Multiphase , solid solution model in Properties

[bmat]

Which are the limits of application of simplified solid solution model available in Prode Properties ?
I need to evaluate wax precipitation.

[carlo.stenali]

I assume you mean the simplified solid solution model included in base version of Prode Properties, in this model the fugacity of solid phase is calculated from liquid fugacity and dH, Petersen et al discussed applications of this model in "Wax precipitation from North Sea crude oils" which you may read for additional information.
To sum up the comments , the model overstimates the amount of wax and they suggest to introduce adjustable parameters or a correction, still it is difficult to compare results as different crude oils may show very different properties and each wax precipitation model should be corrected where possible.
If you are going to utilize the model in a professional work I would suggest to contact the developer for additional information.

[bmat]

I have a basic knowledge of standard solid solution model for fugacity,
according Firoozabadi book's it should take in account the fugacity of liquid phase, heat of fusion and liquid and solid heat capacities, I am not sure how reliable is the sofware to estimate these values, could you help ?

[carlo.stenali]

bmat,
the simplified solid solution model in Prode Properties does calculate solid fugacity in multiphase equilibria starting from liquid fugacity and correcting with heat of fusion, liquid and solid heat capacities.
These values are available in Prode Properties databank which includes data for about 1500 chemicals.
Some authors as Firoozabadi, Pedersen and others have tested the ability of the model to predict solid solutions in petroleum fractions / hydrocarbons etc. as for example wax precipitation , in those cases simplified correlations for dHf,cpl,cps can be applied.
I have not direct experience in this area but you can obtain tecnical support from developer, see below

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