Startup passivation method of hydrocracking catalyst

Abstract

The invention discloses a startup passivation method of a hydrocracking catalyst. The method includes: after the end of vulcanization, lowering the inlet temperature of a refining reactor and a cracking reactor to 150-205DEG C; introducing high-nitrogen naphtha into the refining reactor, and leaving the refined effluent to enter a separation system; raising the inlet temperature of the refining reactor, and when the refining section has high and stable temperature rise, making the refined effluent enter the cracking reactor after heat exchange, and maintaining a constant cracking reactor inlet temperature; after ammonia penetrates the cracking reactor, adjusting the refining reactor inlet temperature and heat exchange operations, and slowly raising the inlet temperature of the cracking reactor till 300-320DEG C, thus finishing passivation. The method disclosed in the invention introduces the high-nitrogen naphtha into the refining section in the catalyst passivation stage, and adopts the ammonia gas generated by hydrogenation of the high-nitrogen naphtha as a passivant to passivate a cracking agent, thus reaching the purpose of using no passivant. The method provided in the invention is applicable to the principle-based startup passivation process of various hydrocracking catalysts.

Description

technical field [0001] The invention relates to a start-up passivation method of a hydrocracking catalyst, which mainly uses light oil products containing relatively high nitrogen content as a passivation agent to passivate the hydrocracking agent, so as to achieve the purpose of not using a passivation agent , The principle of starting passivation process applicable to various hydrocracking catalysts. Background technique [0002] The hydrocracking process is under the action of hydrogen, high temperature, high pressure and catalysts to hydrodesulfurize, hydrodenitrogenate, polycyclic aromatic hydrocarbons, hydrosaturation and ring-opening cracking of heavy distillate oils (VGO, CGO, DAO). The process of conversion into target products such as light oil and middle distillates. The hydrocracking catalysts currently produced in domestic industry are basically oxidative. New catalysts or regenerated catalysts produced in industry contain active metal components (Mo, Ni, Co, ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems existing in the existing start-up technology, the present invention provides a start-up method for passivating the vulcanized hydrocracking agent by using a light oil product containing relatively high nitrogen content as a passivating agent. The ammonia gas generated by the hydrogen denitrification reaction is adsorbed on the cracking agent, the passivation process is completed and the start-up is successful, which can completely avoid the consumption of the passivation agent during the start-up process, which not only saves energy, but also reduces the impact of the passivation agent on the environment. Pollution and harm to the human body

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