FIELD: organic chemistry, chemical technology. SUBSTANCE: invention relates to method for evaporating aminonitrile and water in synthesis of lactam by reaction between aminonitrile and water in the vapor phase in the presence of aluminum hydroxide as a catalyst. Method involves contacting aminonitrile in its liquid state and steam for evaporating aminonitrile by contacting liquid/steam and formed mixture aminonitrile/steam is brought about to temperature in heat-exchanger device when the complete evaporation of mixture occurs. Method provides reducing the formation of heavy by-side products and to prolong working time of catalyst. EFFECT: improved evaporating method. 12 cl, 2 ex
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