Sanchez/Lacombe

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VLXE Blend offers the two version of the Sanchez/Lacombe equation of state:

Original Sanchez/Lacombe.

Modified Sanchez/Lacombe

 

The modified version is obtained by:

Integrating the expression of P from the original

Differentiating with respect to V to get P and mole numbers to get fugacity's

 

This is not possible with the original version.

 

Since the modified version obeys an ideal gas limits i.e  P goes to zero if V goes to infinity, it is recommended to use the modified version.

 

Extensive work has been done in the polymer related field by R. A. Heideman and Ryan Krenz.

 

Note: For solvents it is possible to obtain the parameters from the critical properties and the acentric factor. This is based on work done made by R. A. Heideman & K. Gauter and is build into the user interface in VLXE Blend.

 

For more information see the references: 12, 13