Butanol is extracted from the fermentation broth using an organic solvent in a countercurrent extraction unit. Partition coefficient of butanol between organic solvent and broth at pH 6.0 is...

Butanol is extracted from the fermentation broth using an organic solvent in a countercurrent extraction unit. Partition coefficient of butanol between organic solvent and broth at pH 6.0 is P=Corg/Cbroth =40. The flow rate of broth is 10 L/min. If five equal volume extraction units are available to reduce the butanol concentration from 20 g/L to 0.2 g/L in the broth (aqueous phase), please determine the flow rate of organic solvent (organic phase) as well as the size of each extraction unit.