Density and Molar Volumes of 1-Butyl-3-methylimidazolium trifluoromethanesulfonate and Methanol Mixtures at Ambient and Saturated Pressures

In this work, we present the density of 1-butyl-3-methylimidazolium trifluoromethanesulfonate and methanol binary mixtures {(1 - x)CH3OH + x[BMIM][TFO]}, at ambient and saturated pressures rho(p(0 or) (s), T, w)/kg.m(-3), temperatures of T = (278.15 to 413.15) K, and w = (0 to 100) mass percent [or x = (0 to 1) mole fr.]. Measurements were made with an estimated Delta rho/rho = +/- 0.03 % average percent deviation and were carried out using two different densimeters from the Anton Paar company. The obtained values were fit to the polynomial equation and used to calculate the excess V-m(E)/cm(3).mol(-1) and apparent molar volumes V-phi/cm(3).mol(-1) of the investigated binary mixtures. The obtained excess molar volumes V-m(E) were fit to the Redlich-Kister equation. Partial molar volumes ((V) over bar (m,i)) and excess partial molar volumes ((V) over bar (E)(m,i))used to gain insight into solute-solvent interactions-were calculated from the excess molar volumes. The apparent molar volumes of the investigated aqueous and non-aqueous salt solutions in the solvent were defined.

Automated summary

In this study, we measured the density of 1-butyl-3-methylimidazolium trifluoromethanesulfonate and methanol binary mixtures at different temperatures and mass percentages. The obtained values were used to calculate the excess molar volumes and apparent molar volumes of the mixtures. By calculating the excess molar volumes, we gained insight into the solute-solvent interactions.