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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

Active Publication Date: 2020-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method solves the problem that the activity of some hydrocracking catalysts is damaged due to frequent start-up and shutdown, which affects the mismatch of reaction temperature between different catalyst beds in the reactor.

Method used

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  • Method for improving stable operation of hydrocracking unit
  • Method for improving stable operation of hydrocracking unit
  • Method for improving stable operation of hydrocracking unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] When the reaction temperature of the first bed of hydrocracking catalyst is 366°C, and the temperature difference T1 between the inlet and outlet of the first catalyst bed is 5°C, the nitrogen weight content of the catalyst in the first catalyst bed is 0.3%, Cool down to 310°C and feed refined oil with a nitrogen content of 450ppm. After the nitrogen content of the liquid phase effluent from the cracking section is constant at 50ppm, feed hydrogenated refined oil with a nitrogen content of ~10ppm, and then first raise the reaction temperature to 355°C , adjust the temperature, control the conversion rate to be constant at 35%, and stabilize for 48 hours; continue to adjust the reaction temperature, control the conversion rate to be constant at 50%, and stabilize for 48 hours; continue to adjust the reaction temperature, control the conversion rate to be constant at 55%, and stabilize for 48 hours Continue to adjust the reaction temperature, control the conversion rate to...

Embodiment 2

[0055] When the reaction temperature of the first bed of hydrocracking catalyst is 367°C, and the temperature difference T1 between the inlet and outlet of the first catalyst bed is 6°C, the nitrogen content of the catalyst in the first catalyst bed is 0.29%, and the temperature is lowered Feed refined oil with a nitrogen content of 310ppm to 317°C. After the nitrogen content of the liquid phase effluent from the cracking section is constant at 50ppm, feed hydrogenated refined oil with a nitrogen content of ~10ppm, and then first raise the reaction temperature to 355°C , adjust the temperature, control the conversion rate to be constant at 35%, and stabilize for 24 hours; continue to adjust the reaction temperature, control the conversion rate to be constant at 45%, and stabilize for 48 hours; continue to adjust the reaction temperature, control the conversion rate to be constant at 55%, and stabilize for 48 hours Continue to adjust the reaction temperature, control the convers...

Embodiment 3

[0057] When the reaction temperature of the first bed of hydrocracking catalyst is 367°C, and the temperature difference T1 between the inlet and outlet of the first catalyst bed is 4°C, the nitrogen content of the catalyst in the first catalyst bed is 0.35%, and the temperature is lowered Feed refined oil with a nitrogen content of 395ppm to 313°C. After the nitrogen content of the liquid phase effluent from the cracking section is constant at 80ppm, feed hydrotreated refined oil with a nitrogen content of ~10ppm, and then first increase the reaction temperature to 355°C. Adjust the temperature, control the conversion rate to be constant at 35%, and stabilize for 48 hours; continue to adjust the reaction temperature, control the conversion rate to be constant at 50%, and stabilize for 24 hours; continue to adjust the reaction temperature, control the conversion rate to be constant at 55%, and stabilize for 24 hours; Continue to adjust the reaction temperature, control the conv...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G65/00
CPCC10G65/00
Inventor 曹正凯王仲义崔哲唐兆吉
Owner CHINA PETROLEUM & CHEM CORP
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