Method for improving stable operation of hydrocracking unit

A hydrocracking and stable operation technology, which is applied in the fields of hydroprocessing process, petroleum industry, and hydrocarbon oil treatment, can solve the problems of hydrocracking catalyst activity damage, reaction temperature mismatch, etc., and achieve good passivation effect, The effects of suitable process conditions, reducing operational fluctuations and operational risks
CN111100688AActive Publication Date: 2020-05-05CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2020-05-05

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Abstract

The invention discloses a method for improving stable operation of a hydrocracking unit. The hydrocracking unit at least comprises two hydrocracking catalyst beds. The method comprises the following steps: cooling to 200-340 DEG C and switching the hydrocracking feed oil with the nitrogen content of 300 to 500 ppm when the weight percentage content of nitrogen in the hydrocracking catalyst in thefirst hydrocracking catalyst bed is 0.25-0.5%; switching the hydrofined oil with the nitrogen content of less than 10ppm when the nitrogen content in the hydrocracking effluent is constant at 50-80ppm; simultaneously adjusting the reaction temperature of the hydrocracking section until the mass yield of the light oil of less than 360 DEG C is finally kept constant at 65-70% and the total constanttime is 24-48 hours; and then adjusting to the hydrocracking reaction conditions to carry out a hydrocracking reaction. By the method, the problem that the activity of part of the hydrocracking catalyst is damaged due to frequent startup and shutdown and the mismatching of reaction temperatures among different catalyst beds in the reactor is influenced is solved.
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Description

technical field

[0001] The invention relates to a method for improving the stable operation of a hydrocracking unit, in particular to a method for improving activity matching between beds of a hydrocracking catalyst 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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