FIELD: processing liquefied natural gases. SUBSTANCE: portion of liquefied mixture of hydrocarbons is cooled through primary expansion in turbine 21, direct heat exchange 2 and secondary static expansion 3. Cooled portion is fractionated in denitration column into gas phase 10 consisting on nitrogen and methane and escaping from head section of column 5 and nitrogen-free flow 11 removed from base of above-mentioned column. Fraction 6 and second fraction 8 are taken from column 5; mixtures are passed through heat exchanger 2 for cooling portion 1, after which they are again injected into column 5 as first reboiler fraction 7 and second reboiler fraction 9. After regeneration of its negative calories 13, gas fraction 10 is compressed till combustible gas flow 20 is obtained. EFFECT: enhanced efficiency. 7 cl, 4 dwg
