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

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E. More Complex Problems

E1. A mixture of methanol and water is being separated in a distillation column with open steam (see figure in Problem 3.D2). The feed rate is 100 kmol/h. Feed is 60.0 mol% methanol and is at 40 °C. The column is at 1.0 atm. The steam is pure water vapor (yM = 0) and is a saturated vapor. The distillate product is 99.0 mol% methanol and leaves as a saturated liquid. The bottoms is 2.0 mol% methanol and, since it leaves an equilibrium stage, must be a saturated liquid. The column is adiabatic. The column has a total condenser. External reflux ratio is L/D = 2.3.

Equilibrium data are in Table 2-7 in Problem 2.D1. Data for water and methanol is available in Felder and Rousseau (2004) (CP, λ and steam tables) and in Perry’s. ...

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