Elementary Principles 450 - 10.2 10 variables n1 , n2 , n3...

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10- 2 10.2 10 2 21 1 6 12341234 34 3 4 variables material balances equilibrium relations: [ degrees of freedom nnnn xx xxTP xP xP T x P x P T BC ,,,,,,,, , ,] ** bg bgb g b g bg −= = a. A straightforward set : nnnxxT 13414 ,,,,, lq Calculate n 2 from total material balance, P from sum of Raoult's laws: Px pT xPT Bc =+ ∗∗ 44 1 bg b x 3 from Raoult's law, x 2 from B balance b . An iterative set : nnnxxx 12312 3 Calculate n 4 from total mole balance, x 4 from B balance. Guess P, calculate T from Raoult's law for B, P from Raoult’s law for C , iterate until pressure checks. c . An impossible set : nnnnTP 1234 ,,,, , Once nn n 12 3 ,, and are specified, a total mole balance determines n 4 . 10.3 2BaSO s 4C s 2BaS s 4CO g 42 b g +→ + a
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