Method for processing full-range oil in coal tar

A processing method and full-fraction technology, applied in the field of coal chemical industry, can solve problems such as unreasonable diesel-steam ratio in the process, affecting the reaction severity of the fixed-bed refining section, and high toxicity, and achieve the effect of avoiding high energy consumption

Active Publication Date: 2017-05-10
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this existing technology requires complex pretreatment of the whole fraction of coal tar, and it is difficult to ensure long-term operation when the material recycled to the slurry bed reaction unit is filtered.
[0005] Specifically, the prior art mainly has the following problems: first, the raw material of coal tar has high viscosity, wherein water or solid particles and coal tar etc. wrap each other, so it is difficult to separate and purify, and the separated water contains a large amount of phenol, polyphenols, etc. Pollutants such as cycloaromatic hydrocarbons are highly toxic and difficult to treat and purify; secondly, if the coal tar raw material is cut by distillation,

Method used

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  • Method for processing full-range oil in coal tar
  • Method for processing full-range oil in coal tar
  • Method for processing full-range oil in coal tar

Examples

Experimental program
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Effect test

Embodiment 1

[0092] The secondary slurry bed reactor in Example 1 is a slurry bed reactor with an external hydrocyclone, and this embodiment uses figure 2 The process flow chart shown carries out the processing method of the whole distillate oil of coal tar. The specific operation method is as described in the above preferred specific embodiments of the present invention.

[0093] Moreover, the structure of the two-stage slurry bed reactor in this embodiment is as follows image 3 As shown in, the structure of the hydrocyclone in this embodiment is as follows figure 1 shown in . The structure of the first-stage slurry bed reactor in this embodiment is similar to that of the second-stage slurry bed reactor, the difference is that the first-stage slurry bed reactor does not contain a hydrocyclone. And the volume of the inner chamber of the first-stage slurry-bed reactor and the second-stage slurry-bed reactor is the same.

[0094] In this embodiment, the length of the sleeve is 3 / 5 of t...

Embodiment 2-4

[0101] Embodiment 2-4 adopts the technical process identical with embodiment 1 to carry out, and difference is that process condition is different, specifically, the relevant reaction conditions and the result in the one-stage slurry bed reactor of embodiment 2-4 are as table Shown in 2; Relevant reaction conditions and results in the two-stage slurry bed reactor are as shown in Table 3; Relevant reaction conditions and results of fixed-bed hydrotreating unit are as shown in Table 4, and product properties are shown in Table 5 .

[0102] Table 2

[0103]

[0104] table 3

[0105] Example 1 Example 2 Example 3 Example 4 Reaction conditions Pressure / MPa 16.0 16.0 18.0 18.0 temperature / ℃ 400 400 410 410 Liquid hourly volumetric space velocity / h -1

0.2 0.5 0.2 0.5 Hydrogen oil volume ratio 1000 1500 1000 1500 Reaction result / wt% second gas 1.73 1.38 1.96 1.55 low density phase 98...

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Abstract

The invention relates to the field of coal chemical industry and discloses a method for processing full-range oil in coal tar; the method comprises: introducing full-range oil of coal tar, hydrogen and hydrogenation catalyst I into a primary slurry-bed reactor for hydrocracking reaction; separating cracked mixture; introducing hydrogen, hydrogenation catalyst II and the obtained heavy oil into a secondary slurry-bed reactor with external cyclone hydraulic separator to carry out mild hydro-conversion reaction, introducing the reacted material obtained through the mild hydro-conversion reaction into the cyclone hydraulic separator for separating; circulating the obtained high-concentration phase back to the secondary slurry-bed reactor, and introducing light oil and low-density phase into a fixed-bed hydrogenation apparatus for hydrogenation reaction. By processing the full-range oil of coal tar through the method of the invention, it is possible to maximally produce clean fuels. The method of the invention may also prevent the problems of the prior art, such as high energy consumption, short operation cycle, and unreasonable diesel-gasoline ratio.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a method for processing whole distillate oil of coal tar. Background technique [0002] Coal tar is a black or dark brown, viscous liquid product with a pungent odor produced by coal in the dry distillation and gasification process. 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 installations in m...

Claims

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Application Information

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IPC IPC(8): C10G67/00
Inventor 王蕴吴治国王卫平王鹏飞崔龙鹏汪燮卿
Owner CHINA PETROLEUM & CHEM CORP
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