true multiphase gas + liquid + solid , phase equilibria in Prode Properties

[bmat]

do you have experience simulating hydrocarbons + ice / solid formation with the multiphase solver included in Prode Properties ?
I have tested Prode Properties for gas-solid equilibria (i.e. CO2 solidification) with good results,
as I understand Prode Properties includes multiphase since first editions (1996) but I have little experience with solid option.

[acar]

yes,
I have utilize PRODE PROPERTIES for multiphase with solids.
if you are going to calculate freezing points for water-alcohols such as ethanol C2H6O or methanol CH3OH
you need to regress SLE with specific data,
PRODE includes a data regression procedure for VLE-LLE-SLE data points.
when water forms a separate phase (say three phase separators) errors are not that high,
if you have water + chemicals the same as above (you may need to regress data),
a limit is that the BIPs provided with the software are for VLE and for
non-ideal mixtures (as those discussed above) you should do data regression.

[carlo.stenali]

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

[cstaff]

I agree with carlo.stenali and acar, some models such as CPA may give good results for solids with VLE BIPs but in general the best option is the do data regeression

[abarre]

I have tested Prode Properties in applications with up to 5 phases including solids and hydrates,
if you add methanol (or another inhibitor) the software is able to calculate freezing point depression,
with stanard BIPs errors with CPA model are below 1.5 degrees in the range 210-273.15 K for water + methanol) but you can easily recalculate BIPs with the VLE-LLE-SLE utility included in the software