Method for preparing hydrofining catalyst by waste catalyst

Abstract

A process for preparing the hydrorefining catalyst from the used one includes such steps as adding less active metal component to the used hydrorefining catalyst powder and activating (regenerating). It features that in said regeneration procedure, the metallic salt is decomposed to absorb heat and generate gas to improve the artery structure of catalyst.

Description

technical field [0001] The invention relates to a method for preparing a hydrorefining catalyst from a waste 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 20w% to 40w%. , 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 t...

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 20w% to 40w%. , 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

However, this patent 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

In addition, there is no other report on reusing the spent catalyst by replenishing the amount of active metals on the spent catalyst