FIELD: technological processes.
SUBSTANCE: invention relates to two embodiments of a low-temperature dephlegmation apparatus with rectification. According to one of the embodiments, the object is a unit for de-ethanization of the main gas using low-temperature dephlegmation technology with rectification of the low-pressure and high-pressure gas lines LTDR, which includes a drying unit, a recuperative heat exchanger, expanders connected to the compressor by means of kinematic or electrical connection, a refluxer equipped with reflux and reflux gas lines with an expander, a separator with low pressure gas supply lines, wide fraction of light hydrocarbons, as well as methane-containing gas from fractionation unit, characterized by that as separator demethanizer is installed, connected to refluxer by reflux feed line equipped with reducing device, dephlegmation gas outlet line is connected to the low pressure gas supply line, the light hydrocarbons wide fraction supply line is connected to the second recuperative heat exchanger placed on the bypass heat exchanger bypass line downstream of the compression refrigerating machine, wherein the wide hydrocarbon light hydrocarbon feed line is connected to the demethanizer after the second recuperative heat exchanger.
EFFECT: technical result is high output of hydrocarbons C2+.
2 cl, 2 dwg
