtain light olefins and light aromatics with higher yields. Background technique [0002] Low-carbon olefins represented by ethylene and propylene are the most basic chemical raw materials. The traditional method of producing low-carbon olefins from petroleum hydrocarbons is steam thermal cracking. The suitable raw materials are ethane, propane, butane, natural gas, and naphtha. For light petroleum hydrocarbons such as oil or light diesel oil, the propylene / ethylene ratio cannot meet the market demand. While catalytic cracking of heavy oil produces gasoline and diesel oil, a certain amount of propylene is also by-produced, but its yield only accounts for less than 12% of the raw oil. [0003] Light aromatics (benzene, toluene and xylene, referred to as...

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Problems solved by technology

[0013] Although increasing the catalytic conversion of FCC gasoline in the second reaction zone in the above method can increase the yield of propylene, some technologies sacrifice the propylene selectivity of FCC gasoline conversion, and some technologies rely on heavy oil catalytic cracking unit and generated FCC gasoline to regenerate Catalytic conversion is carried out in another independent device, and the catalysts and regeneration devices of the two devices are different to achieve the purpose of increasing propylene production, which makes the process complicated

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