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

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D. Problems

*Answers to problems with an asterisk are at the back of the book.

D1. A simple batch distillation is done for a binary mixture of ethanol and water. The feed is 0.5 kmol of liquid that is 0.10 mole fraction ethanol. The simple batch distillation is continued until the liquid remaining in the still pot is xW,final = 0.00346 mole fraction ethanol. Find the values of Wfinal and the distillate Dtotal and the average mole fraction of ethanol in the distillate, xD,avg.

D2.* We wish to use a simple batch still (one equilibrium stage) to separate methanol from water. The feed charge to the still pot is 100 moles of a 75 mol% methanol mixture. We desire a final bottoms concentration of 55 mol% methanol. Find the amount of distillate collected, ...

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