Method and device for preparing low-carbon olefin from petroleum hydrocarbon

Abstract

The invention relates to the field of preparation of low-carbon olefins from petroleum hydrocarbons, and discloses a method and a device for preparing low-carbon olefins from petroleum hydrocarbons. The method comprises: carrying out first hydrotreatment on crude oil to obtain refined crude oil, and mixing the refined crude oil and liquid-state hydrocarbon to form a first mixture; gasifying the first mixture under a reduced pressure condition to obtain a gasified first mixture, and carrying out primary cyclone separation on the gasified first mixture to obtain a first steam phase and a first liquid phase; carrying out secondary hydrogenation treatment on the first liquid phase to obtain a refined first liquid phase, mixing the refined first liquid phase and liquid-state hydrocarbon to forma second mixture, gasifying the second mixture, and carrying out secondary cyclone separation to obtain a second steam phase; and combining the first steam phase and the second steam phase, crackingto obtain cracked gas, and separating the cracked gas to obtain low-carbon olefin. According to the method, the cracking efficiency of crude oil can be improved, the coking phenomenon during crackingis reduced, the operation period is prolonged, and the yield of low-carbon olefins in the product is increased.

Description

technical field [0001] The invention relates to the field of preparing low-carbon olefins from petroleum hydrocarbons, in particular to a method and device for preparing low-carbon olefins by vacuum cracking of petroleum hydrocarbons. Background technique [0002] Low-carbon olefins usually refer to the general term of unsaturated hydrocarbons with carbon four or less, mainly including ethylene, propylene, isobutylene, butadiene and other organic chemical raw materials with high economic value. With the development of my country's economy, the demand for these organic chemical raw materials is increasing year by year. Although the production scale of low-carbon olefins is also increasing year by year, it cannot meet the growing demand. [0003] For a long time, my country has been preparing low-carbon olefin products from naphtha. However, in recent years, with the massive exploitation of associated gas in oilfields in the Middle East and shale gas in the United States, the...

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Problems solved by technology

[0010] The purpose of the present invention is to provide a method and device for preparing low-carbon olefins from petroleum hydrocarbons in order to overcome the problems of insufficient crude oil gasification, easy coking in the cracking process, and low yield of low-carbon olefins in the prior art. The method can improve the cracking efficiency of crude oil, reduce its coking phenomenon during cracking, prolong the operation period, and simultaneously increase the yield of low-carbon olefins in the product

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