ビール酵母による連続発酵 : 凝集性酵母によるエタノール生産(第1報)

概要

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Continuous ethanol fermentation by a flocculating yeast, beer yeast IFO-2018,was tested at 30℃ and pH 4.5 with uncooked molasses media in a two-tower fermentor system.Ethanol productivity was high (22 g/l・h) when the ethanol concentration produced was of 74 g/l with Phyilippine molasses medium containing 16% total sugar.With Okinawa molasses medium, the concentration of ethanol produced was about 10 g/l less than with other kinds of molasses. We think that the high ash content of Okinawa molasses inhibited the fermentation activity of this yeast.In a bench-scale fermentation test, productivity of 16.5 g/l・h was obtained at the dilution rate of 0.25 h^<-1>, but deflocculation and loss of yeast occurred in 4 days at this dilution rate, the test could not continue. Heat evolution from fermentation depended on productivity; the productivity of 26.5 g/l・h gave 6.08 kcal/l・h.
社団法人日本生物工学会の論文
1987-01-25