Catalytic conversion method of light hydrocarbon oil with heat exchange

Abstract

The invention relates to a lightweight hydrocarbon oil catalytic conversion method with heat exchange, which comprises the following steps: a raw material and oil gas through high temperature reaction enable heat exchange, the raw material is introduced to the bottom of a riser reactor, and enables contact reaction with a regenerated catalyst, the reaction oil gas at an outlet of the riser reactor and a catalyst to be generated enable gas-solid separation through a cyclone separator, the high temperature reaction oil gas is introduced in a quench tower and enables heat exchange with the raw material and then cooled, a process of separating is carried out to obtain the products such as ethane, propylene, C2-C3 alkane and C4 hydrocarbon fraction; the separated catalyst to be generated is stripped 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 the quench tower, and a solid phase outlet of the cyclone separator is communicated with the inner part of the catalyst reactivator through a stripping stage. According to the invention, the riser reactor is placed in the catalyst reactivator, the total superficial area of heat radiation is reduced, the fuel supplement amount is reduced, and the energy is saved.

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, the weight space velocity is 0.5-3h-1, the water / naphtha weight Under the condition of ratio 0~5:1, the mixed gas of raw material is contacted and reacted 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 molecular sieve or ZSM-5 / Y The technical solution of at least one of the zeolite symbiotic molecular sieves mainly solves the problems of short life of the catalyst due to coking and the consumption of a large amount of water vapor 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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