The present invention relates to a glycerin purification unit to prepare a crude glycerin and purified high purity glycerin using the evaporation apparatus, a raw material tank for storing the crude glycerin; It is connected to the raw material tank, a pre-heater for heating the crude glycerol that received in the raw material tank 1 car; Centrifugal thin film evaporator in direct connection with the pre-heater, and when supplied with the heated glycerin separation tank to precipitate the debris of the crude glycerol and simultaneously the second heating to evaporate and the resulting glycerol vapor; Pitch tank for storing the foreign substances is provided in the centrifugal thin film evaporator connected precipitated lower; Multi-stage condenser to the evaporator, a centrifugal thin-film disposed on the outside is installed connected to the centrifugal film evaporator as a lower condensate when supplied to the evaporation of glycerol vapor and re-discharge the glycerol vapor that is not condensed in the upper side; Storage recovery tank which is connected to the pipe being arranged at a lower side of the multi-stage condenser bottoms of the multi-stage condenser for collecting the high purity glycerin being condensed in the multi-stage condenser; And is installed connected to the multi-stage capacitor provides a glycerin purification unit including a vacuum system for holding the centrifugal film evaporator and the multi-stage capacitor in a high vacuum state.
Therefore, to produce a high purity glycerin solve the problem of the purity of the glycerin disadvantage of evaporative glycerin.