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[bponcet]

I have to solve (a series of) flash operations (specified H, P or T, P) for mixtures of hydrocarbons + water + methanol etc.,

I wish to evaluate formation of solid phases such as ice, hydrates etc.

for hydrates the manual includes an example based on CPA but for other fluids ?

Should I select the pure solid model based on CPA (as for the example included in manual) or the solid solution model ?

Any help from experts of this software ?

[marchem]

for VLSH operations (vapor+liquid+solid+hydrate) for solid phase you must select a "solid pure model",

in Base version there are CPA (SPM-CPA), PR-Extended (SPM-PRX), PR-Extended NRTL WS (SPM-PRN) etc.

note that each solid model requires to select the equivalent model for hydrates (differently you may get large errors),

to get accurate values in presence of inhibitors make sure that BIPs are correct .... (best option :  regress LLE data with the utility available in Prode)

as far as I know the solid solution models are good for mixtures of hydrocarbons...