Regeneration method of ammoxidation fluid catalyst

Abstract

The invention relates to a regeneration method of an ammoxidation fluid catalyst, which mainly solves the problem of decreased activity of traditional Mo, Bi and Fe oxide system catalysts in the use process of industrial devices. In the invention, the problem of decreased activity is better solved by adopting the technical scheme of roasting ammoxidation fluidized bed equilibrium catalyst according to the component requirements of a fresh body catalyst after corresponding molybdenum content is supplemented at the temperature of 550-700 DEG C under the condition of a roasting atmosphere selected from at least two of air, nitrogen or water vapor to obtain a regenerated catalyst. The catalyst can be used in industrial production of devices for producing acrylonitrile or methacrylonitrile by ammoxidation.

Description

technical field [0001] The present invention relates to a kind of regeneration method of ammoxidation fluidized bed catalyst, especially about the fluidized bed catalyst with Mo, Bi, Fe oxides as the main active components, which is used for the ammoxidation of propylene and isobutene to produce acrylonitrile and methacrylonitrile Regeneration method of bed catalyst. Background technique [0002] At present, the industrial production of acrylonitrile is realized through the propylene ammoxidation reaction process, which was invented by BP in the 1960s. The process uses a multi-component composite oxide catalyst whose main components are Mo, Bi, and Fe oxides. Catalyst technology is one of the core technologies of this process. After years of continuous improvement, the performance of the catalyst has been greatly improved. At present, the single yield of acrylonitrile with fresh catalyst can reach more than 80%. After the industrial device is used for a long time, the acti...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that in the prior art, the catalyst in the reaction bed is unloaded and mechanically pulverized or impregnated with a solution of some composition, which will cause the inability to uniformly impregnate when the amount of the solution is small, and after the amount of the solution increases The catalyst is swollen and broken, and the operability is poor; the yield of acrylonitrile decreases after long-term operation of the catalyst obtained by other regeneration methods, and the effect is not good. A new regeneration method for the ammoxidation fluidized bed catalyst is provided.

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