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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 mixture of water and n-butanol is being processed in an enriching column coupled to a total condenser and a liquid-liquid settler. The feed is a saturated vapor that is 28 mol% water. Feed rate is 100 kmol/h. The distillate product is the water phase from the liquid-liquid settler. The butanol phase in the settler is refluxed to the enriching column as a saturated liquid. Operation is at 1.0 atm and CMO is valid. An external reflux ratio of L/D = 4.0 is used. Equilibrium data are in Table 8-2.

a. Find the mole fraction water in the bottoms product.

b. How many equilibrium stages are needed?

Table 8-2. Vapor-liquid equilibrium data for water and n-butanol at 1 ...

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