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A preparation method for start-up activation of a 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 oil, etc., to achieve the effects of increasing the total consumption time, broadening the scope of application, and reducing workload

Active Publication Date: 2021-02-05
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 presulfurized catalyst, the present invention provides a preparation method for hydrogenation start-up, mainly for the hydrocracking process

Method used

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  • A preparation method for start-up activation of a hydrocracking unit
  • A preparation method for start-up activation of a hydrocracking unit
  • A preparation method for start-up activation of a hydrocracking unit

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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. Start methods 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 130°C at a rate of ~7°C / h for 7 hours;

[0049] (4) Continue to raise the catalyst bed temperature to 150°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 catalyst bed temper...

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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 prevulcanization type hydrotreating catalyst containing a carboxyl 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. The method provided by the invention thoroughly solves the obstacles in theindustrial application process of the combined catalyst, not only improves the use activity of the catalyst, but also eliminates the hidden danger of environmental protection caused by the leakage ofthe vulcanizing agent, and has a very good application prospect.

Description

technical field [0001] The invention relates to a hydrocracking start-up activation preparation method, in particular to a hydrocracking airtight method for reducing the over-temperature risk in 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 compo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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