Present status of the modified UNIFAC model for the prediction of phase equilibria and excess enthalpies for systems with ionic liquids

The modified UNIFAC (Dortmund) parameter matrix for ionic liquids has been extended. Two new main groups for the anions alkylsulfate [RSO4]− and hexafluorophosphate [PF6]− were introduced. Additionally new interaction parameters for pyrrolidinium [RMPYR]+ and pyridinium [RPY]+ cations as well as 1 for trifluoromethanesulfonate [OTF]− and tetrafluoroborate [BF4]− anions have been fitted to the available experimental data. In addition existing parameters have been revised. This article will give an overview about the current status of the modified UNIFAC (Dortmund) parameter matrix for ionic liquids. Typical results are presented for various systems. For the further development vapor–liquid equilibria and excess enthalpies were measured.