Catalytic hydrogenation method and catalytic hydrogenation apparatus for coal tar

A technology for catalytic hydrogenation and coal tar, applied in the field of coal chemical industry, can solve problems such as increased processing cost, environmental damage, and reduced yield of final products, and achieves the effects of saving equipment investment, prolonging the start-up period, and reducing operating costs.

Active Publication Date: 2013-03-20
CCTEG CHINA COAL RES INST
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Problems solved by technology

Through research, it is found that due to the high viscosity and high boiling point of the normal bottom heavy oil in this process, no matter which method is used for filtration separation, centrifugal separation or vacuum distillation separation, there will be relatively high organic materials in the catalyst residue. And the separation cost is high
The high organic content in the catalyst residue will lead to an inc

Method used

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  • Catalytic hydrogenation method and catalytic hydrogenation apparatus for coal tar
  • Catalytic hydrogenation method and catalytic hydrogenation apparatus for coal tar
  • Catalytic hydrogenation method and catalytic hydrogenation apparatus for coal tar

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Example Embodiment

[0038] Preparation of the catalyst slurry. The role of the catalyst slurry is to add an appropriate amount of catalyst 12 and additives 13 to the heavy oil fraction to prepare for the catalytic hydrocracking reaction. There are three ways to prepare the catalyst slurry. The first way is to separate a small part from the heavy oil fraction 11 and add catalysts and additives to this part of the heavy oil fraction; the second way is to add catalysts and additives to all or part of the circulating tail oil. ; The third way is to separate a small part from the heavy oil fraction and mix it with all or part of the circulating tail oil and add catalysts and additives; then fully mix it under normal pressure and at a temperature of 80℃-200℃ to make a catalyst slurry. The weight percentage of solid matter in the catalyst oil slurry is 20-45%, preferably 25-40%.

[0039] Mix the catalyst oil slurry with the remaining heavy oil fraction (if it is the catalyst oil slurry obtained by route tw...

Example Embodiment

[0046] Example 1

[0047] A typical coal tar is selected as the test raw material, and the test scale is 100.0 kg coal tar / day. The pretreatment and distillation are carried out according to step 1. The product status is shown in the following table:

[0048]

[0049] The pretreated coal tar is separated into heavy fractions at IBP~230℃, 230~370℃ and over 370℃ through distillation. The heavy distillate oil over 370℃ is used as the raw material of the suspended bed hydrogenation reactor for lightening reaction.

[0050] According to the above step 2, a small part of the circulating tail oil and a small part of the heavy oil fraction, together with the catalyst and sulfiding agent, are used to prepare a catalyst slurry at 80°C. The solid concentration of the catalyst slurry is about 25% . The catalyst used is a powdery molybdenum-iron composite catalyst with a particle size of less than 100 μm, and the molybdenum: iron is equal to 1:500 (weight ratio), and the vulcanizing agent is dim...

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Abstract

The invention relates to a catalytic hydrogenation method and a catalytic hydrogenation apparatus for coal tar. The catalytic hydrogenation method comprises the following steps of performing atmospheric distillation on raw materials of the coal tar to obtain at least a carbolic oil fraction, a diesel fraction and a heavy oil fraction; performing slurry-bed hydrocracking on the heavy oil fraction to obtain a slurry-bed hydrocracking product; separating the slurry-bed hydrocracking product to obtain a liquid phase and solid phase mixed flow of high pressure separated oil and low pressure separated oil and a hydrogen-rich gas; filtering a part of the liquid phase and solid phase mixed flow of the high pressure separated oil and the low pressure separated oil to obtain a catalyst residue and a filter solution; performing atmospheric distillation separation on the filter solution and the residual liquid phase and solid phase mixed flow of the high pressure separated oil and the low pressure separated oil to obtain a light fraction and a catalyst-containing tail oil at the bottom of a tower; and recycling the catalyst-containing tail oil at the bottom of the tower to the slurry-bed hydrocracking reaction for reprocess. The method decreases the difficulty of catalyst residue separation and reduces the content of organic materials in the catalyst residue, so that the utilization rate of the raw materials and the efficiency of the catalyst can be increased.

Description

technical field [0001] The invention relates to a coal tar treatment technology in the field of coal chemical industry, in particular to a coal tar catalytic hydrogenation method and device for producing engine fuel and chemical raw materials using coal tar as a raw material. Background technique [0002] Coal tar is an important by-product in the coal pyrolysis and carbonization process. It is an extremely complex mixture. According to the different coal pyrolysis and carbonization temperatures and process methods, coal tar can be divided into low-temperature coal tar, medium-temperature coal tar and high-temperature coal tar. Coal tar, its composition varies greatly. With the development and application of coal gasification, especially lignite fixed-bed gasification technology, the production of medium and low temperature coal tar has increased rapidly. According to statistics, the production capacity of medium and low temperature coal tar reached 2.5 million tons in 2010 ...

Claims

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Application Information

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IPC IPC(8): C10G67/14
Inventor 张晓静李培霖王雨王勇赵鹏胡发亭石智杰颜丙峰黄澎赵渊杜淑凤张帆谷小会朱肖曼吴艳钟金龙
Owner CCTEG CHINA COAL RES INST
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