FIELD: technological processes.
SUBSTANCE: invention relates to low-temperature separation plants and can be used in gas industry for extraction of hydrocarbons C2+ from natural gas. Hydrocarbons extraction unit C2+ from natural gas, equipped with high and low pressure gas lines, which includes a recovery heat exchanger, a dephlegmator, reducing devices and a separator, characterized by that as reducing devices there are installed expanders, kinematically or electrically connected to the external cooling circuit compressor, on the high pressure gas line, a drying unit is first installed with the purge gas inlet line and regeneration gas supply line to the low pressure gas discharge line, then parallel evaporator of external cooling circuit and recuperative heat exchanger and then first expander and dephlegmator, connected to separator and recuperative heat exchanger by low pressure gas supply line, and with separator additionally – dephlegmation gas supply line, on which the second expander is installed, besides, the dephlegmator is equipped with a reflux feed line into the demethanizer, which is equipped with the wide hydrocarbon light fraction supply line from the separator, as well as hydrocarbons discharge line C2+ and a line for feeding methane-containing gas to the separator, wherein the external cooling circuit includes an evaporator located on the coolant circulation line, a compressor, a condenser and a reducing device.
EFFECT: high output of hydrocarbons C2+.
2 cl, 2 dwg
