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Method for preparing light aromatics from coal tar

A technology of light aromatics and coal tar, applied in the field of light aromatics, can solve the problems of unguaranteed supply of raw materials, low output of crude benzene, shortage of raw materials, etc., and achieve long operation period of the device, high added value of products, and good product quality Effect

Active Publication Date: 2010-05-26
HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Catalytic reforming and steam cracking gasoline are processes for producing light aromatics from petroleum fractions. Under the unfavorable situation of limited oil reserves and rising oil prices, these processes will face shortage of raw materials, rising costs, and declining profits. question
In addition, crude benzene hydrofining is a process for the production of light aromatics that has emerged in recent years. The raw material used is crude benzene, a by-product of coal coking. Compared with the production of aromatics from petroleum fractions, the cost has been greatly reduced, but compared with coal tar, crude The output of benzene is small, the price is high, and the supply of raw materials cannot be guaranteed

Method used

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  • Method for preparing light aromatics from coal tar

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A low-temperature coal tar is used as raw material, its properties are shown in Table 1, the selective hydrogenation reaction conditions are the first reactor reaction conditions: temperature 180°C, hydrogen partial pressure 1.0MPa, hydrogen-oil ratio 200, liquid hourly space velocity 0.5h -1 ;Reaction conditions of the second reactor: temperature 260°C, hydrogen partial pressure 1.0MPa, hydrogen-oil ratio 200, liquid hourly space velocity 0.5h -1 ;. See Table 2 for properties of fractions <200°C after cutting low-temperature coal tar and oils produced by selective hydrogenation, and see Table 3 for properties of aromatics, non-aromatics and solvent oil products.

[0025] Table 1

[0026] Analysis Project

[0027] Table 2

[0028] project

[0029] project

[0030] table 3

[0031] project

[0032] project

Embodiment 2

[0034] A medium-temperature coal tar is used as a raw material, its properties are shown in Table 4, and the selective hydrogenation reaction conditions are the first reactor reaction conditions: temperature 210°C, hydrogen partial pressure 2.5MPa, hydrogen-oil ratio 600, liquid hourly space velocity 2.5h -1 ;Reaction conditions of the second reactor: temperature 290°C, hydrogen partial pressure 2.5MPa, hydrogen-oil ratio 600, liquid hourly space velocity 2.5h -1 ;. See Table 5 for properties of cut <200°C fractions and selective hydrogenated oil from low-temperature coal tar, and Table 6 for properties of aromatics, non-aromatics and solvent oil products.

[0035] Table 4

[0036] Analysis Project

value

Analysis Project

value

Exterior

black sticky

Composition, w%

/

Density at 20°C, kg / m 3 ,

966.9

saturated hydrocarbon

18.97

freezing point, ℃

24

Aromatics

13.98

Viscosity, mm2 / s

7...

Embodiment 3

[0043] A low-temperature coal tar mixed with 20% of a high-temperature coal tar light oil fraction -1 ;Reaction conditions of the second reactor: temperature 320°C, hydrogen partial pressure 5.0MPa, hydrogen-oil ratio 1000, liquid hourly space velocity 5.0h -1 . See Table 8 for properties of cut <200°C fractions of low-temperature coal tar and oils produced by selective hydrogenation, and see Table 9 for properties of aromatics, non-aromatics and solvent oil products.

[0044] Table 7

[0045] Analysis Project

[0046] Table 8

[0047] project

[0048] project

[0049] Table 9

[0050] project

[0051] project

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Abstract

The invention discloses a method for preparing light aromatics from coal tar. The method is characterized by comprising the following steps of: cutting the coal tar into light oil fraction lower than 200 DEG C and heavy oil fraction higher than 200 DEG C; sequentially enabling the light oil fraction lower than 200 DEG C to enter two fixed-bed hydrogenation reactors for selective hydrogenation refining; stripping and pre-distilling the obtained hydrogenated generating oil; and extracting, distilling and finely distilling the solvent to obtain light aromatic products, such as benzene, toluene, xylene, and the like and byproducts, such as non-aromatics and solvent oil. The invention has wide raw material resources, low production cost, long device-running period and good aromatic product quality.

Description

technical field [0001] The invention relates to the effective utilization of coal tar, in particular to a method for obtaining light aromatic hydrocarbons such as benzene, toluene and xylene by using light oil fractions of coal tar as raw materials. Background technique [0002] With the integration of the world economy and the continuous and high-speed development of my country's economy, my country's demand for various chemical raw materials is also increasing. Benzene, toluene, xylene and other light aromatic hydrocarbons are important chemical raw materials, which are mainly obtained from catalytic reforming, steam cracking gasoline and crude benzene hydrofining in industry. Catalytic reforming and steam cracking gasoline are processes for producing light aromatics from petroleum fractions. Under the unfavorable situation of limited oil reserves and rising oil prices, these processes will face shortage of raw materials, rising costs, and declining profits. question. In...

Claims

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Application Information

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IPC IPC(8): C10G67/14C10C1/10
Inventor 佘喜春朱方明李庆华郭朝辉
Owner HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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