PROBLEMS

13.2-1.

Diffusion Through Liquids and a Membrane. A membrane process is being designed to recover solute A from a dilute solution where c1 = 2.0 × 10-2 kg mol A/m3 by dialysis through a membrane to a solution where c2 = 0.3 × 10-2. The membrane thickness is 1.59 × 10-5 m, the distribution coefficient K' = 0.75, DAB = 3.5 × 10-11 m2/s in the membrane, the mass-transfer coefficient in the dilute solution is kc1 = 3.5 × 10-5 m/s, and kc2 = 2.1 × 10-5.

  1. Calculate the individual resistances, total resistance, and total percent resistance of the two films.

  2. Calculate the flux at steady state and the total area in m2 for a transfer of 0.01 kg mol solute/h.

  3. Increasing the velocity of both liquid phases flowing past the surface of the membrane will ...

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