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Coal tar pretreatment purification method and system

A technology for coal tar and pretreatment, which is applied in the processing of tar, tar processing by distillation, and tar pitch/petroleum pitch/natural pitch by distillation, etc. Low yield, process and investment, and the effect of improving utilization

Pending Publication Date: 2020-08-28
胜帮科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional coal tar hydrogenation adopts fixed bed hydrogenation, because coal tar contains water, metal, asphaltenes and other impurities that affect the long-term operation of fixed bed hydrogenation catalyst, usually use vacuum distillation to remove about 15-20% rich in metals Coal tar pitch and other impurities, the rest of the components enter the hydrogenation system, and the oil yield is low

Method used

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  • Coal tar pretreatment purification method and system

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Effect test

Embodiment 1

[0046] This embodiment provides a method for pretreatment and purification of coal tar, the process of which is as follows figure 1 As shown, the method includes the following steps:

[0047] (1) Add 0.2wt% scavenger ammonium sulfate of coal tar total amount to low-temperature coal tar, adopt 120 DEG C of flash to carry out flash evaporation dehydration to described low-temperature coal tar, to the described low-temperature coal after dehydration The tar is filtered to remove solid impurities, and the dehydrated and solidified coal tar is subjected to fractionation and cutting to obtain tower top oil, sideline oil and tower bottom coal tar pitch, and the tower bottom coal tar pitch accounts for 10 wt% of the total product of the fractionation and cutting;

[0048] (2) Solvent extraction is carried out to the coal tar pitch at the bottom of the tower obtained in step (1), the solvent is pentane, the volume ratio of the solvent and the coal tar pitch at the bottom of the tower i...

Embodiment 2

[0052] This embodiment provides a method for pretreatment and purification of coal tar, the process of which is as follows figure 1 As shown, the method includes the following steps:

[0053] (1) Add scavenger ammonium phosphate of 1.0wt% of the total amount of coal tar to the medium and low temperature coal tar, and use 180° C. flash evaporation to remove moisture from the coal tar, and dehydrate the medium and low temperature coal tar filtering to remove solid impurities, and fractionating and cutting the dehydrated and desolidified coal tar to obtain top oil, sideline oil and bottom coal tar pitch, and the bottom coal tar pitch accounts for 20 wt% of the total product of the fractionation and cutting;

[0054] (2) Carry out solvent extraction to the tower bottom coal tar pitch that step (1) obtains, solvent is cyclohexane, and the volume ratio of described solvent and described tower bottom coal tar pitch is 5:1, and temperature is 120 ℃, and pressure is 1.5 MpaG, the extr...

Embodiment 3

[0058] This embodiment provides a method for pretreatment and purification of coal tar, the process of which is as follows figure 1 As shown, the method includes the following steps:

[0059] (1) Add the scavenger ammonium polyphosphate of 0.5wt% of the total amount of coal tar pitch to the medium temperature coal tar, adopt 150 DEG C of flash evaporation to carry out flash evaporation to remove the moisture of the described coal tar, to the described medium temperature coal tar after dehydration filtering to remove solid impurities, and fractionating and cutting the dehydrated and desolidified coal tar to obtain top oil, sideline oil and bottom coal tar pitch, and the bottom coal tar pitch accounts for 15 wt% of the total product of the fractionation and cutting;

[0060] (2) solvent extraction is carried out to the coal tar pitch at the bottom of the tower that step (1) obtains, and solvent is toluene, and the volume ratio of described solvent and the coal tar pitch at the b...

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Abstract

The invention provides a coal tar pretreatment purification method and system. The method comprises adding a purifying agent into coal tar, carrying out dehydration and solid removal treatment on thecoal tar, carrying out solid-liquid separation on the dehydrated and solid-removed coal tar, and then carrying out fractionation cutting to obtain column top oil, side line oil and column bottom coalpitch; carrying out solvent extraction on the obtained column bottom coal pitch, and carrying out solvent recovery treatment on an extract phase to obtain a solvent and deasphalted oil; recycling thesolvent for solvent extraction; mixing the deasphalted oil with the column top oil and the side line oil to carry out hydrotreatment; carrying out asphalt steam stripping on a raffinate phase obtainedby solvent extraction, carrying out solvent recovery on an obtained solvent and an oil product, and discharging deoiled asphalt obtained by asphalt steam stripping as a product. The method can improve the utilization rate of coal tar to the maximum extent, the purified coal tar directly enters a fixed bed hydrogenation reaction system, the process is mature and stable, and the process and investment are far lower than those of fluidized beds, slurry beds and other hydrogenation reaction systems.

Description

technical field [0001] The invention belongs to the field of coal tar treatment and relates to a method and system for pretreatment and purification of coal tar. Background technique [0002] Coal tar is a liquid product of coal in the process of pyrolysis or dry distillation and gasification. It is a dark brown viscous liquid at room temperature. The estimated composition of coal tar is about 10,000 species, and only about 500 species have been separated and identified. It is mainly aromatic compounds, and most of them are fused ring aromatic compounds with more than two rings. According to different production methods and pyrolysis temperatures, the following coal tars can be obtained: low-temperature coal tar (450-600°C), medium-low temperature coal tar (600-800°C), medium-temperature coal tar (700-900°C), high-temperature coal tar Tar (900~1000℃). [0003] Traditional coal tar hydrogenation adopts fixed bed hydrogenation, because coal tar contains water, metal, asphalt...

Claims

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Application Information

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IPC IPC(8): C10C1/06C10C1/00C10C1/16C10C3/08C10C3/06
CPCC10C1/00C10C1/06C10C1/16C10C3/06C10C3/08
Inventor 王庆元周晓晓程建龙岳广祥赵正权常伟先任鹏黄云
Owner 胜帮科技股份有限公司
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