| 摘要 |
The invention relates to a method and apparatus for preparing an ethanol/water mixture, in which fermentable raw materials selected from sugars and raw materials capable of being hydrolyzed into fermentable sugars, and the necessary auxiliary substances are fed into a reactor; the raw materials are fermented in the reactor, ethanol/water mixture is separated from the reactor fermentation solution in an evaporator; and non-fermented matter is removed from the reactor. According to the invention, the reactor fermentation solution is fed continuously into a first falling-film evaporator during fermentation; the ethanol/water mixture is evaporated in the first falling-film evaporator, the evaporate obtained from the evaporator is condensed, and the condensed ethanol/water mixture is concentrated in a second falling-film evaporator, which is arranged in series with the first falling-film evaporator; water is removed as underflow from the second evaporator; and non-volatile matter is removed from the first evaporator and is recycled to the reactor. |
