I agree with acar,
if you plan to utilize Prode Properties multiphase flash operations with solid models
you should do data regression for best results,
differently you get the equilibrium values based on VLE BIPs
by the way Prode Properties supports multiphase for all flash operations

T-P (specified temperature & pressure)
Pf-P (specified phase fraction & pressure)
Pf-T (specified phase fraction & temperature)
V-P (specified volume & pressure)
V-T (specified volume & temperature)
H-P (specified enthalpy & pressure)
H-T (specified enthalpy & temperature)
S-P (specified entropy & pressure)
S-T (specified entropy & temperature)
V-H (specified volume & enthalpy)
V-S (specified volume & entropy)
.....
additional informations are available in operating manual,
see 'prode.com' for the details