Heavy oil conversion method

Abstract

The invention provides a heavy oil conversion method which comprises the following steps: under a heavy oil cracking condition, contacting heavy oil with a coke transfer agent in a reactor; performing oil-agent separation of the contact product to obtain an oil gas component and a coke transfer agent to be regenerated, wherein the method also separates light hydrocarbons in the oil gas component, and at least part of the light hydrocarbons are delivered into the reactor. The method of the invention, on one hand, has the effect of fluidization of the coke transfer agent, and on the other hand, can effectively inhibit metal inactivation and coking inactivation of the coke transfer agent, reduces the contents of dry gas and coke in the product, and improve the content of liquid components. The method of the invention can also significantly reduce treatment amounts of subsequent sewage treatment devices and water vapor generation devices, and realize the effect of energy consumption reduction.

Description

technical field [0001] The invention relates to a heavy oil conversion method. Background technique [0002] With the development of the world economy, the demand for light, clean fuel oil is also growing rapidly. However, the crude oil is becoming heavier and inferior all over the world (mainly manifested as high density, high viscosity, high carbon residue, high heavy metal content and high sulfur and nitrogen content of crude oil, etc.). These factors have presented many new challenges to the refining industry. [0003] At present, in terms of mechanism, heavy oil processing is mainly divided into two categories: decarburization and hydrogenation. [0004] Hydrogenation mainly includes hydrofining and hydrocracking. The hydrogenation process is of great significance for increasing the processing depth of crude oil, improving the quality of products, and increasing the yield of light oil products; however, the heavy oil hydrogenation process not only has high operating ...

AI Technical Summary

Problems solved by technology

[0008] In the disclosed method of CN1253368C, when petroleum hydrocarbon is contacted with coke transfer agent, need to use a large amount of water to generate water vapor, to fluidize coke transfer agent, but when using water vapor as fluidization medium, petroleum hydrocarbon and After the contact product of the coke contact agent is treated, the water vapor is converted into liquid water and separated from the reaction product. The water thus produced contains a large amount of pollutants and needs to be purified before it can enter the steam generating device again and be converted into water vapor, thus higher energy consumption

[0009] Moreover, when the carbon residue and metal content of the petroleum hydrocarbons are high, a large amount of carbonaceous substances and metals in the petroleum hydrocarbons are deposited on the coke transfer agent, resulting in a decrease in the activity of the coke transfer agent and poor selectivity. This in turn increases the content of dry gas and coke in the product

Although feeding hydrogen (e.g., from the synthesis gas generated in the regenerator) to the reactor can mitigate the coking and metal deactivation of the coke transfer agent to some extent, the resulting product is liquid The content of components still needs to be further improved

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