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A kind of medium and low temperature coal tar processing method

A technology of low-temperature coal tar and processing method, which is applied in the processing of tar, tar processing by distillation, and tar processing by selective solvent extraction, etc. quality content, the effect of preventing pressure drop from rising

Active Publication Date: 2017-11-28
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For coal tar with high phenol content, if it is directly hydrogenated to produce liquid fuel, a large amount of phenolic compounds will be deoxygenated and converted, and its value will decrease, resulting in economic losses

Method used

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  • A kind of medium and low temperature coal tar processing method
  • A kind of medium and low temperature coal tar processing method
  • A kind of medium and low temperature coal tar processing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060](1) At 25°C, 100g of medium-low temperature coal tar A was extracted once with 170g of 10% sodium hydroxide aqueous solution to obtain the first extract (200.6g in total) and the first raffinate. The first extract was contacted with 171 g of hydrochloric acid with a mass concentration of 10%, and the first extract was neutralized to acidity, so that the phenate in the first extract was converted into phenol. The first extract after being contacted with the acid was extracted with 75 g of dichloromethane, and the obtained second extract was evaporated to remove the dichloromethane and then dried to obtain 30.3 g of a phenol-rich fraction. The first raffinate was washed with water and then dried to obtain 69.4 g of dephenolized oil A. 0.3 g of mechanical impurities were separated from the first extract, and the material loss in the whole process was 0.3 g.

[0061] Elemental analysis was carried out on the medium and low temperature coal tar A used as raw material, the ob...

Embodiment 2

[0083] (1) At 25°C, 100g of medium-low temperature coal tar B was extracted once with 84g of 6% potassium hydroxide aqueous solution to obtain the first extract (92.61g in total) and the first raffinate. The first extract was contacted with 34.49 g of sulfuric acid with a mass concentration of 10%, and the first extract was neutralized to acidity, so that the phenate in the first extract was converted into phenol. The first extract after being contacted with acid was extracted with 30 g of dichloromethane, and the obtained second extract was evaporated to remove dichloromethane and then dried to obtain 8.21 g of a phenol-rich fraction. The first raffinate was washed with water and then dried to obtain 91.24 g of dephenolized oil B. 0.18 g of mechanical impurities were separated from the first extract, with a material loss of 0.37 g throughout.

[0084] Elemental analysis was carried out on the medium and low temperature coal tar B used as raw material, the obtained phenol-ric...

Embodiment 3

[0096] (1) At 40°C, mix 100g of medium and low temperature coal tar C with 25mL of dichloromethane, and then extract the resulting mixture with 106g of 15% sodium hydroxide aqueous solution to obtain the first extract and the first raffinate. Evaporate and remove the dichloromethane in the first extract to obtain 141.78g residual liquid, contact the residual liquid with 152g mass concentration of 10% hydrochloric acid, neutralize the residual liquid to acidity, and convert the phenate in the residual liquid into phenol . The remaining liquid after contacting with the acid was extracted with 105 g of dichloromethane, and the obtained second extract was evaporated to remove the dichloromethane and then dried to obtain 35.28 g of a phenol-rich fraction. The first raffinate was evaporated to remove dichloromethane therein, and then washed with water and dried to obtain 64.01 g of dephenolized oil C. 0.24 g of mechanical impurities were separated from the first extract, and the m...

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Abstract

The present invention discloses a medium-low temperature coal tar processing method, which comprises: carrying out a dephenolizing treatment on full-distillation range medium-low temperature coal tar being not subjected to fractionation cutting to obtain a phenol-rich component and a dephenolized oil, and optionally in a hydrotreating condition, contacting at least partial dephenolized oil and a hydrogenation catalyst. With the method, the most of the phenol compounds in the medium-low temperature coal tar can be enriched in the phenol-rich component, such that the loss of the phenol compounds can be avoided, and the adverse influence of the phenol compounds on the subsequent hydrogenation process can be avoided; and the asphaltene content in the dephenolized oil obtained through the method of the present invention is significantly reduced compared with the asphaltene content in the medium-low temperature coal tar, such that the service life of the hydrogenation catalyst in the subsequent hydrogenation process can be prolonged, and the operation stability of the hydrogenation device can be improved.

Description

technical field [0001] The invention relates to a method for processing medium and low temperature coal tar. Background technique [0002] With the increasing shortage of petroleum resources, the comprehensive utilization of coal tar has been paid more and more attention in recent years. Coal tar can not only be used to produce liquid fuels, but also can be used to extract various chemical products. [0003] For the processing and utilization of coal tar, the current conventional methods are divided into two categories: one is physical separation and extraction of chemicals, and the other is hydrogenation to produce liquid fuels. Currently, the most commonly used method is hydrogenation to produce liquid fuels. For coal tar with high phenol content, if it is directly hydrogenated to produce liquid fuel, a large amount of phenolic compounds will be deoxygenated and converted, and its value will decrease, resulting in economic losses. [0004] Based on the characteristics of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10C3/00C10C3/06C10C3/02
CPCC10C1/04C10C1/18C10C1/205C10C3/005
Inventor 赵俊鹏郭小汾刘长坤陈松张新锋
Owner CHNA ENERGY INVESTMENT CORP LTD
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