Effect of the Pressure and Temperature on the Viscosities of two Pyrrolidinium Based Ionic Liquids

The physicochemical properties of ionic liquids (ILs), such as high thermal stability,negligible volatility, and broad liquid range, make them suitable for chemical engineeringapplications such as lubrication [1]. The analysis of the viscosity as a function of the pressureand the temperature of ILs is essential for their use as lubricants. In the present work, anequation is proposed to describe the viscosity of two pyrrolidinium-based ILs as a function ofpressure and temperature. We also determine the pressure–viscosity coefficient using theliterature viscosity data over broad pressure range for two pyrrolidinium-based ILs.