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A kind of coal tar pretreatment method

A technology for pretreatment and coal tar, applied in the field of coal chemical industry, can solve the problems of poor purification and separation effect, unable to operate for a long time, unable to meet feeding requirements, etc., and achieve the effects of improving liquid yield, good economic benefits and environmental protection benefits

Active Publication Date: 2019-11-15
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

These separation methods and technologies all have defects such as poor separation effect and low efficiency, and the biggest problem is that the existing separation methods and technologies cannot remove impurities in coal tar, especially metal elements (iron, calcium, sodium, magnesium, nickel, etc.) , copper, arsenic) are separated in layers, the purification and separation effect is poor, and the efficiency is low. It cannot meet the feed requirements of the subsequent hydrogenation production unit for coal tar, and cannot solve the bed blockage in the hydrogenation process of the whole fraction of coal tar. running problem

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  • A kind of coal tar pretreatment method

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Embodiment 1

[0029] In this embodiment, a coal tar pretreatment process is used for testing. The medium and low temperature coal tar produced by coal dry distillation in Xinjiang was selected as the test raw material. The properties of the whole fraction of coal tar are shown in Table 1. The coal tar raw material is heated to 80°C, the pretreatment gas is chlorine gas, the reaction pressure of the pretreatment reactor is 0.1MPa, the reaction temperature is 80°C, the gas-oil ratio is 1:1, the pretreatment gas is in countercurrent contact with the coal tar, and the acidic substance is inorganic acid Hydrochloric acid, the concentration of hydrochloric acid aqueous solution is 1.0%, the mass ratio of hydrochloric acid aqueous solution to coal tar is 2:1, the coal tar obtained after reacting with the pretreatment gas and hydrochloric acid aqueous solution are passed into the static mixer, and after being fully mixed, enter the sedimentation Separator, the temperature of the sedimentation separ...

Embodiment 2

[0037] The whole distillate coal tar is heated to 100°C, the pretreatment gas is chlorine dioxide, the reaction pressure of the pretreatment reactor is 1.0MPa, the reaction temperature is 100°C, the gas-oil ratio is 50:1, the pretreatment gas is in countercurrent contact with the coal tar, and the acidic substance Select inorganic acid sulfuric acid, the concentration of sulfuric acid aqueous solution is 2.5%, the mass ratio of sulfuric acid aqueous solution to coal tar is 3:10, and the coal tar obtained after reacting with the pretreatment gas and sulfuric acid aqueous solution are passed into the static mixer together, and after fully mixing Enter the sedimentation separator, the temperature of the sedimentation separator is 100°C, and it is divided into three layers in the sedimentation separator. The property analysis of the above-water oil and the underwater oil is shown in Table 3.

Embodiment 3

[0043] The whole distillate coal tar is heated to 120°C, the pretreatment gas is sulfur trioxide, the reaction pressure of the pretreatment reactor is 0.5MPa, the reaction temperature is 120°C, the gas-oil ratio is 200:1, the pretreatment gas is in countercurrent contact with the coal tar, and the acidic substance The organic acid formic acid is selected, the concentration of formic acid aqueous solution is 5.0%, the mass ratio of formic acid aqueous solution and coal tar is 1:2, and the coal tar obtained after reacting with the pretreatment gas and formic acid aqueous solution are passed into the static mixer together, and after fully mixing Enter the sedimentation separator, the temperature of the sedimentation separator is 80°C, and it is divided into three layers in the sedimentation separator. The property analysis of the oil on the water and the oil under the water is shown in Table 4.

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Abstract

The invention discloses a coal tar pretreatment method and belongs to the technical field of coal chemical industry. The pretreatment method comprises following steps: a coal tar raw material is heated and then enters a pretreatment reactor to contact with pretreatment gas for a reaction, the pretreated coal tar obtained after the reaction is sufficiently mixed with a treating agent, a mixture obtained after uniform mixing enters a separator, and oil on water, an aqueous phase solution and oil under water are obtained after separation. Compared with the prior art, the method has the advantagesas follows: demetalizing rate is high, coal tar loss in the pretreatment process is low, coal tar recovery rate is 90% or higher, running period of a coal tar hydrogenation unit can be remarkably prolonged, technological process is simple, equipment investment is low, operating conditions are mild, and production and running cost is low.

Description

technical field [0001] The invention relates to the technical field of coal chemical industry, in particular to a method for pretreatment of full fraction coal tar. Background technique [0002] The increasing scarcity of the world's petroleum resources has made the technology of processing various unconventional petroleum resources to produce light fuel oil a hot topic, one of which is to use coal as raw material to produce clean fuel. Coal tar is a liquid product obtained in the process of coal coking, dry distillation and gasification. It is an alternative energy source with great development potential. At room temperature, coal tar is a black viscous liquid with high density, mainly composed of polycyclic aromatic Compound composition, the composition of coal tar is extremely complex. Depending on the coal carbonization temperature and process, low-temperature tar, medium-temperature tar and high-temperature tar can be obtained. [0003] At present, with the rapid deve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G53/02
CPCC10G53/02C10G2300/206
Inventor 张庆军宋永一刘继华方向晨刘文洁孙凯
Owner CHINA PETROLEUM & CHEM CORP
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