Flash Separations: Example Problems

Try to solve these problems before watching the solution screencasts.

Example Problem 1

A 50/50 binary liquid mixture of benzene(1) and toluene(2) is flashed to 1.4-bar pressure, and 25% of the liquid vaporizes:

What is the composition of the resulting vapor?

Example Problem 2

A liquid that is 60% component 1 and 40% component 2 is flashed to 1210 kPa. The outlet temperature is 150ºC. The saturation pressures in kPa are:

 (T in ºC)

Calculate the fraction of effulent that is liquid and the compositions of the liquid and vapor phases. Assume the liquid is ideal.