FIELD: gas industry.
SUBSTANCE: invention relates to apparatus for extracting C2+ hydrocarbons from main gas. Invention relates to deethanization of natural gas using low-temperature dephlegmation and fractionation (LTDF) technology with high and low pressure gas lines, including a dehydration unit located on the high pressure gas line, after which the latter is divided into two lines. On the first line there is a recuperative heat exchanger and abutment of the second line, after which the first expander and refluxer with reflux output line are located, equipped with a reflux gas outlet line with a second expander, connected by a low pressure gas supply line to the 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 refluxer by reflux feed line equipped with reducing device connected to separator, installed on high pressure gas line before dephlegmator, condensate supply line with reducing device, and with second recuperative heat exchanger, installed on the second high pressure gas line downstream of the compression refrigerating machine, the circulating reflux inlet/outlet line, wherein the reflux gas discharge line is connected to the low pressure gas supply line. Invention also relates to installation variant.
EFFECT: technical result is high output of hydrocarbons C2+.
2 cl, 2 dwg
