Ultrasonic speeds and isentropic compressibilities of binary mixtures of n-octane with each of the hexane isomers at 298.15 K

1987 ◽  
Vol 65 (2) ◽  
pp. 322-325 ◽  
Author(s):  
George C. Benson ◽  
Carl J. Halpin
Keyword(s):  
Binary Mixtures ◽  
Excess Molar Volumes ◽  
Ultrasonic Speed ◽  
Excess Isentropic Compressibilities ◽  
Flory Theory ◽  
Molar Volumes ◽  
Isentropic Compressibilities ◽  
Theory Of Mixtures ◽  
Derivatives Of ◽  
Good Agreement

Measurements of ultrasonic speed were carried out for n-octane + each of the five hexanes at 298.15 K. The results were combined with excess molar volumes reported previously to obtain excess isentropic compressibilities and isentropic pressure derivatives of the excess molar volumes. These are in good agreement with estimates from the Flory theory of mixtures.

Heat capacities of binary mixtures of n-octane with each of the hexane isomers at 298.15 K

1986 ◽  
Vol 64 (11) ◽  
pp. 2139-2141 ◽  
Author(s):  
George C. Benson ◽  
Patrick J. D'Arcy
Keyword(s):  
Binary Mixtures ◽  
Excess Molar Volumes ◽  
Heat Capacities ◽  
Flory Theory ◽  
Molar Volumes ◽  
Flow Microcalorimeter ◽  
Theory Of Mixtures

Volumetric heat capacities for binary mixtures of n-octane with n-hexane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, and 2,3-dimethylbutane were measured at 298.15 K in a Picker flow microcalorimeter. The results were combined with previously published excess molar volumes to obtain excess molar isobaric heat capacities. Interpretation of the results in terms of the Flory theory of mixtures is discussed.

Excess volumes of binary mixtures of n-octane with each of the hexane isomers at 298.15 K

1984 ◽  
Vol 62 (11) ◽  
pp. 2369-2371 ◽  
Author(s):  
M. K. Kumaran ◽  
George C. Benson
Keyword(s):  
Binary Mixtures ◽  
Binary Systems ◽  
Excess Molar Volumes ◽  
Excess Volumes ◽  
Excess Molar Enthalpies ◽  
Flory Theory ◽  
Molar Volumes ◽  
Theory Of Mixtures

Excess molar volumes, measured at 298.15 K in a tilting dilution dilatometer, are reported for the five binary systems formed by mixing n-octane with n-hexane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, and 2,3-dimethylbutane. The Flory theory of mixtures provides a reasonable correlation of the results in combination with excess molar enthalpies measured previously.

scholarly journals 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

2013 ◽  
Author(s):  
◽  
Sangeeta Singh
Keyword(s):  
Refractive Index ◽  
Ionic Liquid ◽  
Binary Mixtures ◽  
Binary Systems ◽  
Excess Molar Volumes ◽  
Partial Molar Volumes ◽  
Excess Properties ◽  
Excess Isentropic Compressibilities ◽  
Molar Volumes ◽  
Isentropic Compressibilities

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, E 303.15, 308.15, and 313.15) K. From the experimental data, excess molar volumes, V m , E , 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 E E E 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 present. The Redlich-Kister smoothing polynomial equation was satisfactorily applied for the E E 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.

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