A kind of light hydrocarbon oil catalytic conversion method

Abstract

The invention provides a light hydrocarbon oil catalytic conversion method. The method comprises the steps that a light hydrocarbon oil raw material enters a catalytic cracker to undergo a catalytic cracking reaction, generated reaction oil and gas are separated to obtain low carbon olefin and a spent catalyst is recycled after being regenerated, wherein the catalytic cracker comprises a regenerator (2), a riser reactor (1), a closed hood (3), a cyclone separator (5) and a regeneration standpipe (9); the closed hood (3) is arranged outside an outlet of the riser reactor and is communicated with an inlet of the cyclone separator (5) via an outlet in the top; a catalyst outlet of the cyclone separator (5) is communicated with the regenerator; the bottom of the closed hood (3) is communicated with the regenerator (2); the riser reactor (1), the closed hood (3), the cyclone separator (5) and the regeneration standpipe (9) are arranged in the regenerator (2). The method provided by the invention has the beneficial effects of reducing the total radiating surface area of a reaction regeneration system, reducing the radiation energy consumption of the reactor and solving the problem of insufficient heat caused by insufficiency of cokes generated by cracking of light petroleum hydrocarbon.

Description

technical field [0001] The invention relates to a method for catalytic conversion of hydrocarbon oil in the absence of hydrogen, in particular to a method for catalytic conversion of light hydrocarbon oil to produce light olefins. Background technique [0002] As important basic organic raw materials for petrochemical industry, ethylene and propylene play a pivotal role in the petrochemical industry. In the production technology of hydrocarbon cracking to produce ethylene and propylene, tube furnace thermal cracking method accounts for the largest share of the world's ethylene and propylene production. Dominant, more than 98% of ethylene and 67% of propylene come from tube furnace cracking technology. With the increase of demand for propylene derivatives, the yield of propylene produced by thermal cracking can no longer meet the growing demand for propylene in the domestic and foreign markets. In the past 10 years, the growth rate of world propylene demand has been higher th...

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Problems solved by technology

[0008] CN102040438A proposes a coaxial embedded riser reaction-regeneration device, which aims to solve the problem that it is difficult to achieve high-temperature reaction when using a riser reactor for cyclic reaction-regeneration in the existing light oil / light hydrocarbon catalytic cracking process, The device adopts the technical scheme that the main reaction zone of the riser reactor is located inside the regenerator, and the settler, stripper and riser reactor are located on the same axis, making full use of the heat of the regenerator

[0011] CN101134160A proposes a reaction device for the production of low-carbon olefins by catalytic cracking, using the high-temperature regeneration flue gas of the catalytic cracking device as a heat source, and using light oil products such as naphtha as raw materials to carry out catalytic cracking reactions to produce low-carbon olefins. Due to the use of tubular reactors, it is difficult to solve the problem of rapid catalyst deactivation for highly active molecular sieve catalysts

[0012] Due to the high conversion rate of the cracking reaction of the catalytic cracking process, the high reaction temperature, and the high heat of the cracking reaction, compared with conventional catalytic cracking or other catalytic conversion methods, the heat required for the reaction is more, and the coke generated by its own cracking often cannot meet the requirements of the reaction. - Requirements for heat balance of the regenerative system itself

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