Production method of coal-based high-aromatic-hydrocarbon-potential-content naphtha for catalytic reforming, product and application thereof

Abstract

The invention relates to a production method of coal-based high-aromatic-hydrocarbon-potential-content naphtha for catalytic reforming and application. The method comprises the following steps of: a) hydrogenation: full-cut liquefied oil produced by direct liquefaction of coal is mixed with hydrogen to obtain a mixture, the mixture enters an expanded-bed hydrotreating reactor after mixing and is contacted with a hydrotreating catalyst so as to carry out hydrogenation reaction, a material flow which flows out of an outlet of the expanded-bed hydrotreating reactor is separated and fractionated,and light-weight distillate, middle-weight distillate and heavy-weight distillate are obtained; and b) deep hydrorefining: after the light-weight distillate, the middle-weight distillate and the heavy-weight distillate obtained in the step a) are mixed together and then mixed with hydrogen to obtain a mixture, the obtained mixture enters a fixed-bed deep hydrorefining reactor and is contacted with a hydrorefining catalyst so as to carry out chemical reaction, a material flow which flows out of an outlet of the fixed-bed deep hydrorefining reactor is separated and fractionated, the high-aromatic-hydrocarbon-potential-content naphtha cut meeting the requirement of catalytic reforming feeding is obtained, and the service life of the catalyst is prolonged.

Description

technical field [0001] The invention relates to a method for further processing liquefied oil obtained by directly liquefying coal. More specifically, it relates to a method for producing naphtha with a very high potential content of aromatic hydrocarbons suitable for catalytic reforming feedstock from crude oil obtained by direct liquefaction of coal, the product obtained by the method and its application. Background technique [0002] With the rapid development of my country's economy and the improvement of people's living standards, the demand for aromatic hydrocarbons is also increasing. It is mainly reflected in the demand for aromatic hydrocarbons in chemical fiber production and the demand for aromatic hydrocarbons in high-octane motor gasoline blending components. Aromatic hydrocarbons mainly come from the catalytic reforming of naphtha to produce oil and the cracked naphtha produced by steam cracking to produce ethylene. [0003] The raw materials for catalytic re...

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Problems solved by technology

[0008] Compared with petroleum-based naphtha (straight-run naphtha and hydrocracked naphtha), coal-based naphtha has its own characteristics. Coal-based naphtha has a high potential content of aromatics and is a good raw material for catalytic reforming. But at the same time, its sulfur and nitrogen content are very high, usually above 1000μg / g, so it is an unqualified catalytic reforming raw material

However, none of the above disclosed patent technologies mentioned how to convert coal-based naphtha into a qualified raw material for catalytic reforming

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