FIELD: oil and gas industry.
SUBSTANCE: invention relates to low-temperature condensation and can be used in gas industry. Crude gas is cooled in the first recuperative heat exchanger, divided into condensate and gas, which after cooling in the second recuperative heat exchanger and reduction is subjected to dephlegmation due to cooling of the reduced gas refluxing, supplied from the top of the dephlegmator into its heat exchange section and then into the low-temperature separator, from which condensate is removed and, after heating in the second recuperative heat exchanger, prepared gas. Condensate is drained from condenser, condensates are mixed, reduced and separated in weathering unit to gas returned to low-temperature separator, and a residue which is fed into the demethanizer after heating in the first recuperative heat exchanger, where it is separated into methane-containing gas returned to the low-temperature separator, and a wide fraction of light hydrocarbons, which is fractionated to obtain an ethane-butane fraction and a stable condensate.
EFFECT: high output of hydrocarbons C2+ and avoiding formation of flare gases.
2 cl, 1 dwg
