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Coal tar hydrotreatment process

A technology for hydrotreating and coal tar, which is applied in the processing of tar, tar processing by distillation, tar processing by chemical extraction, etc. It can solve the problems affecting the operation cycle of the hydrogenation unit and the high metal content, and reduce the nitrogen content. , The effect of reducing operating temperature and prolonging service life

Active Publication Date: 2020-05-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the deficiencies of the prior art, the present invention provides a coal tar hydrogenation process, which can produce high-quality fuel oil, and solves the problem of affecting the operation cycle of the hydrogenation device due to the high content of metals and mechanical impurities in the coal tar raw material. problems, while reducing the reaction temperature of the hydrotreating process, reducing energy consumption and improving safety

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0035] The coal tar raw material is mixed with the diesel fraction obtained by processing coal tar in the hydrogenation unit at a ratio of 5:1 to obtain a mixed stream, and then mixed with a sulfuric acid solution with a concentration of 6% at a ratio of 1:5 in the pickling cyclone separator , carry out pickling treatment, and complete the oil-water separation at the same time to obtain an aqueous solution phase and an oil phase. The oil phase and distilled water enter the water-washing cyclone separator at a ratio of 1:5, and at the same time of water washing, the oil-water separation is completed to obtain the water phase and the feed to the hydrotreating reactor. The feed to the hydrotreating reactor is mixed with hydrogen and enters the hydrotreating reactor, where it contacts with the hydrotreating catalyst and the hydrocracking catalyst, and reactions such as hydrodesulfurization, hydrodenitrogenation, and hydrocracking occur, and the hydrotreating catalyst and The ratio...

Embodiment 2

[0037] The coal tar raw material is mixed with the diesel fraction obtained by processing coal tar in the hydrogenation unit at a ratio of 6:1 to obtain a mixed stream, and then mixed with a sulfuric acid solution with a concentration of 6% at a ratio of 1:4 in the pickling cyclone separator , carry out pickling treatment, and complete the oil-water separation at the same time to obtain an aqueous solution phase and an oil phase. The oil phase and water enter the water-washing cyclone separator at a ratio of 1:4. While washing with water, the oil-water separation is completed to obtain the water phase and the feed to the hydrotreating reactor. The feed to the hydrotreating reactor is mixed with hydrogen and enters the hydrotreating reactor, where it contacts with the hydrotreating catalyst and the hydrocracking catalyst, and reactions such as hydrodesulfurization, hydrodenitrogenation, and hydrocracking occur, and the hydrotreating catalyst and The ratio of hydrocracking catal...

Embodiment 3

[0039] The coal tar raw material is mixed with the diesel fraction obtained by processing coal tar in the hydrogenation unit at a ratio of 7:1 to obtain a mixture stream, and then mixed with a sulfuric acid solution with a concentration of 8% at a ratio of 1:3 in the pickling cyclone separator , carry out pickling treatment, and complete the oil-water separation at the same time to obtain an aqueous solution phase and an oil phase. The oil phase and water enter the water-washing cyclone separator at a ratio of 1:5, and at the same time of water washing, the oil-water separation is completed to obtain the water phase and the feed to the hydrotreating reactor. The feed to the hydrotreating reactor is mixed with hydrogen and enters the hydrotreating reactor, where it contacts with the hydrotreating catalyst, and reactions such as hydrodesulfurization and hydrodenitrogenation occur, and the obtained oil enters the high-pressure separator, and the separated hydrogen is purified Aft...

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Abstract

The invention discloses a coal tar hydrotreatment process. The process comprises the following steps: (1) mixing a coal tar raw material with a diesel fraction obtained by a hydrotreating unit to obtain a mixture flow A, and then sequentially carrying out acid pickling treatment and water washing treatment to obtain a hydrotreating unit feed; and (2) feeding the hydrotreating unit feed obtained instep (1) and hydrogen into the hydrotreating unit, contacting the hydrotreating unit feed with a hydrotreating catalyst, carrying out a hydrogenation reaction, and fractionating the obtained hydrogenation reaction product to obtain naphtha, diesel oil, fuel oil, tail oil and other fractions. High-quality fuel oil can be produced, the problem that the operation period of a hydrogenation device isinfluenced due to the fact that the content of metal, mechanical impurities and the like in the coal tar raw material is high is solved, the reaction temperature in the hydrotreatment process is reduced, energy consumption is reduced, and safety is improved.

Description

technical field [0001] The invention relates to the field of coal tar processing and utilization, in particular to a coal tar hydrotreating process. Background technique [0002] With the rapid development of modern coal chemical industry (leading by coal gasification), such as coal-to-natural gas, coal-to-methanol, coal-to-olefins, coal-to-ethylene glycol, coal-to-aromatics, and coal-to-oil, etc., coal tar is especially Coal tar production presents a rapid growth trend. [0003] At present, the ways of processing and utilizing coal tar in foreign countries are mainly divided into the following aspects: First, the extraction of monomer products is the main method. Industrialization mainly produces chemical products such as phenol, refined naphthalene, and anthraquinone; the second is mainly the deep processing of asphalt, represented by Mitsubishi Corporation of Japan, Rilly of the United States and Koppars of Australia, the main purpose of which is to produce needle coke...

Claims

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Application Information

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IPC IPC(8): C10C1/20
CPCC10C1/14C10C1/20C10C1/205
Inventor 彭冲方向晨曾榕辉吴子明王仲义
Owner CHINA PETROLEUM & CHEM CORP
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