Solve Problem 3.D6 using a process simulator to find \(Q_{c}\) and \(Q_{R}\). Do a hand calculation to find the value of \(\mathrm{D}\). Then arbitrarily set \(\mathrm{N}=40\) and \(\mathrm{N}_{\text {feed }}=20\) in the process simulator and do the simulation.

D6.* A distillation column receives a feed that is 40 mol% n-pentane and 60 mol% n-hexane. Feed flow rate is 2500 lbmol/h, and feed temperature is 30C. The column is at 1 atm. A distillate that is 99.9 mol% n-pentane is desired. A total condenser is used. Reflux is a saturated liquid. The external reflux ratio is Lo/D = 3. Bottoms from the partial reboiler is 99.8 mol% n-hexane. Find D, B, QR, and Qc. Note: Watch your units on temperature. = 13,572 Btu/lbmol, both A at boiling points. = 39.7 (assume constant) Data: Ac5 = 11,369 Btu/lbmol CPL,C5 CPL,C6 CPV,C5 CPV,C6 51.7 (assume constant) = 27.45 + 0.08148 T - 4.538 10-5 T + 10.1 10-9 +3 = 32.85 + 0.09763 T-5.716 x 10-5 T + 13.78 10-9 +3 where T is in C and Cpy and CPL are cal/(molC) or Btu/(lbmolF). Assume the heat of mixing is zero. Additional data are in Table 2-7. Source for and Cp data is Felder et al. (2018).