FIELD: chemical engineering. SUBSTANCE: invention can find use in rectification of crude oil or in chemical, food, pharmaceutical, and other industries and consists in using, as ejecting agent in jet apparatuses, one of fractions or a part of fraction which is completely or partially vaporized in heater. Streams of gas-vapor- liquid mixtures escaping from jet apparatuses are advantageously cooled to produce condensates as tapped fractions, while non-condensed fractions should be used as ejected media from jet apparatuses. It is also of preference for non-condensed gas-vapors ejected from vacuum column by one of jet apparatuses to be used as ejected medium in another (or others) jet apparatus, whereas jet apparatuses located after the one ejecting gas-vapors from vacuum column should preferably be connected to outlet of preceding jet apparatuses directly or through corresponding condensers and separators. In addition, primary pressure in ejecting medium line should preferably be created by circulation pump and heat evolving upon cooling and condensation of gas-liquid mixtures should be used to heat ejecting medium. Evacuation unit is constructed as one- or multistep gas-vapor ejection installation with inter-step condensers and separators provided with discharge lines for condensed liquid fractions, and ejecting line of ejector installation is connected through heater with tapping-off line of one of the fractions. EFFECT: enhanced efficiency of process. 10 cl, 1 dwg
