FIELD: chemical engineering. SUBSTANCE: primary concentrate stream is fed into preliminary purification unit, cooled in the end cooler, purified in adsorption purification unit, cooled in main heat exchanger, liquefied in pole-type condenser, and directed into pole-type line, wherein pressure of liquefied concentrate stream undergoes preliminary increase and stream is further transferred into pressure-increase step intake line to be transformed into intermediate two-phase stream. The latter is lifted over pull line into high-potential pressure-increase step vapor separator, wherein gas and liquid phases are separated. Gas phase is withdrawn in the form of return concentrate stream and mixed with purified concentrate stream before liquefaction. Liquid phase is passed through pressure- increase step pressure line into pressure-increase step high-pressure line. The latter stream is introduced into evaporator-condenser to be gasified and therefrom into rectification column, wherein stream is separated to form krypton-xenon mixture and blow-off oxygen. EFFECT: increased reliability and safety of process and increased its thermodynamic efficiency. 8 cl, 1 dwg
