FIELD: cryogenic engineering. SUBSTANCE: initial raw containing methane, ethylene and ethane is cooled and separated by mass exchange method into gas and liquid condensate which is fed to the first fraction system wherein the vapor methane fraction is extracted from it. The vapor fraction is cooled up to a cryogenic temperature and separated into two portions. One portion of methane fraction is directed to sprinkling of the first fraction system. The other portion is cooled additionally up to the cryogenic temperature lower than the temperature of cooling of the total fraction and is directed to the second fraction system wherein the portion is separated into liquid enriched with ethylene and vapor stream. EFFECT: enhanced efficiency. 8 cl, 2 dwg, 1 tbl
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