Plot VLE w/Wilson, Margules & van Laar: How To & Example

[scott_for_the_game]

Using the equations Wilson’s, Margules’, and van Laar’s, plot the predicted VLE for this system at this temperature, with and without the use of fugacity coefficients.

Anyone know how to do this or can explain to me how to do VLE. Or have a link for a worked example.

Cheers.

 

[berkeman]

This is a double-post, so I'm locking this thread but leaving it here temporarily as a pointer to Scott's other thread in the Homework forums.

https://www.physicsforums.com/showthread.php?t=140818

 

[ravenprp]

Vapor-liquid equilibrium (VLE) is an important thermodynamic concept that describes the equilibrium between a liquid and its vapor phase at a given temperature and pressure. The VLE behavior of a mixture can be predicted using various equations, such as the Wilson’s, Margules’, and van Laar’s equations.

To plot the predicted VLE for a system using these equations, you will first need to gather the necessary data, including the temperature, pressure, and composition of the mixture. You will also need to know the interaction parameters for the specific components in the mixture, which can be found in thermodynamic databases.

Once you have all the necessary data, you can use the Wilson’s, Margules’, and van Laar’s equations to calculate the activity coefficients of the components in the mixture. These activity coefficients can then be used to calculate the fugacity coefficients, which take into account the non-ideal behavior of the mixture.

To plot the VLE, you will need to use a phase diagram, with the liquid and vapor phases on the y-axis and the composition of the mixture on the x-axis. You can then plot the predicted VLE for the system at the given temperature, with and without the use of fugacity coefficients.

A worked example of this process can be found in thermodynamics textbooks or online resources. I recommend checking out the following link for a detailed explanation and step-by-step guide on how to plot VLE using Wilson’s, Margules’, and van Laar’s equations: https://www.engineersedge.com/thermodynamics/vapor_liquid_equilibrium.htm

I hope this helps you understand how to use these equations and plot VLE for a given system. However, it is important to note that predicting VLE is a complex process and may require additional data or assumptions. It is always best to consult with a thermodynamics expert or refer to reliable resources for accurate results.