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