The design characteristic used to demonstrate the voltage and current capacity of a battery.

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2- An inlet water solution of 100 kg/h containing 0.010 wt fraction nicotine (A) in water is stripped with a kerosene stream of 200 kg/h containing 0.0005 wt fraction nicotine in a countercurrent-stage tower. The water and kerosene are essentially immiscible in each other. It is desired to reduce the concentration of the exit water to 0.0010 wt fraction nicotine. Determine the theoretical number of stages needed. The equilibrium data are as follows, with x the weight fraction of nicotine in the water solution and y in the kerosene: X y X y 0.001010 0.000806 0.00746 0.00682 0.00246 0.001959 0.00988 0.00904 0.00500 0.00454 0.0202 0.0185

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Chapter 17, Problem 2SA

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The design characteristic used to demonstrate the voltage and current capacity of a battery.

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2- An inlet water solution of 100 kg/h containing 0.010 wt fraction nicotine (A) in water is stripped with a kerosene stream of 200 kg/h containing 0.0005 wt fraction nicotine in a countercurrent-stage tower. The water and kerosene are essentially immiscible in each other. It is desired to reduce the concentration of the exit water to 0.0010 wt fraction nicotine. Determine the theoretical number of stages needed. The equilibrium data are as follows, with x the weight fraction of nicotine in the water solution and y in the kerosene: X y X y 0.001010 0.000806 0.00746 0.00682 0.00246 0.001959 0.00988 0.00904 0.00500 0.00454 0.0202 0.0185

3- An aqueous feed solution of 1000 kg/h of acetic acid-water solution contains 30.0 wt % acetic acid and is to be extracted in a countercurrent multistage process with pure isopropyl ether to reduce the acid concentration to 2.0 wt % acid in the final raffinate. a. Calculate the minimum solvent flow rate that can be used. b. If 2500 kg/h of ether solvent is used, determine the number of theoretical stages required. Water Layer (wt %) Isopropyl Ether Layer (wt %) Acetic Acid Water Isopropyl Ether Acetic Acid Water Isopropyl Ether 0 98.8 1.2 0 0.6 99.4 0.69 98.1 1.2 0.18 0.5 99.3 1.41 97.1 1.5 0.37 0.7 98.9 2.89 95.5 1.6 0.79 0.8 98.4 6.42 91.7 1.9 1.93 1.0 97.1 13.30 84.4 2.3 4.82 1.9 93.3 25.50 71.1 3.4 11.40 3.9 84.7 36.70 58.9 4.4 21.60 6.9 71.5 44.30 45.1 10.6 31.10 10.8 58.1 46.40 37.1 16.5 36.20 15.1 48.7

1- Pure isopropyl ether of 450 kg/h is being used to extract an aqueous solution of 150 kg/h with 30 wt % acetic acid (A) by countercurrent multistage extraction. The exit acid concentration in the aqueous phase is 10 wt %. Calculate the number of stages required. Water Layer (wt %) Isopropyl Ether Layer (wt %) Acetic Acid Water Isopropyl Ether Acetic Acid Water Isopropyl Ether 0 98.8 1.2 0 0.6 99.4 0.69 98.1 1.2 0.18 0.5 99.3 1.41 97.1 1.5 0.37 0.7 98.9 2.89 95.5 1.6 0.79 0.8 98.4 6.42 91.7 1.9 1.93 1.0 97.1 13.30 84.4 2.3 4.82 1.9 93.3 25.50 71.1 3.4 11.40 3.9 84.7 36.70 58.9 4.4 21.60 6.9 71.5 44.30 45.1 10.6 31.10 10.8 58.1 46.40 37.1 16.5 36.20 15.1 48.7