A kind of lightening method of whole distillate fraction of coal tar

Abstract

The invention relates to the field of coal chemical industry, and discloses a coal tar whole fraction lightweighting method. The method comprises the following steps: coal tar whole fraction, hydrogen and a hydrogenation catalyst I are introduced into a primary slurry bed reactor for a hydrocracking reaction to obtain a cracking reaction mixture; the cracking reaction mixture is separated to first gas, a light oil phase and a heavy oil phase; the hydrogen and the heavy oil phase are introduced into a secondary slurry bed reactor with a built-in hydrocyclone separator for a deep hydrogenation conversion reaction, and the reacted solid content ingredient and the light oil phase are introduced into a fixed bed hydrotreatment unit for hydrotreatment. According to the invention, a two-stage combined-type treatment and a fixed bed hydrocracking coupled technology flow are employed, on the based of running period guarantee, the coal tar whole fraction is directly charged, whole plant distillate oil yield is increased, and a purpose of producing a cleaning fuel with maximum degree is achieved.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a method for lightening the whole fraction of coal tar. Background technique [0002] Coal tar is a black or dark brown, viscous liquid product with a pungent smell, which is by-produced during the carbonization and / or gasification process of coal. According to the process reaction temperature, it can be divided into low-temperature coal tar (450-650°C), medium-temperature coal tar (600-1000°C) and high-temperature coal tar (greater than 1000°C). Overall, the annual output of coal tar in my country has exceeded 20 million tons. In 2011, the total production capacity of high-temperature coal tar in my country was about 22 million tons, and the actual output was about 17.5 million tons; the total production capacity of medium-low temperature coal tar was about 6 million tons, and the total output reached 3.5 million tons. In addition, a large number of coal-to-natural gas in...

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Problems solved by technology

[0009] The purpose of the present invention is to overcome the above-mentioned defects of the prior art, to maximize the conversion of the full fraction feed of coal tar into light fuels such as clean gasoline and diesel oil, and to avoid high energy consumption, short operation period, and low diesel-gasoline ratio in the existing process. The occurrence of reasonable and other issues

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