A cellulose acetate membrane to be used at 25 C for a KCl feed solution containing 2.5 g KCl/L has a water permeability constant of Aw= 4x10-4 kg/sm2 atm and a KCl permeability constant of As= 5.4x10-7 m/s.

KCl concentration in permeate solution was measured as 0.32 g/L (Assume that KCl concentration is very low in permeate, if necessary).

Calculate the mass flow rate of water and KCl and rejection (R) through the membrane at P=10 atm.

Molar mass of KCl= 74,5 kg/kmol; density of water ()= 999kg/m3 ; gas constant(R)=0,082 atm.L/mol.K ; membrane area= 2x10-3 m2 )