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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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D. Problems

D1. We have steady-state diffusion of 1-propanol across a liquid water film that is 0.10 mm thick. On one side of the film the 1-propanol concentration is 1.2kg/m3. We desire a 1-propanol flux rate of 0.2 × 10–5kg/(m2s). The apparatus is at 25°C.

a. * What is the concentration at the other side of the film? Depending on the direction of transfer, there are two answers.

b. What are the equations for the concentration profiles?

Diffusivity value is given in Table 15-3.

D2. For the same system as in Problem 15.D1, we want the high concentration CA,0 = 1.2 kg/m3 and the same value of CA,L ( = 0.9701) as in Problem 15.D1, but we want a flux rate = 0.35 × 10–5kg/(m2s). The apparatus temperature can be adjusted. The Fickian infinite dilution ...

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