FIELD: gas industry.
SUBSTANCE: invention relates to two options of a plant for natural gas de-ethanization with liquefied natural gas (hereinafter – LNG) production. According to one of the options, the plant is equipped with lines of high-pressure and low-pressure gas, it includes a drying unit, a recuperative heat exchanger, expanders connected to a compressor by means of kinematic or electric connection, a dephlegmator equipped with a phlegm output line connected via a line of dephlegmation gas supply equipped with an expander and a line of low-pressure gas supply to a separator, which is equipped with lines of methane-containing gas supply from a fractionation unit and lines of output of light hydrocarbon wide fraction to the fractionation unit. The plant is characterized in that a demethanizer is installed as the separator connected to the dephlegmator via the phlegm supply line equipped with a reducing device, and equipped with LNG output line located below the junction of the line of dephlegmation gas supply, and connected to the separator installed on the line of high-pressure gas in front of the dephlegmator via a condensate supply line equipped with a reducing device, and connected to a cooling unit installed on a bypass line of the recuperative heat exchanger via a line of circulation irrigation input/output.
EFFECT: increase in C2+ hydrocarbon output.
2 cl, 2 dwg
