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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

Active Publication Date: 2022-03-04
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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  • Methods of Improving the Operational Safety of Hydrocracking Units
  • Methods of Improving the Operational Safety of Hydrocracking Units
  • Methods of Improving the Operational Safety of Hydrocracking Units

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] When the reaction temperature of the first bed of hydrocracking catalyst is 396°C, and the difference between the outlet temperature and the inlet temperature T1 of the first catalyst bed is 2°C, the nitrogen weight content of the catalyst in the first catalyst bed is 0.18%, Cool down to 325°C and feed refined oil with a nitrogen content of 495ppm. 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 ~40ppm, and then first raise the reaction temperature to 385°C , adjust the temperature, control the conversion rate to be constant at 35%, and stabilize for 48 hours; finally adjust the process conditions to enter normal production, and the controlled conversion depth is the same as that of Comparative Example 1.

Embodiment 2

[0055] When the reaction temperature of the first bed of hydrocracking catalyst is 397°C, and the difference between the outlet temperature and the inlet temperature T1 of the first catalyst bed is 3°C, the nitrogen content of the catalyst in the first catalyst bed is 0.16%. Feed refined oil with a nitrogen content of 320ppm to 332°C, and 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 ~40ppm, and then first increase the reaction temperature to 385°C , adjust the temperature, control the conversion rate to be constant at 35%, and stabilize for 24 hours; finally adjust the process conditions to enter normal production, and the controlled conversion depth is the same as that of Comparative Example 2.

Embodiment 3

[0057] When the reaction temperature of the first bed of hydrocracking catalyst is 397°C, and the difference between the outlet temperature and the inlet temperature T1 of the first catalyst bed is 1°C, the nitrogen content of the catalyst in the first catalyst bed is 0.28%, and the temperature is lowered Feed refined oil with a nitrogen content of 421ppm to 328°C. After the nitrogen content of the liquid phase effluent from the cracking section is constant at 80ppm, feed hydrogenated refined oil with a nitrogen content of ~40ppm, and then first increase the reaction temperature to 385°C. Adjust the temperature, control the conversion rate to be constant at 38%, and stabilize for 48 hours; finally adjust the process conditions to enter normal production, and the controlled conversion depth is the same as that of Comparative Example 1.

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/90B01J29/08C10G65/00
CPCC10G65/00
Inventor 王仲义崔哲曹正凯唐兆吉孙士可
Owner CHINA PETROLEUM & CHEM CORP
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