Methods of Improving the Operational Safety of Hydrocracking Units

A hydrocracking and safety technology, applied in chemical instruments and methods, hydrotreating processes, molecular sieve catalysts, etc., can solve the problems of damaged hydrocracking catalyst activity, mismatched reaction temperature, etc., and achieve good passivation effect. , The effect of suitable process conditions, reducing operating fluctuations and operating risks
CN111100687BActive Publication Date: 2022-03-04CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2022-03-04

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Abstract

The invention discloses a method for improving the operation safety of a hydrocracking unit. The hydrocracking unit contains at least two hydrocracking catalyst beds. When the nitrogen weight in the hydrocracking catalyst in the first hydrocracking catalyst bed is When the percentage content is 0.15~0.35%, cool down to 200~340°C to switch the hydrocracking feed oil with a nitrogen content of 300~500ppm, and switch the nitrogen content when the nitrogen content in the hydrocracking effluent is constant at 50~80ppm For hydrorefined oil less than 40ppm, adjust the reaction temperature of the hydrocracking section so that the mass yield of light oil <360°C is finally constant at 35~40%, and the total constant time is 48~96 hours, and then adjust to hydrocracking Reaction conditions The hydrocracking reaction is carried out. The method solves the problem that the activity of some hydrocracking catalysts is damaged due to frequent start-up and shutdown, thereby affecting the mismatch of reaction temperatures between different catalyst beds in the reactor.
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Description

technical field

[0001] The invention relates to a method for improving the operation safety of a hydrocracking unit, in particular to a method for improving activity matching between beds of hydrocracking catalysts after frequent start-up and shutdown. 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, 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 ...

Claims

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