A kind of catalytic conversion method for producing propylene

Abstract

A catalytic conversion method for production of propylene, a petroleum hydrocarbon raw material and methanol are respectively contacted with a catalytic cracking catalyst in a petroleum hydrocarbon catalytic cracking reaction zone and a micropore modified catalytic cracking catalyst in a methanol catalytic conversion reaction zone to react, and separation is then carried out to obtain a propylene-rich product. a coked catalyst undergoes steam stripping and regeneration and then is divided into two parts: one part is directly sent into the catalytic cracking reaction zone to be recycled; and the other part is firstly sent into a catalyst micropore modification zone to be contacted with and react with a modifier, and then the other part is sent into the methanol catalytic conversion reaction zone to be recycled. By micropore modification of a catalyst, the catalytic cracking catalyst containing double active components macroporous zeolite and mesoporous zeolite has high heavy oil conversion ability and high propylene selectivity for catalytic cracking of a petroleum hydrocarbon raw material and also has high propylene selectivity for methanol catalytic conversion.

Description

technical field [0001] The invention relates to a catalytic conversion method, more specifically, the invention relates to a method for catalytic conversion of petroleum hydrocarbons and methanol in a composite reactor to obtain high propylene yield. 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. The propylene / ethylene ratio of light petroleum hydrocarbons such as oil or light diesel oil cannot meet the market demand, and the shortage of light feedstock oil is becoming more and more serious. Therefore, it has become important to develop the technical route of directly producing light olefins from heavy oil as raw material. the trend of. [0003] Methanol to olefins and methanol to propylene refer to the ...

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Problems solved by technology

[0009] Although the method of 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 units and the resulting catalytic cracking Gasoline is then catalytically converted 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

The ZSM-5 zeolite catalyst used in the production of propylene with methanol as a raw material is different from the dual-active component or multi-active component catalyst containing Y-type zeolite and ZSM-5 zeolite used in the production of propylene by catalytic cracking of heavy oil; Multi-active component catalyst, which will reduce the selectivity of methanol catalytic conversion reaction to propylene

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