Cycle fluid is energy -conserving system for isobutane tower

The utility model belongs to chemical separation system field especially relates to a cycle fluid is energy -conserving system for isobutane tower, its characterized in that: including at the bottom of reboiler, weight -removing column, the weight -removing column reboiler, deisobutanizer top of the tower cooler, deisobutanizer return tank, deisobutanizer backwash pump, weight -removing column top of the tower cooler, weight -removing column return tank, weight -removing column backwash pump at the bottom of the deisobutanizer, deisobutanizer top of the tower heat exchanger, compressor, working medium flash tank, isobutane tower. The utility model discloses well overhead gas shifts its latent heat to the cycle fluid in through high -efficiency heat exchanger, and the cycle fluid is improved the potential temperature by the compressor after, for the heating of bottoms material, simultaneously, the circulation in the throttling expansion implementation system is passed through to working medium, has increased b