| 摘要 |
PURPOSE:To obtain a fermentation product having low boiling point, free from yeasts, fermentation raw materials and inorganic salts, and having higher concentration than the fermented liquid, by contacting the fermentation liquid to a surface of a porous hydrophobic membrane, and keeping the other side of the membrane in a state having low pressure. CONSTITUTION:The fermentation liquid in the fermentation liquid tank 2 in the constant-temperature water bath 1 is pumped with the pump 3 to the separation and concentration apparatus 4, and the vapor is permeated to the evacuated side through the hydrophobic porous membrane. The vapor is liquefied in the cold trap 5. The pressure in the evacuated side is preferably <=100 mmHg, and is preferably <=0.5 atm, especially <=250 mmHg when a carrier gas is used in combination with the vapor.
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