A new one parameter viscosity model for binary mixtures

Viscosity of binary mixtures of 1-ethyl-3-methylimidazolium tetrafluoroborate ionic liquid with four organic solvents

“…In this paper, the one-parameter Grunberg-Nissan and Fang and He [5] and two-parameter three-body McAllister [10], Eyring-UNIQUAC [11], Eyring-NRTL [12] and Eyring-Wilson [6,13] models were used for the viscosity calculation. The common idea of these models, except GrunbergNissan, is that the classical thermodynamics can be extended to viscous flow behaviour of the liquid mixture by assuming equivalence between the Gibbs energy of activation for flow and the equilibrium Gibbs energy of mixing [11].…”

“…The literature of the last years indicates some empirical or semi-empirical viscosity models which have been applied to correlate IL-cosolvent mixtures [2][3][4][5][6][7][8][9]. Among these, the models based on Eyring's absolute rate theory and activity coefficient model has firm fundamental basis that can offer better results than the frequently used mixing rules, as Grunberg-Nissan [4][5][6][7][8].…”

“…The models tested in this work include the three body McAllister [10], Eyring-UNIQUAC [11], Eyring-NRTL [12] and Eyring-Wilson [6,13] models. In addition, we tested also the equation developed by Fang and He [5] with one parameter, which offer the advantage of being used when limited experimental results are available.…”

New method based on the UNIFAC-VISCO model for the estimation of dynamic viscosity of (ionic liquid + molecular solvent) binary mixtures

“…The authors highlighted that a better evaluation of the viscosity could be achieved by using the Eyring-UNIQUAC (RAAD% of 2.6%) than by using Eyring-NRTL (RAAD% of 3.5%). Bajić et al [6] [7] proposed a method based on the Eyring's absolute reaction rate theory, which was coupled with the Flory-Huggins equation, to estimate the viscosity of 527 binary mixtures including 63 (IL + solvent) mixtures. The RAAD% of the proposed method assessed using 2554 data points of the 63 ionic liquid containing systems is close to 3.73% which shows a better viscosity predictive capability than the Grunberg-Nissan equation ( 4 ] + ethylene glycol, the best result was reported using the Eyring-Flory-Huggins based method with a RAAD% of 1.54%, while the McAllister method also showed a good result with RAAD% of 1.60%.…”

“…[8], Eyring-Flory-Huggins [7], and Eyring-Wilson models [13]; and (iii) predictive methods, for example, UNIFAC-VISCO [6] and ASOG-VISCO models [6].…”