Vapor-Solid equilibria in Prode Properties

[rense]

I am calculating vapor-solid equilibria with Prode Properties,
we have a hydrocarbon's mixture with about 6.4% CO2 (Carbon Dioxide),
which is in your opinion the best model to select for gas (and solid) fugacity,
Soave Redlich Kwong, Peng Robinson or some more complex model ?

[carlo.stenali]

you should get quite equivalent results with both Soave-Redlich-Kwong and Peng-Robinson equations of state.
There have been many discussions about which is the best model ,
I think it depends from the field of application,
some authors give criteria for selection,
for example for hydrocarbons with acentric factors < 0.3 Soave Redlich Kwong is suggested,
however this is true for standard alpha correlation, as said
with the extended version available in Prode Properties (with parameters regressed to fit vapor pressure , enthalpy and liquid density of pure components) you should get quite equivalent results.

[matrenel]

rense,
with Prode Properties you may also consider to generate a vapor-liquid-solid phase diagram (phase envelope),
this is very useful to see where the different phases (gas,liquid,solid) begin to form.