Medium and low temperature coal tar deep processing method

A technology for deep processing of low-temperature coal tar, which is applied in the petroleum industry, hydroprocessing process, and hydrocarbon oil treatment. It can solve problems that affect the thermal stability of oil products, cannot be removed in large quantities, and engine damage, so as to improve the use of oil. The effect of improving the life, improving the properties of oil products, and prolonging the service life

Inactive Publication Date: 2009-09-23
胜帮科技股份有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

Therefore, the whole fraction of coal tar should not be put into the delayed coking unit, but the light fraction should be separated first, and only the delayed coking reaction of the heavy fraction of coal tar should be carried out, so as to prevent the lighter fraction from reacting into heavy fraction or dry gas, which will affect liquid products yield
[0008] 3. Although delayed coking can remove some impurities such as sulfur and nitrogen in coal tar, a large part of it remains in the coking distillate and cannot be removed in large quantities, and it will still cause environmental pollution during combustion
More importantly, coked distillate oil contains more olefins and colloids, which will affect the thermal stability of the oil and cause engine damage

Method used

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  • Medium and low temperature coal tar deep processing method

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The low-temperature dry distillation coal tar of Yilan lignite, whose properties are shown in Table 1, is sent to the pretreatment unit to remove mechanical impurities and water and then enters the atmospheric fractionation tower 1 to fractionate light distillate oil (overhead oil) and heavy distillate oil (column bottom oil). oil) and phenol oil (phenol-containing oil extracted from the side line), the phenol oil enters the phenol oil extraction unit 2 to separate phenolic products and dephenolized oil, and the dephenolized oil is mixed with the heavy fraction and enters the delayed coking unit 3 for thermal cracking reaction Coking dry gas, liquefied petroleum gas, coking naphtha, coking diesel oil, coking wax oil and petroleum coke are produced with a reaction temperature of 490°C and a reaction pressure of 0.23MPa. Among them, the coked naphtha, coked diesel oil, coked wax oil and the light distillate oil in the atmospheric fractionation tower 1 are mixed and then en...

Embodiment 2

[0036] The low-temperature dry distillation coal tar of Yilan lignite, whose properties are shown in Table 1, is sent to the pretreatment unit to remove mechanical impurities and water and then enters the atmospheric fractionation tower 1 to fractionate light distillate oil (overhead oil) and heavy distillate oil (column bottom oil). oil) and phenol oil (phenol-containing oil extracted from the side line), the phenol oil enters the phenol oil extraction unit 2 to separate phenolic products and dephenolized oil, and the dephenolized oil is mixed with the heavy fraction and enters the delayed coking unit 3 for thermal cracking reaction Coking dry gas, liquefied petroleum gas, coking naphtha, coking diesel oil, coking wax oil and petroleum coke are produced with a reaction temperature of 500°C and a reaction pressure of 0.17MPa. Among them, the coked naphtha, coked diesel oil, coked wax oil and the light distillate oil in the atmospheric fractionation tower 1 are mixed and then en...

Embodiment 3

[0038] The low-temperature dry distillation coal tar of Yilan lignite, whose properties are shown in Table 1, is sent to the pretreatment unit to remove mechanical impurities and water and then enters the atmospheric fractionation tower 1 to fractionate light distillate oil (overhead oil) and heavy distillate oil (column bottom oil). oil) and phenol oil (phenol-containing oil extracted from the side line), the phenol oil enters the phenol oil extraction unit 2 to separate phenolic products and dephenolized oil, and the dephenolized oil is mixed with the heavy fraction and enters the delayed coking unit 3 for thermal cracking reaction Coking dry gas, liquefied petroleum gas, coking naphtha, coking diesel oil, coking wax oil and petroleum coke are produced with a reaction temperature of 500°C and a reaction pressure of 0.17MPa. Among them, the coked naphtha, coked diesel oil, coked wax oil and the light distillate oil in the atmospheric fractionation tower 1 are mixed and then en...

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Abstract

The invention discloses a medium and low temperature coal tar deep processing method. Medium and low temperature coke material is pretreated and fractionated to obtain light fraction, carbolic oil and heavy fraction, dephenolization treatment is carried out on the carbolic oil to obtain phenols product and dephenolized oil, the dephenolized oil and the above heavy fraction carry out pyrogenetic reaction jointly to obtain various carbonized products, wherein carbonized naphtha, at least one of carbonized diesel oil and carbonized wax oil is mixed with the light fraction obtained by material fractionation to carry out hydrofining and hydrocracking reaction, hydrogenated naphtha obtained by hydrocracking carries out catalytic reforming-aromatics extraction to obtain benzene, toluol, xylene, solvent oil and other products. Compared with the prior art, gasoline fraction and diesel oil fraction obtained by the inventive method are clean and stable in properties. In addition, the invention can produce a plurality of chemical products with high added value, truly realizes the effective utilization of medium and low temperature coal tar, and greatly improves the service life of devices.

Description

technical field [0001] The invention relates to a coal chemical process, in particular to a medium-low temperature coal tar deep processing process. Background technique [0002] Coal dry distillation and coal gasification are important components of the coal chemical process, and the raw materials are mostly non-caking coal or weakly caking coal. Non-caking coal or weakly caking coal includes lignite, long-flame coal, gas coal, etc. Lignite is a non-caking or weakly caking coal, and it is the coal with the lowest degree of coalification. Lignite is characterized by high moisture, low specific gravity, high volatile content, non-bonding, strong chemical reactivity, poor thermal stability, low calorific value, and contains varying amounts of humic acid. It is mostly used as fuel and raw material for gasification, and can also be used to extract montan wax, humic acid, and manufacture sulfonated coal or activated carbon. Long-flame coal also has a high volatile content, has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G69/10C10G21/02C10G9/00C10G35/04
Inventor 沈和平杨承强
Owner 胜帮科技股份有限公司
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