Ammoxidation method to manufacturing unsaturated nitrile fluid-bed catalyst

Abstract

The present invention relates to a fluidized bed catalyst of unsaturated nitrile which is produced by an ammoxidation. The present invention mainly solves the problems in the prior art that a yield of an acrylonitrile catalyst in the reaction of the industrial device is not high, and the yield is gradually reduced with the prolonged time; the by-product s of CO2, CO and HCN are increased; the stability of the catalyst is not good enough. The present invention solves the problems well by a technical proposal that a catalyst carrier is selected from SiO2 or Al2O3a or a mixture of SiO2 and Al2O3, and the catalyst contains active components, the general formula of which is as follows: in the formula of Mo12BiaFebNicXdYeZfQgOx, the X is selected from at least one of Mg, Co, Ca, Be, Cu, Zn, Pb, Mn or Te; the Y is selected from at least one of La, Ce or Sm; the Z is selected from at least one of K, Rb, Na, Li or Cs; the Q is selected from at least one of Ga, Ge or Pr. The present invention can be used for the industrial production of acrylonitrile which is produced by a propylene ammoxidation.

Description

technical field [0001] The invention relates to a fluidized bed catalyst for preparing unsaturated nitrile by ammoxidation, in particular to a fluidized bed catalyst for preparing acrylonitrile and butenenitrile by ammoxidation of propylene and butene. Background technique [0002] The ammoxidation of olefins to prepare α and β unsaturated nitriles was developed by BP in the 1960s. The core technology of this process is to use a catalyst whose active components contain Mo and Bi. After continuous improvement, the Mo-Bi series catalyst is very mature at present, and the process of preparing acrylonitrile by ammoxidation of propylene has been widely used in industry. In the past, the improvement of the catalyst was mainly carried out from the aspects of the activity and stability of the catalyst, such as adding transition metals to the active component to improve the activity and increase the yield of the product; adding rare earth elements to improve the redox ability; adding...

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Problems solved by technology

[0006] The technical problem to be solved by this invention is that the reaction yield of prior art acrylonitrile catalyst is not high in industrial installations, and gradually decreases as time prolongs, and the by-product CO 2 , CO, HCN rise, catalyst stability has become one of the focus of the industry, providing a new fluidized bed catalyst for the ammoxidation of propylene and isobutene to unsaturated nitrile

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