A method for the production of a stable aminoacetonitrile

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PROBLEM TO BE SOLVED : To provide a method for increasing production of acetonitrile, capable of stably increasing the production of the acetonitrile when acrylonitrile is produced by ammoxidation reaction of propylene, capable of preventing a yield of the acrylonitrile from being decreased, and making it possible that the reaction is stably continued for a long period. SOLUTION : This method for increasing the production of the acetonitrile comprises using a catalyst which is supported on silica and comprises an oxide composition expressed by the formula (1) : Moy Bip Feq Aa Bb Cc Dd Oe (A is Ni and/or Co; B is one or more kinds of elements selected from K, Rb, and Cs; C is Mg and/or Zn; and D is one or more kinds of elements selected from rare earth elements), feeding a fluidized bed reactor with one or more kinds of compounds selected from ethanol, ethyl ether, acetic acid, acetic anhydride, ethyl acetate, etc., in a ratio on carbon base of 0.005-0.2 per weight of the propylene, and controlling an oxygen concentration in the outlet gas of the reactor to be 0.1-1.5 vol.%, when the acrylonitrile is produced by subjecting the propylene, ammonia, and oxygen to the ammoxidation reaction with the reactor in the presence of the catalyst.