| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing ethanol without feeding fossil fuel from the outside of biomass, without discharging water and having less waste materials. SOLUTION: This method for producing ethanol is provided by utilizing biomass resources, and comprising (1) a process of burning fuel components from the biomass resources in a boiler 702 to obtain steam, (2) an ethanol fermentation process of adjusting the concentration of a sugar raw material of sugar-containing biomass resources and fermenting the obtained sugar liquid by utilizing yeast, (3) a process of distillation for distilling the obtained fermented liquid by utilizing the heat of the generated steam from the boiler 702 by using a distillation column 203 to obtain water-containing ethanol vapor and (4) a process of dehydrating the water-containing ethanol vapor to obtain anhydrous ethanol Pr. Further, the method of production comprises a process of supplying a prescribed amount of the distillation waste liquid at the bottom part of the distillation column 203 to vaporizing columns 301-304, heating by utilizing the heat held by the water-containing ethanol vapor from the distillation column 203 to evaporate and concentrate the liquid, and a process of returning a prescribed amount of the distillation waste liquid of the bottom part of the distillation column to the ethanol fermentation process for utilizing to adjust the concentration of the sugar raw material. COPYRIGHT: (C)2004,JPO&NCIPI
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