FIELD: cryogenic engineering; production of krypton-xenon concentrate. SUBSTANCE: evaporator is provided with jacket heated by water steam and hollow expulsor connected with jacket by means of manifold and circular heat-transfer fins of different size on upper and lower sections of evaporator secured to evaporator housing at spaced relation to expulsor or at spaced relation to housing. Area of circular clearances on upper section which is equal to (0.5-0.8) of working height of evaporator reduces downwards; free edges of fins have projections whose height is equal to (0,004-0,015)Dk where Dk is diameter of evaporator housing. Provided in upper portion of evaporator is liquid separator fitted with superheated steam outlet branch pipe which is connected with heat exchanger-cooler by means of pipe line fitted with valve and with krypton column below feed liquid flow inlet at distance of (o.1-0.4)H where H is height of contact lower portion of section of krypton column. Evaporator-condenser of krypton column is made from heat-exchange elements having finned surface on side of boiling or surface with capillary porous heat-conducting coat. EFFECT: reduced content of hydrocarbons in concentrate; increased concentration of krypton and xenon; reduced power requirements. 3 cl, 2 dwg
