Medium and low temperature coal tar processing method

A low-temperature coal tar and treatment method technology, which is applied in the field of coal chemical technology, can solve problems such as heavy component processing, and achieve the effects of stable performance, improved operation cycle, and high yield

Active Publication Date: 2014-04-02
上海竣铭化工工程设计有限公司
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  • Application Information

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Problems solved by technology

[0007] Aiming at the deficiencies in the prior art, the object of the present invention is to provide a process for processing the full fraction of medium-low temperature coal tar, which can not only produce high-quality oil products, but also utilize medium-low temperat

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  • Medium and low temperature coal tar processing method

Examples

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[0040] Example 1

[0041] (1) The low-temperature dry distillation coal tar of Shenmu County lignite, the properties are shown in Table 1, sent to the pretreatment unit to remove solid impurities, electric desalination and fractional distillation dehydration, and the solid in the coal tar was removed to a diameter of 50um;

[0042] (2) After the treatment in step (1), it enters the atmospheric fractionation tower for fractionation, and fractionates water, phenol oil (sideline) and heavy oil;

[0043] (3) extracting phenol from the phenol oil obtained in step (2), and entering into a phenol oil extraction device to separate refined phenol products and dephenol oil;

[0044] (4) Mixing the heavy oil obtained in step (2) and the dephenolized oil obtained in step (3) into a fluidized bed reactor for hydrogenation reaction to obtain upgraded heavy oil and sulfur- and ammonia-containing gas by-products; the reaction temperature is 360 ℃ ℃, the reaction pressure is 12MPa, the volume...

Example Embodiment

[0047] Example 2

[0048] (1) The medium and low temperature dry distillation coal tar of Shenmu County lignite, the properties are shown in Table 2, sent to the pretreatment unit to remove solid impurities, electric desalination and fractional distillation dehydration, and the solid in the coal tar was removed to a diameter of 40um;

[0049] (2) After the treatment in step (1), it enters the atmospheric fractionation tower for fractionation, and fractionates water, phenol oil (sideline) and heavy oil;

[0050] (3) extracting phenol from the phenol oil obtained in step (2), and entering into a phenol oil extraction device to separate refined phenol products and dephenol oil;

[0051] (4) mixing the heavy oil obtained in step (2) and the dephenolized oil obtained in step (3) into a fluidized bed reactor to carry out hydrogenation reaction to obtain upgraded heavy oil and sulfur- and ammonia-containing gas by-products; the reaction temperature is 380 ℃ ℃, the reaction pressure ...

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Abstract

The invention belongs to the field of the coal chemical industry, and in particular relates to a medium and low temperature coal tar processing method. The method comprises the following steps: removing solid residues from the medium and low temperature coal tar, preprocessing the coal tar to obtain carbolic oil, water and heavy oil; performing phenol extraction on the obtained carbolic oil to obtain a pure phenol product and dephenolized oil; mixing the obtained heavy oil and the obtained dephenolized oil and introducing the mixture in a fluidized bed reactor to perform a hydrogenation reaction, and obtaining modified heavy oil, sulfur-containing and ammonia-containing gas side products; performing hydrorefining and hydrocracking reactions on the modified heavy oil to obtain dry gas, liquefied gas, naphtha, a diesel oil product and a tail oil product. The naphtha and the diesel oil are clean and stable in performance. In addition, a plurality of high value added products are obtained. After hydrotreatment of the fluidized bed, the catalyst service life of the fixed bed reactor is prolonged; furthermore, the heavy component processing problem in the coal tar can be solved. The modified heavy oil after hydrotreatment of the fluidized bed can be subjected to hydrorefining and hydrocracking to improve the oil property.

Description

technical field [0001] The invention belongs to the field of coal chemical technology, and in particular relates to a method for processing medium-low temperature coal tar. 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. Lignite, long-flame coal, gas coal and other non-caking coals or weakly caking coals are rich in organic matter. In addition to producing semi-coke during medium-low temperature carbonization, they can also generate gas and coal tar. The quality of coal tar The output is generally between 6% and 15%; this kind of coal is gasified to produce coal gas (civil fuel) or synthetic gas (CO+H 2 ) When producing other chemical products, coal tar will also be produced, and the mass yield of coal tar is generally between 4% and 12%. [0003] Since medium and low temperature coal tar comes from coal dry distillation a...

Claims

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Application Information

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IPC IPC(8): C10G67/14C10C1/00
Inventor 刘利王小英杨承强
Owner 上海竣铭化工工程设计有限公司
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