Two-component UNIFAC

"UX be damned"

Solute mole fraction
Temperature (K)

ln combinatorial
ln residual
activity coefficient


Note there is/are some bug(s) somewhere that cause NaNs to show up for higher group numbers. I don't have the wherewithall to find the problem, but the calculator currently reproduces the practice example from page 8.77 of The Properties of Gases and Liquids, 5th Edition by Poling, Prausnitz, and O'Connell. Use at your own risk, or debug yourself!