FIELD: gas separation methods. SUBSTANCE: invention relates to cryogenic technology, more specifically to low-temperature air rectification technology to be applied in chemical and petrochemical industries. Method of invention includes: separating main air stream and expanded air stream in lower and upper columns, respectively; feeding main liquid oxygen stream from upper column into full-flow condensers' unit; feeding gas nitrogen stream from lower column into full-flow condensers' unit; condensing gas nitrogen stream and feeding liquid nitrogen stream from full-flow condensers' unit into lower column; partially evaporating main liquid oxygen stream in full-flow condensers' unit; feeding a part of evaporated gas oxygen from full-flow condensers' unit into upper column and withdrawing the other part of evaporated gas oxygen as gas oxygen product stream; withdrawing liquid oxygen recycle stream from full-flow condensers' unit; feeding a part of liquid oxygen recycle stream into evaporator-condenser; partially evaporating the latter stream in evaporator-condenser to form at least two streams: purified gas oxygen stream and oxygen stream removing explosive impurities from air- separation plant; and isolating xenon concentrate from the latter stream involving adsorption technique. EFFECT: increased economical efficiency due to simplified flowsheet. 2 cl, 2 dwg, 1 tbl
