Passivation method of sulfuration type hydrocracking catalyst

Abstract

The present invention relates to a passivation method of a vulcanization type hydrocracking catalyst , which comprises the steps of: loading a sulfur-containing compound and a nitrogen-containing compound onto a vulcanization type hydrocracking catalyst, and carrying out passivation treatment. Due to the loading, the nitrogen content of the sulfuration type hydrocracking catalyst before passivation treatment is 0.1-5wt% in terms of element, and the sulfur content of the sulfuration type hydrocracking catalyst before passivation treatment is 0.1-5wt% in terms of element. The passivating treatment conditions are as follows: the temperature is 10-120 DEG C, the pressure is 0.01-0.5 MPa, and the time is 0.5-10 hours. The method provided by the invention is good in passivation effect, the catalyst prepared by the method provided by the invention is free of desulfurization reaction during startup, the reaction activity is high, and the startup time of a hydrogenation device is shortened.

Description

technical field [0001] The invention relates to an external passivation method of sulfurized hydrocracking catalyst and a hydrocracking catalyst prepared by the method. Background technique [0002] Hydrocracking technology is an effective means of converting heavy distillate oil into light clean products, therefore, the number of hydroprocessing units in major refineries is also increasing. Hydrocracking technology uses dual-functional catalysts, including cracking function and hydrogenation function. The cracking function is usually provided by molecular sieves with acidic sites, and the hydrogenation function mainly comes from active metals, including Co and / or Ni of group VIII, VIB Mo and / or W of the group. The hydrogenation catalyst has high hydrogenation performance only when the metal is converted into a sulfurized state. Therefore, in order to optimize the hydrogenation performance of the catalyst, the catalyst needs to be sulfurized before use. At present, the sul...

AI Technical Summary

Problems solved by technology

However, anhydrous liquid ammonia is an irritating and toxic liquid, which is flammable and explosive. It is dangerous to use anhydrous liquid ammonia in industry. If it leaks, it will cause great harm to the environment and people. The concept of safety, health and environmental protection

[0005] CN107446616A discloses a method of loading low-molecular nitrogen compounds on conventional hydrocracking catalysts or introducing low-molecular nitrogen compounds during the catalyst kneading molding process to alleviate the risk of overheating during the start-up process of the hydrocracking unit, but the catalyst is in Vulcanization treatment is also required during the start-up process, which will cause some nitrides to react with sulfides during the vulcanization process or desorb in advance as the vulcanization temperature increases, and there is no subsequent ammonia injection process, resulting in molecular sieve passivation process Unstable, the passivation effect cannot be guaranteed, and there is still a certain risk of overheating

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