Energy-saving separation system for removing light hydrocarbon

The utility model relates to the technical field of raw material pretreatment of C4 raw material deep processing devices, in particular to an energy-saving separation system for removing light hydrocarbon. Comprising a light component removal tower, a condenser, a purge gas deep freezer, a reflux tank and a reflux pump which are sequentially communicated through pipelines, a light component removal tower feed port is formed in the middle of the light component removal tower, an extracting agent reboiler and a steam reboiler are arranged on the lower portion of the light component removal tower, and the bottom of the light component removal tower is communicated with a light component removal tower bottom pump through a cooler; the return tank is horizontal, a feed port pipeline of the return tank is communicated with an outlet of the purge gas deep freezer, and a discharge port pipeline of the return tank is communicated with an inlet of the return pump; a condensate water reboiler is arranged at the lower pa