Preparation method of hydrocracking catalyst

Abstract

The invention discloses a preparation method of a hydrocracking catalyst. The preparation method comprises the following steps: (1) roasting a hydrocracking catalyst inactivated in a catalytic diesel oil hydrogenation conversion process in an oxygen-containing atmosphere till the decarburization rate is 40-80 percent to obtain a decarbonization catalyst; (2) grinding the decarbonization catalyst obtained in the step (1) and sieving for later use; (3) mixing sieved power obtained in the step (2) as a raw material with a hydrocracking catalyst carrier material and a hydrogenated active metal precursor in proportion, adding a peptizing agent and an auxiliary extrusion agent, rolling, extruding and performing high-temperature and high-pressure treatment in an H2S atmosphere to obtain the hydrocracking catalyst. A hydrocracking catalyst regeneration agent is mixed in the preparation process of a fresh catalyst, and in the preparation process, and the vulcanization is completed at the same time. The catalyst has the characteristic of being more reasonable in acid strength distribution, is good in active metal dispersibility and is applied to the catalytic diesel oil hydrogenation conversion process; the initial settling time and the start-up time of the device catalyst are shortened, so that the inactivation rate of the catalyst is reduced, and the catalyst operating cycle is prolonged.

Description

technical field [0001] The invention relates to a preparation method of a catalyst, in particular to a preparation method of a catalytic diesel hydrocracking catalyst. Background technique [0002] In recent years, with the increasingly heavy quality of crude oil processed in China, the raw materials processed by catalytic cracking are also becoming heavier and inferior. In addition, many companies have carried out the optimization of catalytic cracking units in order to improve the quality of gasoline or increase the production of propylene. The modification or improvement of the operating severity of the catalytic cracking unit resulted in deterioration of the quality of catalytic cracking products, especially catalytic diesel. [0003] In order to improve the utilization rate of petroleum resources, improve the overall quality level of gasoline and diesel fuel, realize the goal of product blending optimization and product value maximization, and meet the growing demand fo...

AI Technical Summary

Problems solved by technology

However, there are also some problems in the industrial application of this technology: First, compared with other hydrocracking technology processes, the product distribution and product quality of the FD2G technology process in the initial stage of operation are quite different from the design target. The value and gasoline production rate are obviously low, and the product distribution and gasoline product quality gradually improve with the extension of operation time until reaching a relatively stable level

This process is relatively slow (usually more than 1 month), and it is prominent in industrial devices that the quality of gasoline products is not up to standard for a long period of time in the early stage of operation, which affects the benefits of the enterprise, and further operation to the end of the reaction, the reaction conditions It is more harsh. With the increase of carbon deposition, serious carbon deposition occurs on both strong acid and non-strong acid catalysts, and active metals gather, and the catalyst activity and reaction performance are seriously lost. Therefore, from the reaction conversion rate, product distribution and product quality Both dropped sharply, unable to meet the reaction requirements, at this time the catalyst needs to be regenerated

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