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  1. #1

    How does HYSYS calculate Boiling Point Elevation

    I have defined CaCl2Brine properties as Hypo component (these were taken from DIPPR)

    The purpose was to have an x3 effect evaporation unit; so I had Duhring chart to know that at what temperature; mixture of a specified w.t% CaCl2 will boil.

    This binary plot was constructed using HYSYS (w.t%)

    [link Point to another website Only the registered members can access]
    If you compare this with following Duhring plot

    [link Point to another website Only the registered members can access]
    My PFD (using NRTL no BIPs)

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    You will see that HYSYS under-predicts BPE. For instance if my last effect is going to achieve 60w.t% of CaCl2 solution the temperature of that separator per Duhring is to be ~160C (ACTUALLY IT IS) but HYSYS predicts ~135C

    My question is what property while defining Hypo effects this behaviour? How can I make binary plot somewhat closer to Duhring plot?


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  3. #2

    Re: How does HYSYS calculate Boiling Point Elevation

    in my opinion to get reasonable values for any (with non-ideal fluids) separation and models based on liquid activity (NRTL etc.) you should define interaction coefficients, you can, for example, do a data regression etc. to fit some experimental values,
    for Solid Liquid Equilibria / separations I have used PRODE Properties which includes that data regression procedure, after fitting parameters (for some complex mixing rule) results are usually close to experimental values...

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