Method for preparing catalyst for catalyzing diesel hydrocracking

Abstract

The invention discloses a method for preparing a catalyst for catalyzing diesel hydrocracking. The method comprises the following steps: (1) roasting a hydrocracking catalyst inactivated in a diesel hydro-conversion catalyzing process in an oxygen-containing atmosphere until a decarburization rate is 40-80% so as to obtain a decarburization catalyst; (2) grinding the decarburization catalyst obtained in the step (1) so as to obtain decarburization catalyst powder, and screening the powder for later use; (3) mixing the screened powder obtained in the step (2), a hydrocracking catalyst carrier material and a hydrogenation activity metal precursor, adding dilute nitric acid solution and sesbania powder, rolling, extruding, performing high-temperature treatment in an inert atmosphere, so as to obtain the catalyst for catalyzing diesel hydrocracking. The catalyst prepared by the invention has reasonable acid strength distribution characteristics and good active metal dispersion and is applied to the diesel hydro-conversion catalyzing process, so that the initial activity stabilization time of the device catalyst is shortened, the on-stream time is shortened, the catalyst inactivation rate is reduced, and the catalyst running period 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 p

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