The tower-shaped reactor for continuous ethanol fermentation with flocculating yeast strain KF-7 was somewhat similar to immobilized yeast fermentation in fluidized bed reactor. Using immobilized yeast fermentation of sweet sorghum juice in a fluidized bed reactor at 32 ◦C and a dilution rate of 0.2 h−1, ethanol yield and productivity of 91.6% and 9.9 g/L/h, respectively, were obtained by Liu et al. (2008).