Catalytic cracking aid, preparation method and application thereof, and hydrocarbon oil catalytic cracking method

Abstract

The invention relates to the field of hydrocarbon oil catalytic conversion, and discloses a catalytic cracking aid, a preparation method and application thereof, and a hydrocarbon oil catalytic cracking method. The catalytic cracking aid comprises high-silicon zeolite, mesoporous silica, an adhesive and a modifier; wherein the high-silicon zeolite is hydrogen type zeolite with an MFI skeleton structure, and the molar ratio of silicon to aluminum (SiO2 / Al2O3) is not less than 100; the mesoporous silica is a one-dimensional straight-through pore channel mesoporous silica material; the modifier is selected from at least one of alkaline earth metal oxide, rare earth metal oxide and nonmetal oxide. The catalytic cracking aid is used in the catalytic cracking process of hydrocarbon oil, and canimprove the concentration of propylene in liquefied gas and further improve the octane number of catalytically cracked gasoline under the condition of ensuring the yield of catalytically cracked liquefied gas.

Description

technical field [0001] The invention relates to the field of catalytic conversion of hydrocarbon oil, in particular to a catalytic cracking additive, a preparation method and application thereof, and a method for catalytic cracking of hydrocarbon oil. Background technique [0002] Propylene is an important chemical basic raw material next to ethylene, mainly used in the production of polypropylene, acrylonitrile, propylene oxide, acrylic acid, cumene and other chemicals. my country's propylene industry still maintains a medium-speed growth. It is estimated that by 2020, propylene production capacity, production, imports, apparent consumption and equivalent demand will reach about 39.5 million tons / year, 33.5 million tons, 1.2 million tons, 34.7 million tons and 37 million tons respectively. Equivalent demand and production There is still a gap of 3.5 million tons. From the perspective of the supply and demand of propylene in my country, on the one hand, there is a shortage...

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Problems solved by technology

Such as the catalytic cracking catalysts or additives provided by the above-mentioned patent documents, because they only pay attention to the modification of conventional ZSM-5 molecular sieves, they do not pay attention to the role of the carrier, and ignore the secondary conversion of cracked products in the cracking reaction process. Although they can effectively Increase the yield of low-carbon olefins and increase the octane number of catalytic cracking gasoline, but the selectivity for propylene is not high in the catalytic cracking reaction process, and the increase of propylene concentration in liquefied gas is limited

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