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b. Your team has been assigned to evaluate the performance of a new type of membrane...
1.Find membrane area to separate air using a membrane 0.002 cm thick with oxygen permeability P =400x10cm3(STP)cm/(s.cm2.cmHg) and α*=8 for permeability ratio of oxygen and nitrogen. Feed rate, qf=10cm/s and θ=0.3; Pr=150 cm Hg and P=10 cm Hg. Assume complete mixing model, calculate permeate composition, reject composition and membrane area.
Membrane Separation II Reverse Osmosis (a) Derive van't Hoff's equation (osmotic pressure π-CRT). (b) A feed solution containing 5g NaCl/L (ρ-1001kg/m3) is purified using a reverse osmosis system. Water permeability constant (Aw) and a solute (NaCI) permeability constant (As) are 5 x 10 kg/m2s atm, and 4 x 10-7m/s, respectively. AP 30 atm. Assume that the fraction recovered of the solvent water is 0.15. The flow rate q2 of the permeate water solution is 50 L/min. Calculate ci and c2...