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25/04/2007 KMÜ 346-22 MASS TRANSFER HOMEWORK III Instructor Assistant Due Date : Prof. Dr. Zümriye Aksu : Özlem Tunç : 03/05/2007 1. A distillation column is to be designed to separate a mixture of 32mole% of ethanol and 68mole% of water into an overhead product containing 88.2mole% ethanol and a bottom product containing 90.1mole% water. The feed is entering the distillation column at 320.5 K and 1 atm pressure. The average heat capacity of the feed is 173.3kJ/kgmol.K and the average latent heat 45922 kJ/kgmol.K. The feed has a boiling point of 357.2 K. By using four times of the minimum reflux ratio, calculate the kgmol per hour distillate and kgmol per hour bottoms, the number of theoretical plates and the position of the feed plate (Use the equilibrium data for ethanol-water system from Geankoplis, App. A.3.23). 2. An aqueous feed of 800 kg/h containing 7mole% acetic acid and 93mole% water is being extracted in a countercurrent multistage extraction system using pure isopropyl ether at a rate of 2100 kg/h at 298 K. The outlet water stream contains 3wt% acetic acid. Calculate the compositions and amount of the exit extract and raffinate streams (Use the equilibrium data for this system from Geankoplis App.A.2.34). Good Luck!..