FIELD: machine building.
SUBSTANCE: procedure consists in at least following stages: (a) supply of partially condensed raw stock flow (10) of pressure above 60 bar into first gas-liquid separator (2); (b) division of raw stock flow (10) in first separator (2) to gaseous flow (20) and liquid (30); (c) expansion of liquid flow (30) and supply of flow (50) into rectification column (3); (d) expansion of gaseous flow (20) for obtaining at least partially condensed flow (60), and successive supply of flow (70) into rectification column (3); (e) removal gaseous flow (80) from rectification column (3); partial condensation of gaseous flow (80) and supply (90) into second separator (8); (f) separation of flow (90) supplied to second separator (8) for obtaining liquid flow (100) and gaseous flow (110); (g) supply of liquid flow (100) produced at stage (f) to rectification column; and (h) liquefaction of gaseous flow (110) for production of liquefied flow (200), wherein gaseous flow (80) removed from rectification column (3) is partially condensed due to heat exchange with flow (60) to its (70) supply into rectification column (3) and wherein gaseous flow (110) is subjected to heat exchange with raw stock flow (10a) to it (160) liquefaction for partial condensation of raw sock flow (10a).
EFFECT: reduced capital expenditures and raised reliability.
17 cl, 2 dwg
