Method for regenerating spent hydrogenation catalyst

Abstract

The invention discloses a method for regenerating a spent hydrogenation catalyst. The method comprises the following steps: S1, subjecting the spent hydrogenation catalyst to destructive distillationtreatment to obtain a dewatered and de-oiled catalyst A and destructive distillation gas; S2, subjecting the catalyst A to activation treatment to obtain a catalyst B; S3, subjecting the catalyst B togrinding treatment to obtain a regenerated hydrogenation catalyst. The regenerated hydrogenation catalyst can be directly used in a suspension bed hydrogenation process, and can also be used for a suspension bed hydrogenation process after being mixed with a new hydrogenation catalyst. The method is free of acid solution washing and roasting and decarbidizing treatment, and the destructive distillation process and the activation process are directly adopted, so that effective composite utilization of a carrier and active ingredients is realized; and the load performance of the carrier loadedwith the active metal in the spent hydrogenation catalyst is not damaged, the catalytic hydrogenation performance of the carrier in the spent hydrogenation catalyst and the active metal loaded on thecarrier in the hydrogenation process of the suspended bed is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of catalyst waste agent recovery, in particular to a method for regenerating a spent hydrogenation catalyst, in particular to a method for regenerating a waste hydrogenation composite catalyst in a suspended bed. Background technique [0002] There are many types of suspended bed hydrogenation catalysts. With the improvement of the performance requirements of hydrogenation catalysts, suspended bed hydrogenation composite catalysts have been widely used. The hydrogenation composite catalyst has properties such as hydrodesulfurization, hydrocracking and hydrodenitrogenation. Commonly used suspended bed hydrogenation composite catalysts include molybdenum-cobalt-alumina system, molybdenum-cobalt-nickel-alumina system, etc., through the catalytic hydrogenation of heavy oil, residual oil, high-temperature coal tar and other heavy oil raw materials, the heavy Lightweight oil raw materials. [0003] The hydrogena...

AI Technical Summary

Problems solved by technology

But, there are following problems in this flow process: 1) valuable metal recovery such as molybdenum, nickel is incomplete, and recovery rate is low; environment; 3) The sulfur of metal sulfides is oxidized during incineration and oxidative roasting, and converted into sulfur dioxide to pollute the environment; 4) The treated waste residue still contains heavy metal salts, and long-term stacking and treatment may cause secondary pollution

[0007] However, after analysis, it is found that the technical solutions disclosed in the above patent documents have the following defects: 1) the carrier and active components are not effectively compounded and utilized during the recovery and treatment of spent hydrogenation catalysts; 2) metal impurities are removed by acid washing, but some metal impurities It can be used as an active metal in the subsequent hydrogenation process, resulting in ineffective use of these metal impurities; 3) by dry distillation, part of the coke material is obtained through dry distillation reaction to obtain liquid hydrocarbons, but the remaining coke material is not effectively used; and then the carbon deposit is removed by roasting, Carbon deposits are not utilized

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