FIELD: production of unsaturated nitriles of suitable olefins, NH3 and oxygen. SUBSTANCE: temperature of ammonia inside pipeline of fluidized bed reactors is maintained lower than its dissociation point; and/or temperature of inside surface of pipeline is maintained lower than temperature at which any single atomic nitrogen may interact with pipeline to produce nitride. EFFECT: improved efficiency of the method. 12 cl, 3 dwg
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