Extension of modified UNIFAC (Dortmund) matrix to piperidinium ionic liquids

In this contribution, modified UNIFAC (Dortmund) matrix for ionic liquids reported by Nebig and Gmehling [Fluid Phase Equilib. 302 (2011) 220–225] is extended. New parameters, determined on the basis of thermodynamic data extracted from literature, enable to apply the model to calculate various thermodynamic properties (limiting activity coefficients, liquid–liquid and solid–liquid equilibrium phase diagrams, and excess enthalpies) of binary systems formed by 1,1-dialkylpiperidinium ionic liquids based on bis[(trifluoromethyl)sulfonyl]imide anion and different organic solvents (n-alkane, cycloalkane, 1-alkene, benzene, thiophene, 1-alcohol), or water. It is demonstrated that the modified UNIFAC (Dortmund) group contribution method is capable of capturing those different properties with a very good accuracy.