Preparation of ethanol through continuous fermentation-pervaporation membrane separation-fractional condensation integration process
In the study,an integrated system was developed for the production of bioethanol by combining cassava continuous fermentation,pervaporation membrane separation and fractional condensation.Membrane separation can mitigate ethanol product inhibition.In the fermentation time of 500 h,total sugar consumption per unit volume of fermentation broth,average sugar consumption rate,ethanol production and ethanol productivity were 420.9 g/L,1.92 g/(L·h),165.3 g/L and 0.81 g/(L·h),respectively.The fermentation waste water to be treated was reduced by 47.3％compared with conventional continuous fermentation.The average membrane flux and separation factor were 654.3 g/(m2·h)and 8.2,respectively,with an ethanol concentration of 18.8％in the permeate.During the whole fermentation process,88.2％of the total ethanol was collected in form of high-concentration ethanol solution by pervaporation.The average ethanol concentration in the secondary condenser increased to 26.5％after the permeate vapor on the downstream of the membrane was refined by fractional condenser.
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