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...

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Problems solved by technology

[0008] Passivators such as anhydrous liquid ammonia injected outside the device can make the start-up process smooth and safe, but it needs to be transported by a pressure pump, which not only increases the one-time investment of the device, but also wastes the floor area. Equipment that is intermittently opened often breaks down and affects the progress of the start-up. At the same time, the danger of anhydrous liquid ammonia has been described above, and the difficulty of its control is self-evident; If the agent is injected, the stability and safety of the start-up process will inevitably be reduced, and the vulcanization process will also be shortened or terminated, which will have a great impact on the activity of the catalyst, which may affect the long-term stable operation of the catalyst. In addition, it will also be greatly affected. prolongs the time for the catalyst to enter a steady state

[0009] Both CN101492613A and CN101492607A disclose the start-up method of the hydrocracking process, which has certain safety and convenience, but still belongs to the method of forced injection of ammonia outside the device to inject a certain passivating agent into the reaction system to inhibit the activity of the cracking agent. There are bound to be disadvantages of injecting ammonia in the above-mentioned prior art, which will bring certain hidden dangers and harm

However, there are still other liquid components that are additionally introduced, and the control control is difficult to achieve, and the start-up process takes a long time

[0013] CN102284299A and CN1602999A relate to a method of hydrogenation catalyst presulfurization outside the hydrogenation reactor-activation in the hydrogenation reactor, which completes the deactivation process of the sulfidation agent of the catalyst under specific working condi

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