Elementary Principles 322 - 8.66 a. Basis: 1 mol feed/s n V...

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8- 43 8.66 a. Basis: 1 mol feed/s 1 mo l/s @ T F o C x F mol A/mol (1-x F ) mol B/mo l n V mol vapor/s @ T, P y mol A/mol (1-y) mol B/mol n L mol vapor/s @ T, P x mol A/mol (1-x) mol B/mo l vapor and liquid streams in equilibrium Raoult's law ⇒⋅ + − ⋅ = ⇒= ∗∗ xp T x p T P x PpT pT pT AB B bg b g bg 1 (1) py P x p T y P AA A =⋅=⋅ ⇒= (2) Mole balance: 11 =+⇒ = ±± ± ± nn n n LV V L (4) A balance: xy n x n n yx FV L n L F b g 1 =⋅ +⋅ ⎯ ⎯⎯⎯⎯⎯⎯ ⎯= ± Substitute for from (4) v (3) Energy balance: Δ ± ± ² ± ² Hn H n H ii =−= out in 0 (5) b. Tref(deg.C) = 25 Compound A B C al av bv Tbp DHv n-pentane 6.84471 1060.793 231.541 0.195 0.115 3.41E-04 36.07 25.77 n-hexane
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