| 摘要 |
A method for producing ethanol by alcohol fermentation of a saccharide obtained by hydrolyzing cellulosic biomass in a supercritical or subcritical state, wherein excessive decomposition and caramelization of the saccharide are inhibited to prevent a reduction in yield of the saccharide, and flash steam is effectively used. The method for producing ethanol of the present invention is characterized in that in a saccharification/decomposition step, a slurry after saccharification/decomposition, is flash-evaporated in a first flash tank so as to have a temperature of 150° C. to 200° C.; the slurry after saccharification/decomposition, which is taken from the first flash tank, is further flash-evaporated in a second flash tank so as to have a temperature of 100° C. to 120° C.; and first flash steam generated from the first flash tank is used as a heat source in the saccharification/decomposition step or a distillation step.
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