Method for grading catalysts for hydrotreatment

Abstract

The invention discloses a scheme for grading catalysts for hydrotreatment, comprising the following steps: passing a residual-oil raw material and hydrogen through a protective agent, a demetallization catalyst 1, a desulfurization catalyst and a denitrification catalyst in sequence, and then passing a reaction product through a demetallization catalyst 2, wherein the loading volume of the demetallization catalyst 2 is 10-30% of the total loading volume, and the reaction product passing through the demetallization catalyst 2 can be further used for deep desulfurization under the action of a wax-oil hydrogenation catalyst. By adopting the grading method, the nature of the residual-oil hydrogenation product can be changed, particularly the content of metal and carbon residue in the residual-oil hydrogenation product can be reduced, and the FCC raw material can be optimized. In addition, the existing residual-oil hydrogenation device does not need to be adjusted. The method consumes the least energy, is easy to operate and is suitable for industrial application.

Description

technical field [0001] The invention relates to a gradation scheme of a hydrogenation treatment catalyst, in particular to a gradation scheme of a residual oil fixed bed hydrogenation treatment catalyst, which is suitable for the residual oil fixed bed hydrogenation treatment process. Background technique [0002] As we all know, the reactions in the hydrotreating process of residual oil mainly include hydrodesulfurization, hydrodenitrogenation, hydrodemetallization, hydrosaturation of olefins and aromatics, and hydrocracking of various hydrocarbons. Generally speaking, the hydrogenation reaction of residual oil is an exothermic reaction, the hydrodemetallization reaction is moderate, and the desulfurization reaction and denitrogenation reaction are strong exothermic reactions. The most widely used and mature process for residual oil hydrotreating in industry is fixed bed. In the fixed bed residue treatment technology, major companies in the world such as UOP, Chevron, Unit...

AI Technical Summary

Problems solved by technology

The traditional grading method can meet the feed requirements of the FCC unit, but it fails to consider further removing impurities such as metals in the raw material, optimizing the FCC raw material, reducing FCC energy consumption, and improving the operating cycle of the FCC unit