It was demonstrated that non-porous membrane distillation can be used to dealcoholize beer without losing the other nutritive and flavoring components in beer such as maltose and glycerol. The results indicate that non-porous membrane distillation can be used to dealcoholize beer without losing the other nutrients and flavoring components such as maltose and glycerol. The increase of feed pressure and vacuum pressure can improve membrane flux due to higher permeability. However, membrane selectivity is decreased with the increase of vacuum pressure. The membrane flux and ethanol concentration in permeate are 0.15–0.76 L/m2 h and 3.66–4.64%-vol., respectively. Meanwhile, there are no specific sequences on the maltose concentration in the effect of operating conditions. The slight loss of maltose in the dealcoholized beer can be attributed to adsorption phenomena in membrane surface thus membrane flushing may be conducted to recover it. The glycerol behavior in dealcoholization process is similar to maltose. Some glycerol compounds are found in the permeate stream but all of them are less than 0.005%-vol. The most optimum conditions obtained from the experiment are 3000 mbar feed pressure and 580 mbar vacuum pressure, resulting 0.69 L/m2 h membrane flux, 3.70%-vol. and 4.60%-vol. ethanol concentration in beer and permeate side respectively, no maltose and only 0.001%-vol. glycerol in permeate side. A long run operation for beer dealcoholization using these operating conditions can reduce the alcohol content from 5%-vol. to 2.45%-vol. in 6 h. Analysis of concentration of some other components in the beer is essential to ensure there are not any significant changes in the beer composition. Sensory characteristics for the dealcoholized beer also have to be tested.
It was demonstrated that non-porous membrane distillation can be used to dealcoholize beer without losing the other nutritive and flavoring components in beer such as maltose and glycerol. The results indicate that non-porous membrane distillation can be used to dealcoholize beer without losing the other nutrients and flavoring components such as maltose and glycerol. The increase of feed pressure and vacuum pressure can improve membrane flux due to higher permeability. However, membrane selectivity is decreased with the increase of vacuum pressure. The membrane flux and ethanol concentration in permeate are 0.15–0.76 L/m2 h and 3.66–4.64%-vol., respectively. Meanwhile, there are no specific sequences on the maltose concentration in the effect of operating conditions. The slight loss of maltose in the dealcoholized beer can be attributed to adsorption phenomena in membrane surface thus membrane flushing may be conducted to recover it. The glycerol behavior in dealcoholization process is similar to maltose. Some glycerol compounds are found in the permeate stream but all of them are less than 0.005%-vol. The most optimum conditions obtained from the experiment are 3000 mbar feed pressure and 580 mbar vacuum pressure, resulting 0.69 L/m2 h membrane flux, 3.70%-vol. and 4.60%-vol. ethanol concentration in beer and permeate side respectively, no maltose and only 0.001%-vol. glycerol in permeate side. A long run operation for beer dealcoholization using these operating conditions can reduce the alcohol content from 5%-vol. to 2.45%-vol. in 6 h. Analysis of concentration of some other components in the beer is essential to ensure there are not any significant changes in the beer composition. Sensory characteristics for the dealcoholized beer also have to be tested.
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