Hydrotreatment method of heavy hydrocarbon raw material

Abstract

The invention relates to a hydrotreatment method of a heavy hydrocarbon raw material. The method adopts a fixed-bed hydrogenation reactor, which is provided with at least two catalyst bed layers inside. Between at least one adjacent catalyst bed layer, a liquid phase material is educed. The educed liquid phase material is mixed with a solvent, and then a light component is extracted. A light component-extracted heavy component is returned to the fixed-bed hydrogenation reactor so as to enter a next catalyst bed layer for continuous reaction. The extracted oil can directly enter a gasoline and diesel oil hydrogenation device so as to obtain qualified gasoline and diesel oil, or can enter a main fractionate tower of FCC (fluid catalytic cracking) for fractionation so as to obtain a crude product, which then enters a gasoline and diesel oil hydrogenation device so as to obtain qualified gasoline and diesel oil. The method of the invention not lonely can effectively reduce the pressure drop of a bed layer in subsequent hydrotreatment and prolong the service life of a catalyst, but also enhances the total conversion rate of a fixed-bed hydrogenation device simultaneously, or can improve the treatment capability of the device under a same conversion rate, as well as recovers part of light oil, thus being able to create greater benefits for enterprises.

Description

technical field [0001] The invention relates to a method for hydrogenation treatment of heavy hydrocarbon raw materials, in particular to a method for hydrogenation treatment of heavy hydrocarbon raw materials in which impurity removal and light and heavy separation are carried out simultaneously. Background technique [0002] With the deterioration and weight of crude oil and the increasing demand for light oil products, the lightening of heavy oil has become the main task of refiners. Heavy oil hydrotreating is one of the main methods for lightening heavy oil. It can not only remove a large amount of harmful impurities such as metals, sulfur, and nitrogen in residual oil, but also crack heavy and residual oil into high-value low-boiling components. . [0003] At present, there are four types of residual oil hydrogenation processes that have been industrialized or technologically mature in the world: fixed bed, moving bed, ebullated bed and suspended bed, among which the f...

AI Technical Summary

Problems solved by technology

The disadvantage of this process is that on the one hand, due to the high pressure when the heavy component is extracted, it will inevitably carry a large amount of light component and cause the loss of light oil; on the other hand, the repeated hydrogenation reaction of light oil in the reactor reduces the liquid recovery.

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