Start-up preparation method of hydrocracking unit

A technology of hydrocracking and preparation method, which is applied in the direction of start-up of hydroprocessing operation, petroleum industry, and treatment of hydrocarbon oil, 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] In view of the problems existing in the gas-tight start-up process of using the second type of active center external pres...

Method used

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

Examples

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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. Preparations for start of work include:

[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 100°C for 7 hours; the heating rate is 20°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 ~7°C / h for 7 hours;

[0049] (4) Continue to raise the catalyst bed temperature to 133°C at a rate of ~7°C / h, and keep the temperature constant;

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

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Abstract

The invention discloses a start-up preparation method of a hydrocracking unit. The method is used for the start-up process of an ex-situ presulfurization type hydrotreating catalyst containing a sulfinyl compound and a small pore volume hydrocracking catalyst. Particularly, in the airtight process, a constant-pressure heating section, a constant-pressure constant-temperature section and a constant-pressure heating section are arranged, so heat generated by hydrogenolysis of sulfide and/or auxiliaries in the airtight starting 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. According to the method, obstacles in the industrial application process ofthe combined catalyst are thoroughly solved, the use activity of the catalyst is improved, meanwhile, the environmental protection hidden danger of leakage of a vulcanizing agent is eliminated, and the method has a good application prospect.

Description

technical field [0001] The invention relates to a preparation method for the start-up of a hydrocracking unit, in particular to a method for preparation for the start-up of a hydrocracking unit which reduces the risk of over-temperature 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 appl...

Claims

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Application Information

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