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A ternary mixture containing A, B, and C is flashed. The feed compositions of all the...

  1. A ternary mixture containing A, B, and C is flashed. The feed compositions of all the species along with the feed flow rate are given. We would like to solve for V, L, yA, yB, yC, xA, xB, and xC, where y and x represent mole fractions of a given species in the vapor and liquid phase respectively. Identify the correct variables needed to completely solve the problem, so that the problem is not overspecified or underspecified. CHECK ALL THAT APPLY

A. P and xA

B. T and yB

C. P, T, and V/F

D. P, T, and yC

Engineering   Chemical-Engineering   
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Answer #1

Therefore we need three variables, so we can eliminate option (A) and (B) since they have specified only two variables.

The temperature (T) and Pressure (P) should know since they are primary parameters. After the flashing of the feed, the components in liquid and vapor phases will exist in equilibrium and those compositions can be found from the temperature and equilibrium data. The only parameter to know is the amount of liquid and vapor, which can be easily found out from the parameter "V/F".

So the correct answer id option (C) T, P, V/F.

These are the parameters needed to completely solve the problem so that it is exactly specified (not overspecified and not underspecified).

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