Volumetric Behavior of 2-Methoxyethanol+1,2-Dimethoxyethane Binary Mixtures

Thermodynamic interactions in 2-methoxyethanol (component 1)+1,2-dimethoxyethane (component 2) binary mixtures have been studied in terms of the excess molar volume from the densities, measured at 19 temperatures between -10 and 80°C, for nine binary mixtures covering the whole miscibility field expressed by the mole fraction 0 ≤ X1 ≤ 1. Excess molar volumes are discussed in terms of induced conformational changes in each component in the presence of the other. The present findings support a hypothesis about the formation of a solvent-cosolvent complex species which has a well defined 1:1 stoichiometric composition and is thermostable under the experimental conditions.

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Thermophysical properties of biofuel components derived from biomass

10.51415/10321/1732 ◽

2016 ◽

Author(s):

◽

Mbalenhle B. Nduli

Keyword(s):

Refractive Index ◽

Molar Volume ◽

Binary Mixtures ◽

Thermophysical Properties ◽

Excess Molar Volume ◽

Excess Molar Volumes ◽

Isentropic Compressibility ◽

Lorenz Equation ◽

Molar Volumes ◽

Increasing Temperature

The thermophysical properties of the binary mixtures containing biofuel components derived from biomass were determined. Experimental densities, speed of sound, and refractive indices for the binary mixtures (methanol or 1-ethyl-3-methylimidazolium acetate [EMIM][OAc] + furfural or furfuryl alcohol ) were measured at T = (298.15, 303.15, 308.15, 313.15 and 318.15) K. From the experimental data, excess molar volume, E m V , isentropic compressibility, s  , molar refractions, R, and deviation in refractive index, Δn, were calculated. The excess molar volumes were found to be negative for all systems studied. The isentropic compressibility were found to be both positive for the whole composition and temperature range and increases slightly with increasing temperature. The deviation in refractive index was positive over the whole composition range. The obtained values of excess molar volumes and changes of refractive index on mixing were satisfactorily correlated by the Redlich–Kister equation. The Lorentz–Lorenz equation was applied to predict the density and calculate the excess molar volume of the binary mixtures.

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The Ethane-1,2-diol/Water Solvent System: Densities and Excess Molar Volumes at Various Temperatures

Australian Journal of Chemistry ◽

10.1071/ch9930243 ◽

1993 ◽

Vol 46 (2) ◽

pp. 243 ◽

Cited By ~ 3

Author(s):

F Corradini ◽

G Franchini ◽

L Marcheselli ◽

L Tassi ◽

G Tosi

Keyword(s):

Molar Volume ◽

Free Volume ◽

Binary Mixtures ◽

Excess Molar Volume ◽

Excess Molar Volumes ◽

Solvent System ◽

Pure Species ◽

Molar Volumes ◽

Water Solvent ◽

Aqueous Binary Mixtures

Densities (p) are presented for aqueous binary mixtures of ethane-1,2-diol at different mole fractions covering the whole miscibility field and at various temperatures (t) in the -10 ≤ t/°C ≤ +80 range. The values of the excess molar volume ( VE ) are discussed in terms of: ( i ) the influence of interactions between the components; (ii) order and degree of packing in the pure species and in the mixtures; (iii) free volume differences.

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