Q.1 (4.0 Marks) A distillation column operating at 2.0 atm. is separating a feed that is 60.0 mol% n- pentane and 40.0 mol% n-hexane. The feed is at 65 C, and its flow rate is 1000 kmol/h. The distillate is 99.93 mol% n-pentane, and we want a 99.50% recovery of n- pentane in distillate. The system uses a total condenser, and reflux is a saturated liquid with an external reflux ratio of L/D = 3.0. There is a partial reboiler. Find D, B, XB, QC, QR. Data: 19 PLC = 11.369 Btu/Ibmol = 13.572 Btu/lbmol, both 7. at boiling points. PLG = 39.7 (assume constant = 51.7 (assume constant) Cpves = 27.45 + 0.08148 T - 4.538 x 10-5 T2 + 10.1 x 10-4T3 Cpvc = 32.85 + 0.09763 T-5.716 x 10-5 T2 + 13.78 x 10-4T3 where T is in C and Cpy and Cpl are cal Btu mol C 1bmol F Source for 2 and Cp data is Felder and Rousseau (2004). Hint: 1. Pentane recovery: 0.995 X FZp = Dxo. Zp =mole fraction n-pentane in feed. 2. Assume the distillate is essentially pure n-pentane and bottoms is essentially pure n-hexane. 3. Take Tref = 25 C or