9.1 (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: les her PLO PLC Coves + - 11.369 Btu/Ibmol = 13.572 Btu/lbmol, both 2. at boiling points. +39.7 (assume constant) = 51.7 (assume constant = 27.45 + 0,08148 T - 4.538 x 10-5 TP + 10.1 x 10T Crves = 32.85 + 0,09763 T-5.716 x 10-T?+ 13.78 x 10-T where T is in C and Cpy and Cpl are Btu mol c 1bmol F Source for 2 and Cp data is Felder and Rousseau (2004). Hint: 1. Pentane recovery: 0.995 X F2p = Dxp. 2p =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 = 25C cal Or