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Methods of Improving the Smooth Operation of Hydrocracking Units

A hydrocracking, stable operation 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 and simple process

Active Publication Date: 2022-03-08
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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  • Methods of Improving the Smooth Operation of Hydrocracking Units
  • Methods of Improving the Smooth Operation of Hydrocracking Units
  • Methods of Improving the Smooth Operation of Hydrocracking Units

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] When the reaction temperature of the hydrocracking catalyst first bed is 376 ° C, and when the exit temperature of the first catalyst bed and the inlet temperature difference T1 are 4 ° C, the nitrogen weight content of the catalyst in the first catalyst bed is 0.25%, Cooling to 315 ° C refined oils in a nitrogen content of 460 ppm, and the nitrogen content of the liquid phase fluid phase fluid phase is constant to 50 ppm, and the nitrogen content is from ~ 20 ppm hydrotherminal oil, and then first improve the reaction temperature to 365 ° C Temperature adjustment, the control conversion rate is constant to 35%, stable for 48 hours; continue to adjust the reaction temperature, the control conversion rate is constant to 50%, stable for 48 hours; continue to adjust the reaction temperature, the control conversion rate is constant to 55%, stable 48 hours Finally, the process conditions entered normal production, and the depth of the control was the same as Comparative Example ...

Embodiment 2

[0055] When the reaction temperature of the hydrocracking catalyst is 377 ° C, and when the outlet temperature of the first catalyst bed and the inlet temperature difference T1 are 5 ° C, the nitrogen content of the catalyst in the first catalyst bed is 0.24%, cooling. To 322 ° C 320 ppm of refined oils, the nitrogen content of the liquid phase fluid phase to be cracked is constant to 50 ppm, and the nitrogen content is from ~ 20 ppm hydrotherminal oil, and then first improve the reaction temperature to 365 ° C Temperature adjustment, constant control conversion rate is 35%, stable 24 hours; continue to adjust the reaction temperature, control conversion rate is 45%, stable for 48 hours; continue to adjust the reaction temperature, control conversion rate is 55%, stable 48 hours Finally, the process conditions entered normal production, and the transformation depth of its control was the same as Comparative Example 2.

Embodiment 3

[0057] When the reaction temperature of the hydrocracking catalyst first bed is 377 ° C, and when the outlet temperature of the first catalyst bed and the inlet temperature difference T1 are 3 ° C, the nitrogen content of the catalyst in the first catalyst bed is 0.30%, cooling. When the nitrogen content of 400 ppm is 318 ° C, the nitrogen content of the liquid phase to be cleaved is constant to 80 ppm, and the nitrogen content of ~ 20 ppm is 3 ppm, and then the reaction temperature is first improved to 365 ° C. Temperature adjustment, the control conversion rate is constant to 35%, stable for 48 hours; continue to adjust the reaction temperature, the control conversion rate is constant to 50%, stable 24 hours; continue to adjust the reaction temperature, the control conversion rate is constant to 55%, stable 24 hours; Finally, the process conditions entered normal production, and the translation depth of its control was the same as Comparative Example 1.

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Abstract

The invention discloses a method for improving the stable operation of a hydrocracking unit. The hydrocracking unit contains at least two hydrocracking catalyst beds. When the nitrogen in the hydrocracking catalyst in the first hydrocracking catalyst bed is When the nitrogen content is 0.2~0.45%, the temperature is lowered to 200~340°C to switch the hydrocracking feed oil with a nitrogen content of 300~500ppm. When the nitrogen content in the hydrocracking effluent is constant at 50~80ppm, switch the nitrogen content to less than 20ppm of hydrorefined oil, while adjusting the reaction temperature of the hydrocracking section so that the mass yield of light oil <360°C is finally constant at 55~60%, and the constant time is 24~48 hours, and then adjusted to the hydrocracking reaction conditions carry out hydrocracking reactions. 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 present invention relates to a method of increasing a smooth operation of hydrocracking apparatus, and in particular to a method of improving the activity of hydrocracking catalyst bed after frequent stopping. Background technique [0002] The hydrocracking process is a hydrogen, high temperature, high pressure conditions, and catalysts, so that the redential oil (VgO, CGO, DAO) hydrodrosion desulfurization, hydrodes, polycyclic aromatic hydrocarbons is saturated, and the ring cracking, The process of transforming the product of light oil and intermediate distillate oil. The hydrocracking catalyst produced in the current domestic industry is basically oxidized. New catalyst or regeneration catalyst produced in industrial production, the active metal components (Mo, Ni, Co, W) thereof are oxidized states (MOO) 3 , NIO, COO, WO 3 The form is present. Practice of basic research and industrial application shows that the active metal component of the hydroge...

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 王仲义崔哲唐兆吉曹正凯彭冲
Owner CHINA PETROLEUM & CHEM CORP
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