10.03 - Binary VLE using Raoult's Law

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Raoult's Law (5:39) (msu.edu)
What type of components make an ideal solution that follows Raoult's Law? What does a diagram look like for a system that follows Raoult's Law? Can you identify the regions? What is the K-ratio for Raoult's Law? What simple principles must be followed for the K-ratios of the components in a binary mixture?

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Raoult's Law Calculation Procedures (11:45) (msu.edu)
Details on how to implement bubble, dew, and flash calculations for Raoult's Law. This screencast shows sample calculations for the bubble pressure and dew pressure of methanol+ethanol.

Comprehension Questions: Assume the ideal solution SCVP model (Eqns. 2.47 and 10.8).

1. Estimate the bubble pressure (bars) of 30% acetone + 70% benzene at 333K.
2. Estimate the dew temperature (K) of 30% acetone + 70% benzene at 1 bar.
3. Estimate the fraction vapor and phase compositions ethylamine+ethanol at 298K, 400mmHg and a feed of 60%amine.

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This screencast shows binary bubble, dew, and flash sample calculations (uakron, 19min) for methanol and ethanol. It complements the previous video by showing how the bubble and dew pressures relate to the Pxy diagram. It supplements the previous video with examples of numerical results for the bubble and dew temperatures. An isothermal flash calculation requires a different approach, but it also encompasses the bubble and dew temperature and pressure calculations. In a flash calculation, the bubble result is recovered when V/F = 0. The dew result is recovered when V/F=1.

Comprehension Questions (Assume the ideal solution SCVP model.):

1. Estimate the bubble pressure (mmHg) and vapor composition of methanol+ethanol at 50 C and xM = 0.4. (Note that the SCVP model should be used now.)
2. Estimate the dew temperature (C) and vapor composition of methanol+benzene at 50 C and yM = 0.4.
3. Estimate the vapor fraction and vapor/liquid compositions of methanol+benzene at 50 C, 355mmHg, and zM = 0.45.
4. Estimate the vapor fraction and vapor/liquid compositions of methanol+benzene at 50 C, 365mmHg, and zM = 0.45. (Hint: think carefully.)

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