Process for preparing hydrogenating refining catalyst by waste hydrogenating refining catalyst

Abstract

The invention relates to a method of preparing hydrofining catalyst by waste hydrofining catalyst. It adds an active metal component and an alumina-containing substance to the waste hydrofining catalyst powder, and then regenerates. It can improve the activity of catalyst to make the catalyst able to be continued using, thus achieving the purpose of saving resources. As the active metal and the alumina-containing substance are added in a metal salt form and in a hydrated alumina form, respectively, it will absorb the heat by the decomposition of the metal salts and the hydrated alumina in the process of catalyst regeneration to control the heat release of the waste catalyst as regenerating, preventing the catalyst from burning to influence the performance of catalyst. In addition, in the regenerating process, the generated gas as these metal salts decomposed is helpful to improve the pore canal structure of catalyst.

Description

technical field [0001] The invention relates to a method for preparing a hydrorefining catalyst, in particular to a method for preparing a hydrorefining catalyst from a waste hydrorefining catalyst whose reaction performance cannot meet the requirements of the reaction process. Background technique [0002] Every year, a large amount of spent hydrorefining catalysts that cannot be regenerated are produced all over the world. Refineries generally choose to discard these spent catalysts or use them as fillers in construction and other industries, but there are two problems: 1. Because the hydrorefining catalyst generally contains molybdenum, tungsten, and cobalt in a total amount of about 20wt% to 40wt%. , nickel and other valuable metal oxides, such treatment will cause waste of resources. 2. The discarded catalyst will pollute the environment, especially water resources, due to the loss of the above metals. In view of this, many countries now prohibit the random discarding...

AI Technical Summary

Problems solved by technology

Refineries generally choose to discard these spent catalysts or use them as fillers in construction and other industries, but there are two problems: 1. Because the hydrorefining catalyst generally contains molybdenum, tungsten, and cobalt in a total amount of about 20wt% to 40wt%. , nickel and other valuable metal oxides, such treatment will cause waste of resources

2. The discarded catalyst will pollute the environment due to the loss of the above metals, especially water resources

The main reasons for these catalysts being discarded are: 1. The pore structure and acid properties of the catalyst itself are different from those of fresh catalysts

2. Due to the accumulation of metals during long-term operation and regeneration, the migration of surface metals to the interior of the catalyst, and the strong interaction between metals and supports, some metals, especially the metals on the surface of the catalyst, lose their activity or fail to exert their activity.

3. Excessive deposition of impurities on the catalyst

But this only solves the problem of how to improve the pore structure and acid properties of the catalyst, and does not involve how to supplement the active metal components on the catalyst