Excel library for process calc's including distillation

[dbert]

interesting evaluation,
if I may add a note I think there is an error in mixture with 80% CH4 and 20% C10H22, for this mixture Prode Properties calculates the attached phase envelope,

Pc 240 Bar
Tc 497K
Cricondenbar 320 Bar
Cricondentherm 545 K

your test conditions are outside the VLE area (above cricondenbar) so I expect all liquid or all gas (you may add the test for isothermal compressibility),
kindly advise if I am wrong.