Method and system for preparing low-carbon olefin from crude oil

Abstract

The invention relates to the field of preparation of low-carbon olefins, and discloses a method and a system for preparing low-carbon olefins from crude oil. The method comprises the following steps: (1) mixing crude oil with light hydrocarbon, and extracting under the condition of high pressure greater than 1MPa to obtain light components and heavy components; (2) mixing the light component with water vapor, feeding into a convection section of a cracking furnace, heating to a crossing temperature, feeding into a radiation section of the cracking furnace, and cracking to obtain a cracking product; (3) performing catalytic thermal cracking on the heavy component to obtain catalytic thermal cracking gas; and (4) mixing the cracking product in the step (2) with the catalytic pyrolysis gas, and separating to obtain a product containing low-carbon olefin. The method provided by the invention is simple in process flow, the cracking efficiency of the crude oil raw material can be improved, the operation cycle can be prolonged, the coking phenomenon during cracking of the crude oil raw material can be reduced, meanwhile, the yield of low-carbon olefins in the product can be improved, and the method has a wide application prospect.

Description

technical field [0001] The invention relates to the field of preparation of low-carbon olefins, in particular to a method and system for preparing low-carbon olefins from crude oil. Background technique [0002] Low-carbon olefins usually refer to the general term of unsaturated hydrocarbons with carbon four or less, mainly including ethylene, propylene, 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, naphtha has been mostly used as the main raw material for the preparation of light olefins in my country. However, in recent years, with the massive exploitation of associated gas in oilfields in the Middle East and shale gas in the United States, these cheap oil and gas resources ...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method and system for preparing low-carbon olefins from crude oil in order to overcome the technical problems of low utilization rate of crude oil, easy coking in the process, and short operation period of equipment in the prior art, and the process flow of the method is simple , can improve the cracking efficiency of crude oil raw materials, prolong the operation cycle, reduce the coking phenomenon during cracking, and also increase the yield of low-carbon olefins in the product

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