Medium and low temperature coal tar processing method

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...

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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 temperature coal tar to the greatest extent; Catalyst life, while solving the problem of heavy component processing in coal tar; the modified heavy oil after fluidized bed hydrogenation is then subjected to hydrofining and hydrocracking, which improves the properties of the oil

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