Method for preprocessing coal tar

A coal tar and pretreatment technology, which is applied in the field of removing impurities from coal tar, can solve the problems of unsuitable coal tar pretreatment, low degree of automation, and high labor intensity, so as to achieve good economic benefits for enterprises, improve processing capacity, The effect of low labor intensity

Active Publication Date: 2013-01-30
HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Although this extraction method improves the utilization rate of coal tar and reduces energy consumption, it adopts a gravity sedimentation separation process, which requires many storage tanks for separation, a low degree of automation, and high labor intensity, so it is not suitable for large-scale coal extraction. Tar for pretreatment

Method used

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  • Method for preprocessing coal tar

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Mix 2000g of full cut medium and low temperature coal tar with 2000g of catalytic diesel oil (mass ratio 1:1), heat the resulting mixture to 60°C, pre-separate it with a hydrocyclone, and then centrifuge it with a horizontal screw sedimentation centrifuge Separation, 3623g of catalytic diesel soluble matter and 377g of extraction insoluble matter were separated. Mix the extracted insolubles with 1508g of benzene (mass ratio 1:4), heat the resulting mixture to 60°C, and perform centrifugation on a horizontal spiral sedimentation centrifuge to separate 1844g of benzene solubles and 39g of benzene insolubles (ie raffinate). Catalyzed diesel solubles and benzene recovery solubles are uniformly mixed as feed components for coal tar hydrotreating. The impurity content and extraction yield of coal tar after pretreatment are shown in Table 1.

Embodiment 2

[0025] Mix 1000g coal tar heavy oil (>350℃ fraction) with 4000g coal tar hydrogenation unit’s hydrogenated oil >160℃ distillate (mass ratio 1:4), heat the mixture to 150℃, and enter it in a tangential way The continuous settling tank is used for pre-separation, and then the horizontal spiral sedimentation centrifuge is used for centrifugation to separate 4574g of distillate soluble matter and 426g of extracted insoluble matter. The extracted insolubles were mixed with 426g of toluene (mass ratio 1:1), and the resulting mixture was heated to 100°C, and centrifuged in a horizontal spiral sedimentation centrifuge to separate 814g of toluene solubles and 38g of raffinate. The distillate soluble matter and the recovered toluene soluble matter were uniformly mixed and used as the feedstock component for coal tar hydrotreating. The impurity content and extraction yield of coal tar after pretreatment are shown in Table 1.

Embodiment 3

[0027] Mix 1000g of coal tar gasoline and diesel fraction (<350°C fraction) after extracting phenol and naphthalene with 3000g of kerosene (mass ratio 1:3), heat the resulting mixture to 120°C, and enter the continuous settling tank in a tangential way for pre-separation. Carry out centrifugation with a horizontal spiral sedimentation centrifuge again, isolate kerosene soluble matter 3845g and extract insoluble matter 155g. Mix the extracted insolubles with 310g of xylene (mass ratio 1:2), heat the resulting mixture to 150°C, and conduct centrifugation in a horizontal spiral sedimentation centrifuge to separate 438g of xylene solubles and 27g of raffinate . The kerosene soluble matter and the soluble matter recovered from xylene were uniformly mixed and used as the feedstock component for coal tar hydro-upgrading. The impurity content and extraction yield of coal tar after pretreatment are shown in Table 1.

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Abstract

The invention discloses a method for preprocessing coal tar. The method comprises the following steps of: mixing the coal tar and an extractant A in a mass ratio of 1:1-1:4, heating the mixture to the temperature of between 60 and 150 DEG C, pre-separating the obtained mixed solution, and performing continuous centrifugal separation on the materials on the bottom part to obtain soluble matters and impurity-containing extraction insoluble matters. The method has the advantages of good impurity-removing effect, high utilization ratio of the coal tar (over 96 percent), simple and practical process, continuous operation, low labor intensity and low energy consumption, and suitability for large-scale preprocessing of the raw materials of the coal tar and comprehensive utilization and deep processing of the coal tar which is the byproduct in the coal chemical industry.

Description

technical field [0001] The invention relates to the field of deep processing of coal tar, in particular to a method for removing impurities from coal tar. Background technique [0002] The production of clean fuel oil by hydrogenation and upgrading of coal tar is a hot project of great concern in the processing and utilization of coal tar. However, there are still many technical difficulties in the hydrogenation and upgrading process of coal tar that need to be improved, among which the pretreatment of coal tar raw material is a problem that must be solved in the hydrogenation of coal tar. [0003] Because metal and inorganic ash are easy to deposit on the coal tar hydrogenation catalyst, the pores of the catalyst will be blocked, and the hydrogenation activity of the catalyst will be reduced. In severe cases, the hydrogenation unit will be shut down abnormally. The purpose of coal tar pretreatment is to remove metal impurities, inorganic ash, and some heavy components that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G53/06
Inventor 李庆华刘呈立佘喜春
Owner HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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