NOVELTY - Preparing alcohol includes using membrane, tank and poly-dimethyl siloxane silicone rubber film. Sterilizing membrane and pipelines by using 70 wt.% alcohol. Rinsing the membrane and pipelines with sterilized water to remove residual influence of alcohol. Drying the membrane and pipelines from hot air. Preparing culture medium includes component A, component B and component C. Component A includes 400g/L of glucose, 20g/L of monopotassium phosphate and 1.2g/L of magnesium sulfate. Component B includes 32g/L of yeast extract and 20g/L of ammonium sulfate.    USE - Method for preparing alcohol and separating volatile product e.g. butanol, propanol, acetone, 3-propylene glycol and glycerol (claimed).    ADVANTAGE - The method enables to prepare alcohol, which has low biological activity, increases efficiency and biomass of fermentation, shortens the fermentation period, increases the fermentation strength and increases production capacity of reactor. The method ensures to reduce processing difficulty and energy consumption, clean product and cost-effective.    DETAILED DESCRIPTION - Preparing alcohol includes using membrane, tank and poly-dimethyl siloxane silicone rubber film. Sterilizing membrane and pipelines by using 70 wt.% alcohol. Rinsing the membrane and pipelines with sterilized water to remove residual influence of alcohol. Drying the membrane and pipelines from hot air. Preparing culture medium includes component A, component B and component C. Component A includes 400g/L of glucose, 20g/L of monopotassium phosphate and 1.2g/L of magnesium sulfate. Component B includes 32g/L of yeast extract and 20g/L of ammonium sulfate. Component C includes 0.6g/L of calcium chloride. Mixing component A, component B and component C into sterile pot. Sterilization is performed to the obtained material at 120 degrees C. Cooling the obtained material. Activating yeast rehydration in 15-20 minutes. Mixing the obtained culture medium and activating yeast. Adding 500ml of distilled water into the obtained broth. Adding membrane to the obtained broth. Fermentation is performed at 35 degrees C for 19 hours. Separating the obtained fermented material through vacuum pump by using membrane. Recovering the obtained liquid. Collecting the obtained liquid at an interval of 2 hours. Measuring alcohol content of the obtained liquid by using Abbe refractometer. Collecting the obtained fermented liquid. Removing the membrane from the fermented broth. Filtration is performed to the obtained fermented broth by suction. Distillation is performed to the obtained broth for removing yeast and other impurities, which are measured through Abbe refractometer.