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Preparation method for start-up 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 oil, etc., to achieve the effect of solving the heat of concentrated decomposition, high practicability and reducing workload

Active Publication Date: 2021-01-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Aiming at 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 method for preparation for start-up of a hydrocracking unit, mainly for the hydrocracking process

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  • Preparation method for start-up of hydrocracking unit
  • Preparation method for start-up of hydrocracking unit
  • Preparation method for start-up of 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. 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 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 110°C at a rate of ~6°C / h for 9 hours;

[0049] (4) Continue to raise the catalyst bed temperature to 132°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 cat...

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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 large-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 starting a hydrocracking unit, in particular to a hydrocracking airtight method for reducing 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 application shows that most of the active meta...

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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