3) Distillation of a binary mixture and comparisons of methods. We wish to separate a mixture of 55.0% mole benzene and 45.0% mole n-heptane in a distillation column with a partial reboiler and a...

Separation Process Question

Extracted text: 3) Distillation of a binary mixture and comparisons of methods. We wish to separate a mixture of 55.0% mole benzene and 45.0% mole n-heptane in a distillation column with a partial reboiler and a total condenser. The feed rate is 1000 mol/h, and feed is a saturated vapor. We desire a distillate product of 99.6% mole benzene and a bottoms product that is 10.0% mole benzene. Reflux is a saturated liquid, and CMO can be used. Equilibrium data can be approximated with an average relative volatility of 1.32 (benzene is more volatile component). Note: Can also use (check) Raoult's Law models as another method. a) Find the minimum external reflux ratio. b) Use the Fenske equation to find the number of stages required at total reflux. c) Estimate the total number of stages required for this separation, using the Gilliland correlation for R = 1.2 Rmin.