The utility model provides a reduced pressure
distillation system which comprises a kettle body, a
cooling tower and a receiving tank, the kettle body penetrates through the
cooling tower through a pipeline to be communicated with the receiving tank, a jacket is fixed to the outer wall of the kettle body, a
propeller is arranged in the kettle body, a conical
barrel with an upward large-
diameter end is vertically arranged in the kettle body, and the conical
barrel is fixed to the inner wall of the kettle body through a connecting rod; a liquid distribution disc higher than the liquid level is fixed to the upper end of the inner wall of the conical
barrel, and the
propeller is arranged at the lower end of the liquid level in the conical barrel and pushes liquid downwards. According to the reduced pressure
distillation system disclosed by the invention, the synthetic solution can be circulated along the inside and outside of the conical barrel through pushing of the
propeller, so that bumping caused by overheated liquid formed by the synthetic solution during reduced pressure
distillation is avoided, and the distillation efficiency is also improved. When entering the conical barrel, the synthetic solution can flow downwards along the
conical surface of the inner wall and is slowed down through interception of the liquid distribution disc. The
evaporation area during distillation is increased by the
conical surface and the liquid distribution disc, and meanwhile, the synthetic solution is slowed down during falling, so that the
evaporation effect is enhanced.