Determine: the volumetric flow rates of permeate and retentate,concentration of the organic compounds in permeate and retentate,area of the membrane module.

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Reverse osmosis unit is to be used to clean waste solution of organic compounds. Volumetric flow rate of the waste solution is 26 m3h-1 and it contains 0.1 kmol .m-3 of organic compounds. Osmotic pressure of the solution is 0.45 MPa and a linear dependence of the osmotic pressure on the molar concentration can be assumed. The pressure difference in the membrane unit is 3 MPa. The cut fraction should be 0.4. The properties of the membrane had been obtained experimentally: resistance of th e membrane is PA/dM = 0.5 10-4 cm.MPa-1s-1 and the volumetric rejection factor is 0.9. The module is ideally mixed on both sides of the membrane.Determine: the volumetric flow rates of permeate and retentate,concentration of the organic compounds in permeate and retentate,area of the membrane module.

 

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