Method for producing low carbon olefin by catalytic conversion of lightweight petroleum hydrocarbon

Abstract

The invention relates to a method for method for producing low carbon olefin by catalytic conversion of lightweight petroleum hydrocarbon, which is characterized in that a lightweight hydrocarbon oil raw material is introduced at the bottom of a riser reactor, and is connected to a regenerated catalyst for a catalytic cracking reaction and simultaneously flows upwardly, the reaction oil gas at an outlet of the riser reactor and a catalyst to be generated enable gas-solid separation after being introduced in a cyclone separator, the separated reaction oil gas is further separated to obtain ethane, propylene, C2-C3 alkane and C4 hydrocarbon fraction and other products; the separated catalyst to be generated is stripped, scorched and regenerated for cycle usage; the riser reactor is arranged in a catalyst reactivator, the outlet of the riser reactor is communicated with the cyclone separator, a gas phase outlet of the cyclone separator is communicated with a subsequent separating system through a collection chamber, and a solid phase outlet of the cyclone separator is communicated with the inner part of the catalyst reactivator through a stripping stage. A settler is arranged at the upper part of the stripping stage. According to the invention, the riser reactor is placed in the catalyst reactivator, the energy is saved, and the thermal balance problem due to insufficient scorching of the lightweight hydrocarbon oil can be simultaneously reduced.

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

[0006] 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] 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 that of conventional catalytic cracking or other catalytic conversion methods, and the coke generated by its own cracking often cannot meet the needs of the reaction-regeneration system. own heat balance needs

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

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