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Question 1: Distillation [30 Marks] A chemical engineer selected distillation as a method of separation for liquid air in an experiment. Liquid air is fed as saturated feed to a continuous distillation operated at 10 atm. Sixty % of the oxygen in the feed is to be drawn off in the hottoms product, which is to contain 0.2 mol % nitrogen. Assuming constant molar overflow equal to the moles of feed. Liquid air contains 20.9 mol % O₂ and 79.1 mol % N₂. The plate efficiency is given as 70%. The equilibrium data at 10 atm,are: Temperature, K Mole-Percent Nain Liquid Mole-Percent in app 77.35 100 100 77.98 90 97.17 78.73 79 93.62 79.44 70 90.31 80.33 60 85.91 81.35 50 80.46 82.54 40 73.50 83.94 30 64.05 85.62 20 50.81 87.67 10 31 90.17 0 0 Based on the assumptions and equilibrium data below: a. How does assuming constant molar overflow simplify your calculations? (3) b. Determine the mole % N₂ in the vapor from the top plate, (6) (12) c. Determine the number of equilibrium stages required. d. Comment on the effectiveness of this experiment. Motivate your answer using separation principles of distillation. (5) e. What indicators from your calculations and data provided show the need to further adjust the thermodynamics parameters (3) f. Which other method is suitable for the separation of liquid air? (1)