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Method for removing polycyclic aromatic hydrocarbons from diesel oil distillate

A technology for polycyclic aromatic hydrocarbons and fractions, which is applied in the field of removing polycyclic aromatic hydrocarbons in diesel fractions, can solve problems such as poor selectivity of monocyclic aromatic hydrocarbons, and achieve the effects of improving activity and stability, preventing aggregation and improving activity.

Active Publication Date: 2018-10-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the poor selectivity of single-ring aromatics in the conventional hydrorefining process of high-aromatic diesel feedstock

Method used

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  • Method for removing polycyclic aromatic hydrocarbons from diesel oil distillate
  • Method for removing polycyclic aromatic hydrocarbons from diesel oil distillate
  • Method for removing polycyclic aromatic hydrocarbons from diesel oil distillate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] use figure 1 The flow shown is for feed oil D. The raw material oil D is cut into a light diesel oil fraction and a heavy diesel oil fraction, and the cut point is 240°C. The heavy diesel oil fraction is mixed with hydrogen and enters the first reaction zone and the second reaction zone in turn, and reacts in contact with the hydrotreating catalyst A, and the second The outlet of the reaction zone is separated to obtain a hydrogenated heavy diesel fraction, and the hydrogenated heavy diesel fraction is mixed with the light diesel fraction to obtain a whole fraction product.

[0086] The hydrogenation reaction conditions of the two reaction zones and the properties of the whole cut product are as shown in Table 2. As can be seen from Table 2, the saturation rate of polycyclic aromatic hydrocarbons in the whole cut product is 86.89%, and the saturation rate of total aromatic hydrocarbons is 10.58%. The selectivity of ring aromatics is 81.73%.

[0087] Compared with Com...

Embodiment 2

[0089] use figure 1 The process shown in the process is to process the raw material oil D, cut the raw material oil D into light diesel oil fraction and heavy diesel oil fraction, the cutting point is 240°C, the heavy diesel oil fraction is mixed with hydrogen and enters the first reaction zone and the second reaction zone in sequence, and is mixed with the added oil The hydrofining catalyst A is contacted for reaction, and the outlet of the second reaction zone is separated to obtain a hydrogenated heavy diesel fraction, and the hydrogenated heavy diesel fraction is mixed with the light diesel fraction to obtain a whole fraction product.

[0090] The hydrogenation reaction conditions of the two reaction zones and the properties of the whole fraction product are as shown in Table 2. As can be seen from Table 2, the saturation rate of polycyclic aromatic hydrocarbons in the whole fraction product is 87.26%, and the saturation rate of total aromatic hydrocarbons is 10.21%. The ...

Embodiment 3

[0092] use figure 1 The flow shown is for feed oil D. The raw material oil D is cut into light diesel oil fraction and heavy diesel oil fraction, the cutting point is 250°C, the heavy diesel oil fraction is mixed with hydrogen and enters the first reaction zone and the second reaction zone in turn, and reacts with the hydrotreating catalyst C, the second The outlet stream of the second reaction zone is separated to obtain a hydrogenated heavy diesel fraction, and the hydrogenated heavy diesel fraction is mixed with the light diesel fraction to obtain a whole fraction product.

[0093] The hydrogenation reaction conditions of the two reaction zones and the properties of the whole fraction product are as shown in Table 2. As can be seen from Table 2, the saturation rate of polycyclic aromatic hydrocarbons in the whole fraction product is 85.52%, and the saturation rate of total aromatic hydrocarbons is 10.65%. The selectivity of ring aromatics is 81.31%.

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Abstract

The invention relates to a method for removing polycyclic aromatic hydrocarbons from a diesel oil distillate. The method comprises that a diesel oil raw material oil is cut into a light diesel oil distillate and a heavy diesel oil distillate; the heavy diesel oil distillate is mixed with hydrogen, the mixture contacts a hydrorefining catalyst in a first reaction zone, and hydrodesulfurization, hydrodenitrogenation and selective hydrodearomatization are performed under hydrogenation reaction conditions; the effluent of the first reaction zone enters a second reaction zone and contacts a hydrorefining catalyst, and hydrodesulfurization, hydrodenitrogenation and selective hydrodearomatization are further performed under hydrogenation reaction conditions; the effluent of the second reaction zone is separated to obtain a hydrogenated heavy diesel oil distillate and a gas stream; and the hydrogenated heavy diesel oil distillate and the light diesel oil distillate are mixed to obtain the complete-distillate product, wherein the saturation rate of the polycyclic aromatic hydrocarbon in the complete-distillate product is 85-90% and the selectivity of the monocyclic aromatic hydrocarbon is 80-85% based on the diesel oil raw material oil. According to the present invention, with the method, the high-quality raw material is provided for the catalytic cracking or hydrocracking production ofhigh-octane number gasoline or BTX components while the hydrogen consumption of the hydrogenation process is reduced, and the process economy is easily improved.

Description

technical field [0001] The invention relates to a method for refining hydrocarbon oil in the presence of hydrogen, more specifically, a method for removing polycyclic aromatic hydrocarbons in diesel fractions. Background technique [0002] Catalytic cracking diesel has a relatively high proportion in my country's diesel products, accounting for about 1 / 3 of commercial diesel. As crude oil becomes worse and heavier, the quality of FCC diesel fractions is deteriorating day by day, mainly manifested by high content of sulfur, nitrogen and aromatics, low cetane number and poor stability. In recent years, with the wide application of high-severity catalytic cracking technology such as catalytic cracking technology (MIP) that produces more isoparaffins, the content of aromatics, especially polycyclic aromatics, in MIP catalytic diesel has further increased, and the cetane number has further decreased . With the continuous enhancement of environmental protection awareness, the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G45/02C10G45/08
CPCC10G45/02C10G45/08C10G2300/201C10G2400/04
Inventor 习远兵鞠雪艳王哲戴立顺张乐李明丰杨平李善清
Owner CHINA PETROLEUM & CHEM CORP
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