Start-up method of a hydrogenation unit containing a second-type active center catalyst

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 the hydrogenation catalyst containing the second active center.

Description

technical field [0001] The invention relates to a hydrogenation catalyst start-up vulcanization method, especially for a hydrocracking unit containing a second-type active center catalyst, mainly by grading and using an external pre-sulfurization catalyst, and utilizing the catalyst produced during the heating process. Hydrogen sulfide gas pre-protects the catalyst, thereby converting it to a dry start-up process to achieve the purpose of improving catalyst activity, and is suitable for the sulfidation start-up process of various second-type active center catalysts. 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 environme...

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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, in order to adapt to the change of the catalyst type, the start-up mode will increase the material consumption, increase the operation risk, and reduce the catalyst activity. Compared with the catalyst activity improved by adding additives, it is still very important. incomparable

[0012] Chinese patents CN103773436A and CN102311766A introduced 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, which still belongs to the mode of wet start-up, which cannot Thoroughly solve the inherent disadvantages 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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