I use Chemsep as an external property package within Coco.
Within Chemsep I have specified Prausnitz (K-value), Hayden O'Connel(EOS), NRTL(Activity Coefficient) and Excess Enthalpy to get reasonable enthalpy-values for methanol and water
between 1-20 bar.
However, the calculated pure component steam pressures (dependent on temperature) do not match to empirical data (p as a function of T).
Therefore I fit the Extended Antoine parameters to empirical data and want to adjust the Extended Antoine parameters within Chemsep.
However, I'm unable to do that. Whenever I change one of the parameters, it switchs back to the original value after pressing enter.
Can those Extended Antoine parameters be changed at all within Chemsep when using Prausnitz?