A kind of preparation method of catalytic diesel hydrocracking catalyst

Abstract

The invention discloses a preparation method of a catalytic diesel hydrocracking catalyst, which includes the following contents: (1) roasting the deactivated hydrocracking catalyst in the catalytic diesel hydroconversion process in an oxygen-containing atmosphere until the decarbonization rate is 40 %~80% to obtain a decarburization catalyst; (2) pulverize the decarburization catalyst obtained in step (1) to obtain decarburization catalyst powder, and sieve the powder for later use; (3) pulverize the decarburization catalyst obtained in step (2) for later use; The sieved powder, hydrocracking catalyst carrier material and hydrogenation active metal precursor are mixed, and then dilute nitric acid solution and sesbania powder are added, followed by rolling, extrusion, and high-temperature treatment in an inert atmosphere to obtain a catalytic diesel hydrocracking catalyst. The catalyst prepared by the invention has more reasonable acid intensity distribution characteristics and good active metal dispersion, and is used in the catalytic diesel hydrogenation conversion process to shorten the initial activation and stabilization time of the device catalyst, shorten the start-up time, and reduce the catalyst deactivation The rate decreases and the catalyst operation cycle is prolonged.

Description

technical field [0001] The invention belongs to catalyst preparation technology, in particular to a preparation method of 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 for cle...

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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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