1. An ethanol water mixture is to be separated in a distillation column which has a total condenser and a partial reboiler. Feed is 50% by weight ethanol and enters as a two-phase mixture at 85C. Feed rate is 2050 pounds/hr. We desire a bottom product that is 5 wt% ethanol. A distillate composition that is 90wt.% ethanol is desired. The reflux is returned to the columun as a subcooled liquid at -20C. Column pressure is 1 kg/cm3. (a) If an external reflux ratio of L/D-2.0 is used to find the optimum foed location and the number of equilibrium stages required. Use the Poncho-Savarit technique to solve this problem. Data is in Figure 2-4. (b) Determine the mumber of actual stages required for an overall efficiency, Eo, of 0.75 tacthangl from