Method for preprocessing coal tar

A technology for coal tar and pretreatment, which is applied in the direction of multi-stage series refining process treatment, etc., can solve the problems of unsuitable coal tar pretreatment, low degree of automation, high labor intensity, etc. Low-intensity, highly automated effects

Active Publication Date: 2010-09-22
HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Mix 1000g of full-fraction medium and low-temperature coal tar with 500g of catalytic diesel oil (mass ratio 1:0.5), heat the resulting mixture to 100°C, and use a horizontal spiral sedimentation centrifuge for centrifugation to separate 1423g of catalytic diesel solubles And extract insoluble matter 77g. The extracted insolubles were mixed with 308g of benzene (mass ratio 1:4), and the resulting mixture was heated to 50°C, and centrifuged on a horizontal spiral sedimentation centrifuge to separate 356g of benzene solubles and 29g of 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°C fraction) with 3000g coal tar hydrogenation unit hydrogenated oil >160°C fraction (mass ratio 1:3), heat the mixture to 150°C, and use a horizontal screw The sedimentation centrifuge performs the first centrifugation, and separates 3548g of distillate soluble matter and 452g of extracted insoluble matter. The extracted insoluble matter is mixed with 904g of hydrogenated oil and diesel fraction from the coal tar hydrogenation unit, the resulting mixture is heated to 150°C, and the second centrifugation is carried out on a disc-type continuous centrifuge with a higher separation factor, and the final separation 1110g diesel oil soluble matter and 246g extraction insoluble matter were obtained. The extracted insolubles were mixed with 246g 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 457g of toluene solubles and 35g of raffinate. ...

Embodiment 3

[0027] Mix 1000g of coal tar gasoline and diesel fraction (9 -C 12 aromatics solvent oil (mass ratio 1:2) mixed, the resulting mixture was heated to 150 ° C, and centrifuged in a horizontal spiral sedimentation centrifuge to separate 852 g of heavy aromatics solubles and 132 g of raffinate. The raffinate was mixed with 264g of toluene again, and the resulting mixture was heated to 100°C, and then centrifuged for the second time on a disc-type continuous centrifuge with a higher separation factor, and finally 354g of toluene soluble matter and 22g of raffinate were separated. The solubles of hydrotreated diesel oil, heavy aromatics, and solubles recovered from toluene were evenly mixed as feed components for coal tar hydrogenation 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 1:0.5-1:4, heating the mixture to the temperature of between 50 and 150 DEG C, and performing continuous centrifugal separation on the obtained mixed solution in a sedimentation type centrifuge 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 process, high automaticity, andlow labor intensity, and suitability for large-scale preprocessing of the coal tar and comprehensive utilization and deep processing of full-cut coal tar which is the byproduct in industries such as coal chemical industry, coal gasification industry and the like..

Description

technical field [0001] The invention relates to deep processing of coal tar, in particular to a pretreatment method for removing impurities from coal tar before hydrogenation of coal tar. Background technique [0002] With the rapid growth of the world economy, oil as a non-renewable resource is decreasing day by day, and the price of crude oil continues to rise, the world's energy will face very severe challenges. In recent years, coal tar has been developing rapidly as a liquid alternative energy source, and its output is also increasing. At present, coal tar is generally sold as a low-quality fuel after reconciliation, and its product quality is poor and the environment is seriously polluted. Therefore, the deep processing and effective utilization of coal tar are deeply concerned and valued by the petrochemical and coal chemical industries. [0003] Hydrogenation of coal tar to produce high-quality fuel oil is one of the important ways to effectively utilize coal tar i...

Claims

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Application Information

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Patent Type & Authority Applications(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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