Water-Acetone azeotrope invented by Aspen Plus

[joseluismolto]

Hi, I need to separate water from mixture water-acetone-ethanol and Aspen Plus shows an azeotrope water-acetone that it doesnt exists. It adds me a problem... I know the azeotrope water-ethanol.

It appears with all of thermodynamic methods.

Temp (C) Classification Type No. Comp.WATER ACETONE
1 100,02 Stable node Homogeneous 1 1,0000 0,0000
2 56,14 Stable node Homogeneous 1 0,0000 1,0000
3 56,09 Unstable node Homogeneous 2 0,0213 0,9787

And if someone knows how dehydrating this mixture and how industry does it i will be thankful.

[joseluismolto]

Thanks to everyone

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[JelaniChem]

Thats Apen Plus for you. For such an expensive software, I have never done any work and get results that makes sense without regressing property parameters or binary intecation parameters. The database and termoswitches are handled very sloppily in my opinion. You will have to get your hands and experimental data and regress the parameters yourself, or check what databases are been used and see if by changing the component databases where information is been read from you find a database that has accurate binary information that gives sensible result.