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ChemE_140_midterm3

ChemE_140_midterm3 - Chemical Engineering 140 Midterm 3(100...

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Chemical Engineering 140 November 22, 2004 Midterm # 3 (100) 1. It is desired to remove continuously a contaminant, acetic acid, from a wastewater stream. It has been proposed to use isopropyl ether in a liquid-liquid extraction scheme to remove the contaminant. The feed wastewater stream has a flow rate of 1000 mol/min and contains15 mol % acetic acid. The amount of acetic acid must be reduced by 98%. Assume isopropyl ether is completely immiscible in water. The partition coefficient of acetic acid for this system, K A , is not a constant over all mole fractions. Equilibrium data are plotted in Figure 1. Mole Fractions of acid in water and ether y = 0.7374x 2 + 0.2594x R 2 = 0.9999 0 0.05 0.1 0.15 0.2 0.25 0 0.02 0.04 0.06 0.08 0.1 x A (in water phase) y A (in ether phase) Figure 1: Acetic acid, water, isopropyl ether equilibrium data (10) (a) Using the equation of the trend line given in Figure 1, what is K A (x A )? (30) (b) Using a single equilibrium stage, what must the solvent flow rate be in order to achieve the desired separation? Assume that the acetic acid is dilute such that the overall water and isopropyl ether flow rates do not change.
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