Hydrous ethanol distillation apparatus and method for producing absolute ethanol

摘要

PROBLEM TO BE SOLVED: To provide a distillation apparatus of hydrous ethanol, having an appropriate theoretical plate number, excellent in energy saving and having a simplified appliance, and a manufacturing method of absolute ethanol using the same.SOLUTION: A distillation apparatus of hydrous ethanol, including a distillation column 1, a compressor 2, an intermediate heating part 3 and a separation tank 4 is configured such that: there are included an upper layer 1a, an intermediate layer 1b, a lower layer 1c, a solvent supply port and a vapor outlet 11 on an apex of the column, a hydrous ethanol supply port between the upper layer 1a and the intermediate layer 1b, an intermediate liquid holding part 1d between the intermediate layer 1b and the lower layer 1c, and a reboiler 14 and an absolute ethanol taking-out port 12 on a bottom of the column; the compressor 2 is connected to a vapor outlet 11 of the apex of the distillation column; the separation tank 4 stores condensate liquid 18 of vapor used as a heat source in the intermediate heating part 3 so as to gravitationally separate water and a solvent; and there is included means for recycling the solvent separated in the separation tank 4 to a solvent supply port 8 of the apex of the distillation column. A manufacturing method of absolute ethanol, using the distillation apparatus is also provided.SELECTED DRAWING: Figure 1