study provided a solution to this problem. Although Wang et al. (2013) reported that an ethanol yield of approximately 87% and a residual sugar concentration of roughly 1.8 g/L could be obtained by performing continuous ethanol fermentation of sucrose medium at 35 ◦C with flocculating yeast, multistage fermenters were used and the productivity was lower, being 7.5 g/L/h.