FIELD: gas processing. SUBSTANCE: natural gas processing includes multistep low-temperature condensation of cooled liquefied gas. Gas is separated into gas streams, which are then divided in volume proportion 1:4. The second of resulting streams is cooled in turboexpander and rectified to yield methane and ethane fractions. Rectification is carried out stepwise in dismountable demethanizator consisting of upper and lower columns under pressure 1.58 MPa and in ethane column under pressure 2.96 MPa. Heat is transferred to the lower demethanizator column and to the ethane column from three heat exchangers in which initial natural gas is utilized as heat carrier. EFFECT: increased ethane recovery and reduced power consumption. 2 cl, 1 dwg
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