FIELD: oil refining industry. SUBSTANCE: method consists in delivery of crude oil into vacuum column and pumping out of vapor-gas phase by means of liquid-gas jet device. Liquid working medium is delivered by pump from separator to liquid input of liquid-gas jet device, vapor-gas phase is pumped out from vacuum column through gas input of liquid-gas jet device and gas-liquid mixture from liquid-gas jet device is delivered into separator, thus forming circulation circuit of liquid working medium: pump-liquid-gas jet device - separator - pump. Compressed gas is separated in separator from liquid working medium is delivered to users, as required. Hydrocarbon-containing medium is used as liquid working medium. Part of liquid working medium from separator is directed to vacuum separator wherefrom gaseous medium is pumped out by vacuum pump to build pressure in separator lower than atmospheric pressure, and liquid medium is simultaneously let out of vacuum separator. Proposed vacuum building up plant includes liquid-gas jet device, separator with compressed gas outlet main line and pump. Liquid-gas jet device communicates through liquid input with delivery side of pump and it communicates through gas input with vacuum column and through output, with separator, and the latter communicates through liquid working medium output with suction side of pump, thus forming circulation circuit of liquid working medium: pump, liquid-gas jet device - separator - pump. Plant is furnished with vacuum separator with liquid medium output and gaseous medium output and vacuum pump. Vacuum separator is connected by input by with liquid medium circulation circuit and by output of gaseous medium, with vacuum pump. According to other design version, vacuum separator is connected by input with liquid working medium circulation, and by gaseous medium output with input of passive gas into ejector whose output communicates with liquid-packed ring pump, and nozzle of active gas of ejector communicates with compressed gas source. EFFECT: enhanced efficiency of plant for building up vacuum and building up vacuum in rectifying tower at minimum adverse effect on environment. 15 cl, 2 dwg
