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Title: Correlation and prediction of the physical and excess properties of the ionic liquid 1-butyl-3-methylimidazolium methyl sulphate with several alcohols at T= (298.15 to 313.15) K
Authors: Singh, Sangeeta 
Issue Date: 30-Jul-2013
The thermodynamic properties of binary liquid mixtures using an ionic liquid (IL)
with alcohols were determined at different temperatures. The ionic liquid used was 1-butyl-3-
methylimidazolium methylsulphate [BMIM]+[MeSO4]-. Densities, speed of sound, and refractive
indices for the binary mixtures ([BMIM]+[MeSO4]- + methanol, or 1-propanol, or 2-propanol, or
1-butanol) were experimentally measured over the whole range of composition at T = (298.15,
303.15, 308.15, and 313.15) K. From the experimental data, excess molar volumes, V m ,
, deviations in refractive
isentropic compressibilities, κ s , excess isentropic compressibilities, κ S
indices, ∆n, and molar refractions, R, were calculated. The excess partial molar volumes were
also calculated at T = 298.15 K.
For the binary systems, ([BMIM]+[MeSO4]- + methanol, or 1-propanol, or 2-propanol, or
1-butanol) V m and κ S
are always negative and V m decrease slightly when the temperature
increases. The refractive index deviation at T = (298.15, 303.15, 308.15, and 313.15) K is
positive over the whole composition range. The measured negative values for excess molar
volume of these mixtures ([BMIM]+[MeSO4]- + methanol, or 1-propanol, or 2-propanol, or
1-butanol) indicate strong ion-dipole interactions and packing between alcohols and IL are
The Redlich-Kister smoothing polynomial equation was satisfactorily applied for the
fitting of the V m , κ S
, and ∆n data to give the fitting parameters and the root-mean-square
deviations. The Lorentz-Lorenz (L-L) equation was also used to correlate the volumetric
property and predict the density or refractive index of the binary mixtures of ionic liquid and the
organic solvents. The Lorentz-Lorenz approximation gives a higher σ when used to correlate the
iiiexcess molar volumes for the mixtures ([BMIM]+[MeSO4]- + methanol, or 1-propanol, or
2-propanol, or 1-butanol). The L-L equation gives good results for the prediction of density and
refractive index. The results are discussed in terms of solute-solute, solute-solvent and solvent-
solvent interactions.
Submitted in fulfilment of the academic requirements for the Masters Degree in Technology: Chemistry,
Durban University of Technology, Durban, South Africa, 2013.
Appears in Collections:Theses and dissertations (Applied Sciences)

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