Modeling Viscosity of Ionic Liquids and Akanolamines Mixtures Using Peng-Robinson and Soave-Redlich-Kwong Equation of States with Friction Theory

 Solvents are compounds that are used in the chemical, pharmacy, oil and gas industries, including in separation processes. These solvents include alkanolamines and ionic liquids (ILs). ionic liquids with a melting point below 100oC are a particular class of chemical compounds that have unique properties and characteristics. Design and optimization of acid gases removal systems and separated CO2 from the gas stream requires experimental data of physical properties, However, performing an experiment is time consuming and costly. Therefore, thermodynamic models are used to predict the properties of pure and mixture materials.

 In this study viscosities of 3 alkanolamines (Monoethanolamide (MEA), N-Methyldiethanolamine (MDEA), Diethanolamine (DEA)) and 12 ionic liquids based on imidazolium (imidazolium based families of tetrafluoroborate, hexafluorophosphate and bis[(trifluoromethyl)sulfonyl]imide) were investigated by the well-known friction theory (FT) based on friction concepts of classical mechanics was coupled with two simple cubic equation of state (EoS) of the Soave-Redlich-Kwong (SRK) and Peng-Robinson(PR) at over wide ranges of temperatures and pressure and in different mole fraction (for mixture) for prediction of viscosity. The models presented in this work are based on the viscosity behavior of pure alkanolamines and ionic liquids.

The result shows friction theory has good operation in prediction of viscosity. The average absolute Relative deviation (AARD) is 4.71% and 1.66% for pure ILs and alkanolamine respectively when PR equation state is used and when SRK equation of state is used these values is 4.70% and 1.99% about IL-IL mixture, experimental and predicted values were well matched and for IL-alkanolamine mixture FT5- and FT6- have best result.