I need to simulate a distillation column for the seperation of fatty acids at 5-15 mbar in Aspen Plus. The simulation of the column is no problem for me, but with selecting the right model and specify it, I got some problems.
For the moment I'm looking to the NRTL and UNIQUAC models, coupled with Nothnaghel or Hayden-O'Connell (this coupling for association in the vapor phase). The boiling points of the pure components and the liquid phase (with Hayden-O'Connell) are described well, but not the vapor phase (see attached picture).
Can someone help me and say what I need to do? I guess that the source of my problems is places under the Properties envoriment, Methods/Selected Methods/...
Thank u verry much