Pressure dependence on the viscosities of 1-butyl-2,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide and two tris(pentafluoroethyl)trifluorophosphate based ionic liquids: New measurements and modelling

► Viscosities of 3 ILs from 313.15 to 363.15 K at pressures up to 150 MPa are reported. ► Temperature and pressure correlations with modified VFT and Litovitz equations are provided. ► Local pressure-viscosity coefficient is studied for 9 ILs and other liquids. ► Density scaling concept is applied to the reduced and non-reduced viscosity for 6 ILs.