FIELD: units for separation of air for obtaining nitrogen and oxygen; chemical, gas-and-oil producing industry, aviation, medicine, etc. SUBSTANCE: air preliminarily treated in compressor and purification units, dehumidication and cooling units is separated in low-temperature separation unit into commercial oxygen fed to oxygen line and mixture enriched with nitrogen which passes in succession through cooling, compression and membrane separation units for obtaining commercial gaseous nitrogen fed to nitrogen line. EFFECT: possibility of simultaneous obtaining of commercial oxygen and nitrogen products; reduced amount of starting air due to return of oxygen to cycle which was exhausted into atmosphere with nitrogen concentrate. 1 dwg
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