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 the bottom of a riser reactor of a catalytic cracker, carries out a contact reaction with a regenerated catalyst and simultaneously flows upwards, reaction oil and gas at an outlet of the riser reactor and the catalyst are subjected to gas-solid separation and the separated reaction oil and gas are led out of the catalytic cracker and are further separated; the separated spent catalyst is recycled after being regenerated, wherein the catalytic cracker comprises a regenerator (2), the riser reactor (1) penetrating through the regenerator (2), a regeneration standpipe (9) and a cyclone separator; the outlet of the riser reactor (1) is communicated with an inlet of the cyclone separator; a catalyst outlet of the cyclone separator is communicated with the regeneration standpipe (9); the regeneration standpipe (9) is arranged inside the regenerator (2); an opening in the bottom of the regeneration standpipe (9) is formed 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] Ethylene is one of the most important basic raw materials in the petrochemical industry. Through ethylene polymerization, alkylation with benzene, and addition reaction with water, oxygen, and halogen, a series of extremely valuable derivatives can be obtained. The world ethylene industry continues to maintain a steady development trend. At present, about 98% of the world's ethylene comes from tube furnace steam cracking technology. Among the raw materials for ethylene production, naphtha accounts for 46% and ethane accounts for 34%. [0003] Propylene is one of the most important olefins, second only to ethylene in consumption. The derivative of propylene with the largest amount is polypropylene, which accounts for ...

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Problems solved by technology

[0008] CN101279881A discloses a method for catalytically cracking naphtha to produce ethylene and propylene. The invention adopts naphtha composed of C4-C10 hydrocarbons as a raw material. After the raw material hydrocarbon is vaporized, it is first mixed with an inert gas. The molar ratio of naphtha is greater than 0-5.0:1, the reaction temperature is 580-750°C, the reaction pressure (in gauge pressure) is greater than 0-0.5MPa, and the weight space velocity is 0.5-3h -1 , under the condition of water / naphtha weight ratio of 0~5:1, the mixed gas of raw material is contacted with catalyst to generate ethylene and propylene, wherein the catalyst used is selected from ZSM-5 / mordenite symbiotic molecular sieve, ZSM-5 / beta zeolite symbiotic The technical solution of at least one of molecular sieves or ZSM-5 / Y zeolite symbiotic molecular sieves mainly solves the problems of short catalyst life due to coking and large water vapor consumption in the reaction of naphtha catalytic cracking to ethylene propylene

[0009]CN102040438A discloses a riser reaction-regeneration device, which aims to solve the problem of using a riser reactor for cyclic reaction in the existing light hydrocarbon and light oil catalytic cracking process Difficult to achieve high temperature reaction during regeneration

[0011] 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, the heat required for the reaction is more than conventional catalytic cracking or other catalytic conversion methods The coke generated by its own cracking often cannot meet the needs of the reaction-regeneration system's own heat balance

The above-mentioned prior art proposes methods and catalysts for converting petroleum hydrocarbons into light olefins through a catalytic cracking reaction process, but fails to solve the problem of insufficient heat of reaction in the cracking process of light hydrocarbon oils

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