Ternary Excess Molar Volumes of {Methyltrioctylammonium Bis[(trifluoromethyl)sulfonyl]imide + Methanol + Methyl Acetate or Ethyl Acetate} Systems at (298.15, 303.15, and 313.15) K

摘要

The densities of the ternary systems {methyltrioctylammonium bis[(trifluoromethyl)sulfonyl]imide + methanol + methyl acetate or ethyl acetate) have been measured at the temperatures (298.15, 303.15, and 313.15) K. The ternary excess molar volumes,V_(123)~E, were calculated from the experimental densities at each temperature. The V_(123)~E values are negative for all mole fractions of the ionic liquid (IL). For the system {[MOA]~+[Tf2N]~-+ methanol + methyl acetate}, the minimum ternary excess molar volumes, V_(123,min)~E decrease with decreasing z values (increasing the mole fraction of the IL) except at z equal to 0.30 at temperatures (298.15 and 313.15) K. The V_(123,min)~E decreases with an increase in the temperature. For the system {[MOA]~+[Tf2N]~- + methanol + ethyl acetate}, V_(123,min)~E increases with decreasing z values at each temperature. The Cibulka equation was used to correlate the ternary excess molar volume data from the Redlich-Kister parameters obtained from fitting the Redlich-Kister equation to the five binary systems obtained from the literature. There is a good correlation between the Cibulka equation and experimental V_(123)~E data.