Method for producing lightweight fuel oil by coal tar heavy fractioning hydrogenation

Abstract

The invention discloses a method for producing quality of light fuel oil through hydrogenation of heavy coal tar distillate. The method is that technics of refining hydrogen-hydrocracking portfolio is used, which includes: the heavy coal tar distillate and hydrogen mix and go into heydrogenation reaction zone, effluent after refining changes into naphtha, diesel oil and heavy distillate though a segregation system, the heavy distillate goes into hydrocracking reaction zone, the part or the all of the hydrocracking reaction effluent circularly are acted as incoming stock of the refining hydrogen, and the left part goes into the segregation system. Compares to the prior art, the invention broadens the raw material resource for producing the light fuel oil, promotes economical efficiency for production of the heavy coal tar distillate, provides a higher value-added application method for the heavy coal tar distillate.

Description

technical field [0001] The invention discloses a method for producing light fuel oil by hydrogenation of heavy fractions of coal tar. The heavy fractions of coal tar are used as raw materials, and high-quality light fuels are produced through the method of hydrofining-hydrocracking-hydrogenation upgrading Oil. Background technique [0002] The increasing scarcity of the world's petroleum resources has made the technology of processing various unconventional petroleum resources to produce light fuel oil a hot topic, one of which is to use coal as raw material to produce clean fuel. [0003] Coal tar heavy fraction is one of the fractions obtained by distillation of low, medium and high temperature coal tar. Its initial boiling point is 180-260°C and final boiling point is 400-600°C. It is mainly composed of anthracene, phenanthrene, carbazole, acenaphthene and other compounds. Mixtures of aromatics, mostly aromatics with three or more rings, density (20°C) greater than 1.0g / ...

AI Technical Summary

Problems solved by technology

Although in this process, according to the characteristics of high nitrogen and iron content in coal tar, the hydrogenation refining catalyst containing titanium and the hydrogenation upgrading catalyst containing titanium oxide and molecular sieve are specially selected, but in this process, the hydrogenation upgrading catalyst loses The working speed is fast, the operation cycle is short, and it is not suitable for processing heavy fractions of coal tar with high impurity content and heavy fractions.

Moreover, the freezing point of the diesel produced by this process is too high (-4°C), which cannot meet the requirements for use in cold northern regions with a freezing point of less than -40°C.

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