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QUESTION 2 (25 marks) 50 kg/h of a liquid feed containing an equimolar mixture of n-Hexane and n-Heptane enters a flash drum which operates at 1.10 atm and 38 C. The liquid and vapour streams leaving the flash drum are in equilibrium. The vapour product stream contains 60 mol% n-Hexane and 40 mol% n-Heptane. (a) Draw a fully labelled process flow diagram. Indicate clearly all information related to the various streams. (4 marks) (b) Determine the operating temperature of the flash drum using Raoult's law and molar composition of the liquid stream leaving the flash drum. (Your answer must be within 11.0 % error.) (12 marks) (c) Calculate the mole ratio of the liquid to vapour flowrate leaving the flash drum. (6 marks) QUESTION 2 (25 marks) 50 kg/h of a liquid feed containing an equimolar mixture of n-Hexane and n-Heptane enters a flash drum which operates at 1.10 atm and 38 C. The liquid and vapour streams leaving the flash drum are in equilibrium. The vapour product stream contains 60 mol% n-Hexane and 40 mol% n-Heptane. (a) Draw a fully labelled process flow diagram. Indicate clearly all information related to the various streams. (4 marks) (b) Determine the operating temperature of the flash drum using Raoult's law and molar composition of the liquid stream leaving the flash drum. (Your answer must be within 11.0 % error.) (12 marks) Calculate the mole ratio of the liquid to vapour flowrate leaving the flash drum. (6 marks) (c) (d) Calculate the percentage of n-Heptane from the feed leaving in the liquid stream. (3 marks) Additional data: n-Hexane: log10 p = 6.88555 1175.817 T +224.867 n-Heptane: log10 p* = 6.90253 1267.828 T + 216.823 (p* in mmHg, T in C) Table 2: Selected physical properties of compounds Mol. Wt. SG AA (Tm) Compound Formula AA (T) AA AA. Toloc) (g/mol) (20/4) Tm(C) kJ/mol kJ/mol kJ/mol kJ/mol n-Hexane CaH14 86.17 0.659 -95.32 13.03 68.74 28.85-198.8(U) -4163.1(1) - 167.2(9) -4194.8(9) n-Heptane C7H16 100.2 0.684 -90.59 14.03 98.43 31.69 -224.4(0) -4816.9(0) -187.8(g) -4853.5(9)