Fluid Phase Equilibria, Vol.394, 156-164, 2015
Measurements of the liquid-liquid phase equilibria of binary solutions of 1-methyl-3-octylimidazolium tetrafluoroborate with 1-heptanol or 2-pentanol
Liquid-liquid phase equilibria of binary solutions of the room temperature ionic liquid (RTIL) 1-methyl-3-octylimidazolium tetrafluoroborate ([C(8)mim][BF4]) with 1-heptanol or 2-pentanol were measured. The critical exponents beta obtained from the liquid-liquid equilibrium data in the critical region were consistent with the 3D-Ising value, which confirmed the 3D-Ising criticality of the investigated binary ionic solutions. The asymmetry of the diameters of the coexistence curves was analyzed by the complete scaling theory, indicating a significant contribution of the heat capacity related term. The RPM (restricted primitive model)-rescaled critical parameters were calculated, which showed dual characters of both solvophobic and coulombic criticalities of the studied binary ionic solutions. (C) 2015 Elsevier B.V. All rights reserved.