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Coal tar hydrogenating modified method by two-stage method

A technology of hydrogenation upgrading and coal tar, which is applied in the fields of hydrogenation treatment process, petroleum industry, and hydrocarbon oil treatment, which can solve the problems of cost increase and achieve the effects of reducing content, long service life, and reducing aromatics content

Active Publication Date: 2008-11-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses precious metal catalysts to increase the cost

Method used

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  • Coal tar hydrogenating modified method by two-stage method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of high-temperature coal tar is used as raw material oil, its properties are shown in Table 1, continuous distillation under normal pressure is separated into 365 ° C coal tar heavy fraction, in addition, the < 365 ° C coal tar light fraction is tested Boiling point distillation removes the naphthalene-rich fraction at 210-230°C to obtain a light fraction of coal tar with naphthalene removal <365°C. The basic properties of the above fractions are shown in Table 2.

Embodiment 2

[0043] The naphthalene-removed coal tar light fraction obtained in Example 1 was blended with a catalytic cracking diesel oil A at a mass ratio of 1:3 to obtain a mixed feedstock oil B. The basic properties of the catalytic cracked diesel oil A and the mixed feedstock oil B are shown in Table 3. The raw material oil B is mixed with hydrogen and enters the first hydrogenation reaction zone to contact and react with the hydrofining catalyst E. The reaction effluent enters the second hydrogenation reaction zone after hydrogen sulfide and ammonia are removed in the intermediate flash tower The hydrocracking catalyst G is contacted to react, and the effluent after the reaction is cooled, separated and fractionated to obtain a diesel fraction and a small amount of naphtha fraction. The loading volume ratio of the hydrofinishing catalyst E and the hydrocracking catalyst G is 3:2. The specific reaction conditions are shown in Table 4, and the main product properties are shown in Table ...

Embodiment 3

[0046] The coal tar light fraction obtained in Example 1 was blended with a catalytic cracking diesel oil A at a mass ratio of 1:3 to obtain a mixed feedstock oil C. The basic properties of the catalytic cracked diesel oil A and the mixed feedstock oil C are shown in Table 3. The raw material oil C is mixed with hydrogen and enters the first hydrogenation reaction zone to contact and react with the hydrofining catalyst E. After the hydrogen sulfide and ammonia are removed in the high-pressure stripping tower, the reaction effluent enters the second hydrogenation reaction zone and The hydrocracking catalyst G contacts and reacts, and the loading volume ratio of the hydrofinishing catalyst E and the hydrocracking catalyst G is 1:1. The specific reaction conditions are shown in Table 4, and the main product properties are shown in Table 5.

[0047] It can be seen from Table 5 that the density of the diesel fraction is 0.8466g / cm 3 , the sulfur content is 26 μg / g, the polycyclic ...

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Abstract

The invention discloses a two-stage method coal tar hydro-upgrading method. Coal tar is subject to the atmospheric distillation and / or the reduced pressure distillation and is cut into coal tar light cut and coal tar heavy cut; after the coal tar light cut and optional distillate oil are mixed with hydrogen, the mixture enters a first hydrogeneration reaction zone and performs the contact reaction with hydrorefining catalyst; gas phase impurities of a reaction effluent is removed through an intermediate flash distillation column or a high-pressure stripping tower, and then the reaction effluent enters a second hydrogeneration reaction zone to perform the contact reaction with the hydro-upgrading catalyst or the hydrocracking catalyst; and the obtained reaction effluent is cooled, separated and fractionated to produce diesel fraction and naphtha cut. The invention provides a clean and effective coal tar processing and utilizing method, the coal tar light cut is hydro-upgraded to produce diesel oil for vehicles, the sulfur content of the obtained diesel product is less than 50 mu g / g, the content of polycyclic aromatic hydrocarbon is less than 11 weight percent, and the diesel oil cetane number of the product is improved by not less than 20.

Description

technical field [0001] The present invention pertains to a method of treating coal tar with at least one hydrotreating process and at least one other conversion step. Background technique [0002] With the continuous and high-speed development of social economy, my country's demand for petroleum products is also increasing. However, petroleum is a non-renewable energy source and is facing a crisis of depletion. In contrast, China has relatively abundant coal reserves, so producing liquid fuel from coal has become a basic direction of coal processing and utilization. [0003] In addition, with the rapid growth of the international and domestic steel industry, the coking industry is showing a high growth trend. Therefore, the output of coal tar is increasing, and the clean processing and effective utilization of coal tar are becoming more and more important. At present, the conventional processing method is to cut various fractions with concentrated components through pretre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G69/12
Inventor 张毓莹蒋东红胡志海卫剑辛靖聂红
Owner CHINA PETROLEUM & CHEM CORP
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