FIELD: gas industry.
SUBSTANCE: invention relates to apparatus for extracting C2+ hydrocarbons from main gas. Invention relates to low-temperature dephlegmation apparatus with rectification for deethanization of natural gas with high and low pressure gas lines, including a drying unit located on the high pressure gas line, after which the latter is divided into two lines, a recovery heat exchanger and the second line adjacency are located on the first line, after which there is a first expander and a refluxer with a reflux outlet line connected by a reflux gas feed line equipped with a second expander, and a low pressure gas supply line with a separator, which is connected to fractionation unit by supply lines of methane-containing gas and wide fraction of light hydrocarbons. Expanders are connected to compressor by means of kinematic or electric connection. Separator is demethanizer, connected to dephlegmator by reflux feed line with reducing device, with separator, installed on high pressure gas line before dephlegmator, condensate supply line with reducing device, and with second recovery heat exchanger installed on second line of high pressure gas downstream of compression refrigerating machine by circulating reflux inlet/outlet line. Invention also relates to installation variant.
EFFECT: technical result is high output of hydrocarbons C2+.
2 cl, 2 dwg
