Start-up activation preparation method of hydrocracking unit

A technology for hydrocracking and preparation methods, which is used in the start-up of hydrotreating operations, the petroleum industry, and the treatment of hydrocarbon oils, etc.

Active Publication Date: 2020-07-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Aiming at the existing problems in the gas-tight start-up process of the pre-sulfurized catalyst outside the second type of active cen

Method used

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  • Start-up activation preparation method of hydrocracking unit
  • Start-up activation preparation method of hydrocracking unit
  • Start-up activation preparation method of hydrocracking unit

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Experimental program
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Embodiment 1

[0045] A hydrogenation unit is equipped with an external presulfurization type II active center hydrocracking supporting catalyst. The properties of the catalyst are shown in Table 2. The system design pressure is 16MPa. The start-up process includes:

[0046] (1) Introduce nitrogen into the reaction system, and perform low-pressure airtightness at 1.0Pa, 3.0MPa, and 5.0MPa in sequence;

[0047] (2) After the airtightness is qualified, reduce the system pressure to 3.7MPa, introduce hydrogen to keep the pressure constant at 4.6MPa, and then raise the temperature of the catalyst bed to 90°C for 9 hours; the heating rate is 15°C / h;

[0048] (3) Keep the pressure constant, and continue to raise the temperature of the catalyst bed to 120°C at a rate of ~6°C / h for 9 hours;

[0049] (4) Continue to raise the catalyst bed temperature to 150°C at a rate of ~6°C / h, and keep the temperature constant;

[0050] (5) When the reactor wall temperature is higher than 120°C, the catalyst bed...

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Abstract

The invention discloses a start-up preparation method of a hydrocracking unit. According to the method, for the start-up process, particularly the airtight process of an ex-situ prevulcanization typehydrotreating catalyst containing a carboxyl compound and a large-pore-volume hydrocracking catalyst, a constant-pressure heating section, a constant-pressure constant-temperature section and a constant-pressure heating section are arranged, so that heat generated by hydrogenolysis of sulfide and/or auxiliaries in the airtight start-up process is reasonably distributed, controlled and stably released, the phenomenon of centralized heat release is avoided, and the risks of over-temperature and temperature runaway are reduced. By the method, obstacles in the industrial application process of thecombined catalysts are thoroughly solved, the use activity of the catalysts is improved, and the environmental protection hidden danger of leakage of a vulcanizing agent is eliminated. The method hasa good application prospect.

Description

technical field [0001] The invention relates to a hydrocracking start-up preparation method, in particular to a hydrocracking airtight method for reducing the risk of overtemperature during the airtight process of an external presulfurized type II active center catalyst. Background technique [0002] The hydrogenation process is the process of hydrogenation, high temperature conditions and the action of catalysts to make raw oil hydrodesulfurization, hydrodenitrogenation, polycyclic aromatic hydrocarbons hydrogenation saturation, etc., so as to convert it into clean oil or intermediate blends. The hydrogenation catalysts currently produced in the domestic industry are basically oxidation-type. New catalysts or regenerated catalysts produced in industry contain active metal components (Mo, Ni, Co, W) in the oxidation state (MoO 3 , NiO, CoO, WO 3 ) exists in the form of The practice of basic research and industrial application shows that most of the active metal components...

Claims

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Application Information

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IPC IPC(8): C10G49/24
CPCC10G49/24C10G2300/4006C10G2300/4012C10G2300/703
Inventor 王仲义崔哲彭冲唐兆吉曹正凯孙士可
Owner CHINA PETROLEUM & CHEM CORP
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