A start-up method of a hydrocracking unit containing a catalyst with a second type of active center

Abstract

The present invention discloses a startup sulfurization method of a hydrocracking apparatus. According to the present invention, with the grading use of the ex-situ presulfided catalyst, the hydrogenation catalyst containing the second active center is pre-protected with the hydrogen sulfide gas produced in the heating process while a certain auxiliary gas can be selectively injected according to different preparation methods of the second active center catalysts, such that the wet startup is converted into the dry startup; and the activity of the catalyst can be improved with the method of the present invention, and the method is suitable for the sulfurization startup process of various hydrogenation catalysts containing the second active center.

Description

technical field [0001] The invention relates to a start-up vulcanization method of a hydrogenation catalyst, in particular to a start-up method of a hydrocracking unit containing a type-two active center catalyst. Background technique [0002] At present, due to the increasingly heavy crude oil in the world and the strict requirements of environmental protection regulations, the quality of raw materials processed by hydrogenation devices is deteriorating year by year. Various impurities contained in raw materials, including metals, The content of reactants such as sulfur and nitrogen is on the rise. In this harsh environment, catalyst developers in various countries have regarded the renewal and progress of catalyst activity as a major challenge they face. [0003] As far as hydrofining (processing) catalysts are concerned, the contributions made by hydrogenation people are obvious to all. Through continuous efforts and attempts, many new catalyst production concepts and met...

AI Technical Summary

Problems solved by technology

[0006] 1. Various compounds in the starting oil will cause coking of the catalyst;

[0007] 2. The end point of vulcanization is advanced, the degree of strengthening in the catalyst is weakened, and the degree of initial vulcanization is insufficient;

[0008] 3. The three phases of gas, liquid and solid exist at the same time, which affects the distribution of logistics and causes uneven sulfuration of the catalyst;

[0009] 4. The vulcanization and passivation process is carried out at the same time, and the consumption of reagents increases;

[0010] 5. High activity cracking agent and liquid oil exist at the same time, and the risk of over-temperature becomes greater

[0011] To sum up, the adjusted and changed start-up mode in order to adapt to the change of catalyst type will cause increased material consumption, greater operational risk, and reduced catalyst activity. Compared with the catalyst activity improved by adding additives, which is more important? still hard to compare

[0012] Chinese patents CN103773436A and CN102311766A introduce the start-up method of hydrogenation catalysts with second-class active centers. Although more second-class active centers can be generated under this method, liquid components need to be introduced during the start-up process, which still belongs to the wet start-up mode. , cannot completely solve the inherent drawbacks of the liquid phase vulcanization process and the damage to the catalyst activity

[0014] Chinese patent CN101003749A introduces a hydrocracking start-up method that does not require the use of vulcanizing agents in the whole process. Although the operation is simple and the process is easy, it is difficult to ensure the oxidation state and the cracking activity and activity stability of the elemental metal catalyst.

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