FIELD: gas industry.
SUBSTANCE: invention relates to methods and device for extracting of liquefied natural gas (LNG) stream from hydrocarbon-containing natural gas stream using single closed cycle with mixed refrigerant. Disclosed method initial gas flow is cooled down. Then it is divided in first distillation column to form the first methane-rich lower stream and the first methane-depleted upper stream. Then first methane-rich flow is fractionated in the second distillation column and forming the second methane-rich lower stream and the second methane-depleted upper stream. Further, the second methane-enriched lower stream is extracted.
EFFECT: enabling efficient extraction of methane from synthetic gas and other hydrocarbon-containing gases despite the presence of carbon monoxide and hydrogen in these gases.
29 cl, 1 dwg, 1 tbl
