: Activity Coefficients (UNIFAC)

A UNIFAC description is available in the German and English Wikipedia.

This page uses the latest available parameters from Wittig R., Lohmann J., Gmehling J., "Vapor-Liquid Equilibria by UNIFAC Group Contribution. 6. Revision and Extension", Ind.Eng.Chem.Res., 42(1), 183-188, 2003 (available online).

New, updated and optimized parameters for UNIFAC, modified UNIFAC (Dortmund) and PSRK are available to
UNIFAC Consortium members only. The Consortium mod. UNIFAC parameter matrix contains more than 1300 parameter pairs compared to about 650 published group interactions. A large part of the published parameters have been revised within the Consortium.