Consider a continuous countercurrent dialysis system that uses a flat membrane with a width of 25 cm and a permeability of 1/3 cm/min. The raffinate and permeate feeds are 300 mL/min and 900 mL/min, respectively. The required separation factor is 7.24. What is the required length? Discuss the result in the context of your solution to part c of problem 5.3.

problem 5.3

Consider a dialysis system in which the membrane has a permeability of 1/3 cm/min and the total available membrane area is 2,700 cm². The raffinate feed rate is 300 mL/min and the total permeate flow available is 900 mL/min. Compare the separation factors for the following cases: (a) A single stage;

(b) A nine-stage crossflow configuration;

(c) A nine-stage countercurrent configuration.