Elementary Principles 207 - 6.59 a. Basis: 150.0 L/s vapor...

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6- 41 6.59 a. Basis : 150.0 L/s vapor mixture Gibbs phase rule: F=2+c- =2+2-2=2 π Since the composition of the vapor and the pressure are given, the information is enough. Equations needed : Mole balances on butane and hexane, Antoine equation and Raoult’s law for butane and hexane b. 0 150.0 L 273 K mol Molar flow rate of feed: n 4.652 mol/s s 393 K 22.4 L (STP) == ± 6.82485 943.453/( 239.711) 2 Raoult's law for butane: 0.600(1100)=x 10 (1) T −+ 6.88555 1175.817/( 224.867) 2 Raoult's law for hexane: 0.400(1100)=(1-x ) 10 (2) T 12 2 Mole balance on butane: 4.652(0.5)=n 0.6 n x (3) +⋅ ±± 2 Mole balance on hexane: 4.652(0.5)=n 0.4 n (1 x ) (4) +⋅− c. 1100(0.6) 1100(0.4) From (1) and (2), 1= 943.453 1175.817 10**(6.82485 ) 10**(6.88555 ) 239.711 224.867 TT + −− ++ ⇒° T=57.0 C 2 6.82485 943.453/(57.0 239.711) 1100(0.6) 0.149 mol butane /mol
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