Question 1 (20 Points) a) Explain how the liquid and vapor flow rate affect the distillation column operation and stability. b) What are the requirements for ideal absorbent? c) Explain when using packed columns are favored over tray column in distillation and absorption applications. d) Define permeability, permeance, and selectivity and permeance. kmolh C, 125 CA 25 175 sor Question 2 (25 Points) The vapor overhead of a distillation column is partially condensed and separated in a vertical flash drum ar 5 bar and 50C. Using Rachford-Rice method, calculate: a) (10 Points) The distillate flow rate and composition b) (5 Points) The distillation column reflux ratio. 2.8 c) (10 Points) The required flash drum diameter and height assuming residence time of 5 1.3 minutes and 50% liquid holdup. Assume the liquid stream has density, viscosity, and surface tension of 0.56 g/cm' 0.15 cP. and 10.5 dyne/cm. C C 04