Fluidized-bed catalyst for ammoxidation of propylene or isobutylene

Abstract

The invention provides a fluid-bed catalyst, which can withstand high voltage and high load, contains non corrosive halide, and has a high single-pass yield. The catalyst comprises metal oxide containing multi active component of Mo, Bi, Fe, Ni and Sm, and a carrier of SiO2, Al2O3 or the mixture. It can be used to prepare the high selective acrylic with propone. Comparing with the prior technique, in the condition of keeping the single- pass yield of acrylic, with the invented catalyst, production capacity of fluid-bed reactor can be improved by 20- 30%, and the usage of the catalyst can decreases by 35%.

Description

technical field [0001] The invention relates to a fluidized bed catalyst for preparing unsaturated nitrile by ammoxidation reaction of α-olefin, and its main active components include various metal oxides such as molybdenum, bismuth, iron and nickel. Background technique [0002] At present, the fluidized bed catalysts used in the ammoxidation of α-olefins to produce unsaturated nitriles (such as ammoxidation of propylene and isobutylene to produce acrylonitrile or methacrylonitrile) are mainly divided into two categories, namely Mo-Bi catalysts And Fe-Sb catalysts. With the continuous advancement of science and technology, new patents have been released for catalysts used in the ammoxidation of olefins to produce unsaturated nitriles to meet the different requirements of the process for producing unsaturated nitriles by ammoxidation of α-olefins, such as the introduction of patent US462202 An improved Mo-Bi catalyst has been developed, the advantage of which is that the re...

AI Technical Summary

Problems solved by technology

However, the general catalyst reacts under high reaction pressure and high load, and the single-pass yield of acrylonitrile drops a lot, which is very unfavorable economically.

Chinese patent CN1187385 introduces a catalyst made by introducing halogen and ensuring a certain ratio among Cr, Fe, and Bi, which has the characteristics of high pressure resistance and high load resistance, but the catalyst introduces halogen, which is highly corrosive and unfavorable to the device.

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