Rapid start-up method of hydrocracking catalyst

Abstract

The invention discloses a rapid start-up method of a hydrocracking catalyst. The start-up method comprises the following steps: introducing raw material oil in the vulcanization process, after vulcanization is completed, adjusting a reaction temperature, and when the mass yield of light oil less than 360 DEG C is stabilized at 35-40%, adjusting to a hydrocracking reaction condition to carry out ahydrocracking reaction, wherein the hydrocracking catalyst comprises 0-10% of a molecular sieve by weight, and the molecular sieve comprises, but not limited, a Y type or a USY (Ultra-Stable Y Zeolite) type molecular sieve. The method is simple in start-up and raw material switching process, stable in operation and capable of avoiding consumption of a passivant in the start-up process and potential danger in the ammonia injection process.

Description

technical field

[0001] The invention relates to a rapid start-up method of a hydrocracking catalyst, in particular to a rapid start-up method of a hydrocracking catalyst without ammonia injection passivation. 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 the active metal components of hydrogenation...

Examples

Embodiment 1

[0035] Start the operation according to the start-up process of the conventional hydrocracking unit, control the reactor inlet temperature at 160°C, introduce low-nitrogen oil into the reaction system, raise the reactor inlet temperature to 180°C, and inject vulcanizing agent into the reaction system. After the hydrogen sulfide concentration in the circulating hydrogen reaches 0.1v%, the reactor inlet temperature is increased to 220°C, and the constant temperature sulfuration is carried out for at least 8 hours. Then raise the temperature to 270°C to introduce raw material oil and change it to a one-pass process to continue vulcanization. The temperature rises to 320°C at a rate of 8°C / hour, and the vulcanization ends after 4 hours of constant temperature. Then first raise the reaction temperature to 355° C., adjust the temperature, control the conversion rate to be constant at 35%, and keep it stable for 2 days. After the resurrection process is over, adjust the process condi...

Embodiment 2

[0037] Start the operation according to the start-up process of the conventional hydrocracking unit, control the reactor inlet temperature at 160°C, introduce low-nitrogen oil into the reaction system, raise the reactor inlet temperature to 180°C, and inject vulcanizing agent into the reaction system. After the concentration of hydrogen sulfide in the circulating hydrogen reaches 0.1v%, the inlet temperature of the reactor is raised to 240°C, and the constant temperature sulfuration is carried out for at least 8 hours. Then raise the temperature to 280°C to introduce raw material oil and change it to a one-pass process to continue vulcanization. The temperature rises to 330°C at a rate of 8°C / hour, and the vulcanization ends after 4 hours of constant temperature. Then first increase the reaction temperature to 365°C, adjust the temperature, control the conversion rate to be constant at 35%, and stabilize for 1 day. After the resurrection process is over, adjust the process con...

Embodiment 3

[0039] Start the operation according to the start-up process of the conventional hydrocracking unit, control the reactor inlet temperature at 160°C, introduce low-nitrogen oil into the reaction system, raise the reactor inlet temperature to 180°C, and inject vulcanizing agent into the reaction system. After the hydrogen sulfide concentration in the circulating hydrogen reaches 0.1v%, the reactor inlet temperature is increased to 220°C, and the constant temperature sulfuration is carried out for at least 8 hours. Then raise the temperature to 270°C to introduce raw material oil and change it to a one-pass process to continue vulcanization. The temperature rises to 320°C at a rate of 8°C / hour, and the vulcanization ends after 8 hours of constant temperature. Then first raise the reaction temperature to 360° C., adjust the temperature, control the conversion rate to be constant at 40%, and keep it stable for 2 days. After the resurrection process is over, adjust the process condi...

technical field

[0001] The invention relates to a rapid start-up method of a hydrocracking catalyst, in particular to a rapid start-up method of a hydrocracking catalyst without ammonia injection passivation. 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 the active metal components of hydrogenation...

Examples

Embodiment 1

[0035] Start the operation according to the start-up process of the conventional hydrocracking unit, control the reactor inlet temperature at 160°C, introduce low-nitrogen oil into the reaction system, raise the reactor inlet temperature to 180°C, and inject vulcanizing agent into the reaction system. After the hydrogen sulfide concentration in the circulating hydrogen reaches 0.1v%, the reactor inlet temperature is increased to 220°C, and the constant temperature sulfuration is carried out for at least 8 hours. Then raise the temperature to 270°C to introduce raw material oil and change it to a one-pass process to continue vulcanization. The temperature rises to 320°C at a rate of 8°C / hour, and the vulcanization ends after 4 hours of constant temperature. Then first raise the reaction temperature to 355° C., adjust the temperature, control the conversion rate to be constant at 35%, and keep it stable for 2 days. After the resurrection process is over, adjust the process condi...

Embodiment 2

[0037] Start the operation according to the start-up process of the conventional hydrocracking unit, control the reactor inlet temperature at 160°C, introduce low-nitrogen oil into the reaction system, raise the reactor inlet temperature to 180°C, and inject vulcanizing agent into the reaction system. After the concentration of hydrogen sulfide in the circulating hydrogen reaches 0.1v%, the inlet temperature of the reactor is raised to 240°C, and the constant temperature sulfuration is carried out for at least 8 hours. Then raise the temperature to 280°C to introduce raw material oil and change it to a one-pass process to continue vulcanization. The temperature rises to 330°C at a rate of 8°C / hour, and the vulcanization ends after 4 hours of constant temperature. Then first increase the reaction temperature to 365°C, adjust the temperature, control the conversion rate to be constant at 35%, and stabilize for 1 day. After the resurrection process is over, adjust the process con...

Embodiment 3

[0039] Start the operation according to the start-up process of the conventional hydrocracking unit, control the reactor inlet temperature at 160°C, introduce low-nitrogen oil into the reaction system, raise the reactor inlet temperature to 180°C, and inject vulcanizing agent into the reaction system. After the hydrogen sulfide concentration in the circulating hydrogen reaches 0.1v%, the reactor inlet temperature is increased to 220°C, and the constant temperature sulfuration is carried out for at least 8 hours. Then raise the temperature to 270°C to introduce raw material oil and change it to a one-pass process to continue vulcanization. The temperature rises to 320°C at a rate of 8°C / hour, and the vulcanization ends after 8 hours of constant temperature. Then first raise the reaction temperature to 360° C., adjust the temperature, control the conversion rate to be constant at 40%, and keep it stable for 2 days. After the resurrection process is over, adjust the process condi...

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