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A method for improving smooth operation of hydrocracking unit

A hydrocracking, stable operation technology, applied in the direction of chemical instruments and methods, hydroprocessing technology, molecular sieve catalysts, etc., can solve the problems of hydrocracking catalyst activity damage, reaction temperature mismatch, etc., and achieve good passivation effect , suitable process conditions, avoiding investment and the effect of transformation work

Active Publication Date: 2022-04-08
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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  • A method for improving smooth operation of hydrocracking unit
  • A method for improving smooth operation of hydrocracking unit
  • A method for improving smooth 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 the smooth operation of a hydrocracking unit. The hydrocracking contains at least two hydrocracking catalyst beds, and when the weight percentage of nitrogen in the hydrocracking catalyst in the first hydrocracking catalyst bed is 0.25-0.5%, the temperature is lowered to 200-340° C. Switch the hydrocracking feed oil with a nitrogen content of 300-500 ppm, switch the hydro-refined oil with a nitrogen content of less than 10 ppm when the nitrogen content in the hydrocracking effluent is constant at 50-80 ppm, and adjust the reaction in the hydrocracking section The temperature makes the light oil mass yield of <360℃ constant at 65~70%, and the constant total time is 24~48 hours, and then adjusted to the hydrocracking reaction conditions to carry out the hydrocracking reaction. The method solves the problem that the activity of part of the hydrocracking catalyst is damaged due to frequent start-up and shutdown, thereby affecting the mismatch of reaction temperatures between different catalyst beds in the reactor.

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 Patents(China)
IPC IPC(8): B01J29/90B01J29/08C10G65/00
CPCC10G65/00
Inventor 曹正凯王仲义崔哲唐兆吉
Owner CHINA PETROLEUM & CHEM CORP
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