Method for regenerating diesel hydrocracking catalyst

Abstract

The invention discloses a method for regenerating a diesel hydrocracking catalyst. The method comprises (1) roasting a deactivated hydrocracking catalyst obtained by a diesel catalytic hydrogenation conversion technology in an oxygen-containing atmosphere until a decarburization rate of 40 to 80% so that a decarbonization catalyst is obtained, and (2) transferring the decarburization catalyst obtained in the step (1) into a high-pressure regeneration reactor and treating the catalyst at a high temperature in a hydrogen atmosphere containing hydrogen sulfide to obtain a regenerated hydrocracking catalyst. The catalyst regenerated by the method is used in the diesel catalytic hydrogenation conversion process so that the initial activity stabilization time of the catalyst is shortened, working time is shortened, a deactivation rate of the catalyst is reduced and the catalyst operation cycle is prolonged. In the regeneration process, the re-vulcanization of the catalyst is realized, the regeneration cycle of the device is greatly shortened and the vulcanization effect is significantly improved compared with the conventional vulcanization process.

Description

technical field [0001] The invention relates to a regeneration method of a catalyst, in particular to a regeneration 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 deman...

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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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