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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 distillation column with two feeds is separating ethanol from water. The first feed is 60 wt % ethanol, has a total flow rate of 1000 kg/h, and is a mix of liquid and vapor at 81°C. The second feed is 10 wt % ethanol, has a total flow rate of 500 kg/h, and is liquid at 20°C. We desire a bottoms product that is 0.01 wt % ethanol and a distillate product that is 85 wt % ethanol. The column operates at 1 kg/cm2 and is adiabatic. The column has a partial reboiler, which acts as an equilibrium contact, and a total condenser. The distillate and reflux are saturated liquids. Find B and D in kg/h, and find Qc and QR in kcal/h. Use data in Figure 2-4. Do both parts a ...

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