FIELD: oil and petrochemical industrial: fractionation of heavy oil products, etc. SUBSTANCE: proposed method consists in forming vacuum in industrial equipment by means of liquid-vapor-gas ejectors with the aid of ejecting riser where gas-vapor phase is condensed and compressed at several stages: at first stage - by means of multi- jet liquid ejector; at subsequent stages, delivery of working fluid is effected by tangential flow at increase of cross section of riser at each stage. At last stage, gas-vapor-liquid mixture is directed horizontally for preliminary separation of liquid and gas. EFFECT: enhanced efficiency and reliability of method. 4 cl, 1 dwg
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