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Method for maximizing production of aromatic hydrocarbon by catalyzing diesel oil hydro-conversion

A technology for catalytic diesel and hydrogenation conversion, which is applied in the fields of hydrotreating process, petroleum industry, and hydrocarbon oil treatment. It can solve the problems of long initial adjustment period and low octane number of gasoline fraction, so as to prolong the operation period and cracking reaction Decrease, increase the effect of selectivity

Pending Publication Date: 2020-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
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Problems solved by technology

The invention balances the initial activity of the catalyst by grading hydrogenation catalysts with different degrees of sulfidation, and solves the problems of long initial adjustment period and long-term low octane number of the main target product gasoline fraction in the technology application process

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  • Method for maximizing production of aromatic hydrocarbon by catalyzing diesel oil hydro-conversion
  • Method for maximizing production of aromatic hydrocarbon by catalyzing diesel oil hydro-conversion
  • Method for maximizing production of aromatic hydrocarbon by catalyzing diesel oil hydro-conversion

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Embodiment 1～4

[0036] Embodiment 1~4 all adopts the method of the present invention, figure 1 The process flow shown. High-aromatic catalytic diesel is heated by a heating furnace and mixed with circulating hydrogen into the hydrofining reaction zone for reaction. The hydrofinishing reaction zone is equipped with four catalyst beds that are graded and filled with four kinds of FF-36 hydrogenation catalysts with different degrees of sulfidation. Examples 1-2 The degree of sulfidation of the catalyst in the first bed is ~80%, and the degrees of sulfidation of the catalysts in the second, third and fourth beds decrease by 10% one by one. Example 3 The degree of sulfurization of the catalyst in the first bed layer is ~75%, and the degrees of sulfurization of the catalysts in the second bed layer, the third bed layer, and the fourth bed layer are decreased by 10% one by one. Example 4 The degree of sulfurization of the catalyst in the first bed layer is ~70%, and the degrees of sulfurization of ...

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Abstract

The invention discloses a method for maximizing production of aromatic hydrocarbon by catalyzing diesel oil hydro-conversion, comprising the following steps: (1) high aromatic hydrocarbon catalytic diesel oil and recycle hydrogen are mixed and enter a hydrofining reaction zone for reaction, the hydrofining reaction zone is provided with at least two catalyst beds, and the vulcanization degree of the catalyst in the material flow direction is in a decreasing trend; (2) the generated oil obtained in the step (1) enters a hydrocracking reaction zone to be in contact with at least two sulfurized hydrocracking catalysts to carry out ring-opening conversion reaction of polycyclic aromatic hydrocarbon; (3) the generated oil obtained in the step (2) passes through a separation system to obtain gas, gasoline and diesel oil fractions, and the diesel oil fractions are completely recycled back to the hydrofining reaction zone; and (4) naphtha obtained in the step (3) enters an aromatic hydrocarbonextraction device, and a BTX product is obtained through solvent extraction. Hydrogenation catalysts with different vulcanization degrees are used through grading, the initial activity of the catalyst is balanced, and the problems that the initial adjustment period is long in the technical application process and the octane number of a main target product gasoline fraction is low for a long timeare solved.

Description

technical field [0001] The invention relates to the field of petroleum refining, in particular to a method for maximum production of aromatics through catalytic diesel hydrogenation conversion. Background technique [0002] Catalytic cracking is currently the most important secondary processing process in the petroleum refining industry, and it is also the core process of lightening heavy oil. As the world's oil becomes increasingly heavy, the processing capacity of the FCC unit is also continuously improved. Using various heavy oils as raw materials, high-octane gasoline, the main product, is obtained through catalytic cracking reactions, and a large amount of sulfur, nitrogen, and aromatics are produced at the same time. Catalytic diesel oil with high content, low cetane number or cetane index, and extremely poor stability. Moreover, the requirements of environmental protection regulations are becoming more and more stringent, and the indicators of diesel products are gra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/04
CPCC10G67/04C10G2300/1037
Inventor 彭冲曾榕辉曹正凯孙士可吴子明
Owner CHINA PETROLEUM & CHEM CORP
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