Answer Happy

Problem 12.7-6. Extraction with Immiscible Solvents. A water solution of 1000 kg/h containing 1.5 wt% nicotine in water is stripped with a kerosene stream of 2000 kg/h containing 0.05 wt% nicotine in a countercurrent stage tower. The exit water is to contain only 10% of the original nicotine, i.e., 90% is removed. Use equilib- rium data from Example 12.7-3. Calculate the number of theoretical stages needed. Problem 12.7-7. Analytical Equation for Number of Stages. Example 12.7-3 gives data for ex- traction of nicotine from water by kerosene where the two solvents are immis- cible. A total of 3.8 theoretical stages were needed. Use the analytical equations (10.3-21) (10.3-26) to calculate the number of theoretical stages and compare with the value obtained graphically.