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Coal tar heavy fraction suspension-bed hydrocracking method and system thereof

A technology for hydrocracking and heavy fractions, applied in the field of coal chemical industry, can solve the problems of reducing the service life of the catalyst, difficult to control the production operation, increasing the pressure of the bed layer, etc., and achieves the effects of easy control, long start-up period, and large operation flexibility.

Inactive Publication Date: 2011-02-02
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the heavy components of coal tar coke quickly at high temperature, it is easy to block the bed layer, resulting in an increase in bed pressure, making it difficult to control the production operation, and also prone to overheating, which greatly reduces the service life of the catalyst

Method used

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  • Coal tar heavy fraction suspension-bed hydrocracking method and system thereof
  • Coal tar heavy fraction suspension-bed hydrocracking method and system thereof
  • Coal tar heavy fraction suspension-bed hydrocracking method and system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0025] Using the above figure 1 In the coal tar heavy fraction suspended bed hydrocracking system shown, the coal tar heavy fraction 1, catalyst 2 and vulcanizing agent 3 are sent to the mixer 4 according to the required ratio, and the mixer is uniformly mixed with a strong stirrer, and the The mixed material is sent to the vulcanizer 7 by the high-pressure pump 5 for vulcanization, and the hydrogen-rich 10 in the vulcanization process is separated by the condensation separator 8 to separate the water 9 for recycling. Circulating rich hydrogen 10 is mixed with low-pressure hydrogen 6 and enters sulfurizer 7. The material from sulfurizer 7 is mixed with high-pressure hydrogen 13, circulating hydrogen 16 and circulating tail oil 23 through high-pressure pump 11 and then enters preheating furnace 12. The preheated The material is sent to the suspended bed reactor 14 for hydrocracking reaction, and the reaction product is sent to the high-pressure separator 15 for gas-liquid separ...

Embodiment 5～8

[0029] Using the above figure 1 The test method and process of the suspended bed hydrocracking system for the heavy fraction of coal tar shown are the same as those of the above-mentioned Examples 1-4.

[0030] In the test, the addition amount of 4 kinds of heavy fractions of coal tar is 15kg / h, and the catalyst composition is Mo8%, Ni0.4%, Ce0.3%, P0.4%; Speed ​​0.4h -1 The first-stage vulcanization is carried out under the same conditions, and then the temperature is raised to 330°C, and the second-stage vulcanization is carried out under the same conditions as above. During the vulcanization process, the volume ratio of hydrogen to oil is 600, DMS is used as the vulcanizing agent, and the addition amount is 0.3% (calculated based on the mass of heavy fraction of coal tar). The preheating temperature of the material after vulcanization is 370°C. The reaction conditions and results of the suspension bed hydrocracking test are shown in Table 3.

[0031] Table 3 Reaction con...

Embodiment 9～12

[0034] Using the above figure 1 The test method and process of the suspended bed hydrocracking system for the heavy fraction of coal tar shown are the same as those of the above-mentioned Examples 1-4.

[0035] In the test, the addition amount of the heavy fraction of coal tar was 20kg / h, and the catalyst composition was Mo6%, Ni0.6%, Ce0.5%, P0.5%; the four mixed materials were all mixed at 0.4MPa, 200°C, and the space velocity was 0.2 h -1 The first-stage vulcanization is carried out under the same conditions, and then the temperature is raised to 340°C, and the second-stage vulcanization is carried out under the same conditions as above. During the vulcanization process, the volume ratio of hydrogen to oil is 700, DMDS is used as the vulcanizing agent, and the addition amount is 0.4% (calculated based on the mass of heavy fraction of coal tar). The preheating temperature of the material after vulcanization is 380°C. The reaction conditions and results of the suspension be...

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Abstract

The invention belongs to the technical field of coal chemical industry, and provides a coal tar heavy fraction suspension-bed hydrocracking method. The method comprises the following steps: mixing raw materials of coal tar heavy fractions with a catalyst and a vulcanizing agent to form a uniform mixed material; vulcanizing the catalyst in the mixed material under the action of hydrogen; preheating the vulcanized mixed material, and then allowing the preheated material to enter a suspension-bed reactor for hydrocracking reaction; and fractionating the product from the suspension-bed reactor to finally obtain gaseous hydrocarbon, gasoline fractions, diesel fractions and tail oil. In the invention, by directly adopting the hydrocracking method with a coal tar heavy fraction suspension bed and a system thereof, the coal tar heavy fractions can keep light weight, and the yield of the fuel oil product hydrogenated by coal tar can be effectively increased; and the suspension-bed hydrogenation reactor has simple structure without a bed layer, thus causing no phenomena such as blockage, increased pressure drop, overtemperature and the like occurred on the reaction bed layer, and the reactor further has the characteristics of great operation flexibility, long operation cycle, being safe and stable, easy control and the like.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a method and a system for hydrocracking of heavy fractions of coal tar in a suspended bed. Background technique [0002] In the process of coal tar processing, the fraction above 350°C in coal tar is generally called the heavy fraction. The heavy fraction of coal tar is mainly composed of aromatic hydrocarbons, colloids, asphaltenes and impurities, and most of them are aromatic compounds with three rings and four rings or more, with a density greater than 1.0g / cm 3 , in which nitrogen content, oxygen content and impurity content are all high. As early as 1938, Germany carried out the industrial production of suspended bed hydrocracking with lignite tar heavy fraction (≥325°C fraction) as raw material, using Fe(OH) 2 —Semi-coke is used as a catalyst, the operating pressure is 30MPa, and the reaction temperature is 465-470°C. In 1959, Fushun No. 3 Pet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/02
Inventor 张秋民马宝岐关珺何德民
Owner DALIAN UNIV OF TECH
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