Viscosity measurements of the binary mixture ethyl lactate+acetonitrile from 283.15 to 323.15 K. Activation parameters and their connection with molecular interactions (original) (raw)
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J Chem Eng Data, 1988
Kinematic vbcorltles were m e w r e d for the mixtures ( I ) acetonltrb + methyl bommte, ( I I) acetonitrile + ethyl benzoate, (111) acetonltrlb + n-propyj benzoate, and ( I V ) acetonitrile + n-butyl benzoate at dmerent temperatures aver the enthe compodtlon range. From the experimental data, the negative excess vlscorltles, negatlve excess free energies o f actlvatlon, and podtlve excess molar volumes obtalned wggest very lnterertlng Intermokular Interactionr. The behavlor of the mlxtures is dlscusoed. Introductlon Excess thermodynamic functions have been used as a quailtative and quantitative guide to predict the extent of complex formatkn in binary liquid mixtwes of nonelectrolytes ( 7 -4). The binary llquld mixtures (I) acetonitrile + methyl benzoate, (I I) acetonitrile + ethyl benzoate, (I I I) acetonitrile + npropyl benzoate, and (IV) acetonltrk + n-butyl benzoate were chosen The dendties and adlabatk comprerrlMtltle8 have been meawed at 298.15 K for a d u t h s of NaCI, KCI, CsCI, NaBr, KBr, [Ph,P]CI, and )rla[Ph,B] dkolved In
Journal of Chemical & Engineering Data, 2006
Densities and viscosities of the binary mixtures of acetronitrile with tetrahydrofuran, 1,3-dioxolane, and 1,4dioxane were measured over the entire range of composition at (298.15, 308.15, and 318.15) K. Ultrasonic speeds of these binary mixtures have also been measured at 298.15 K. From the experimental data, values of excess molar volumes (V E), viscosity deviations (∆η), and deviations in isentropic compressibility (∆K s) have been calculated. These results were fitted to Redlich-Kister polynomial equation. The density and viscosity data were analyzed by some semiempirical viscosity models, and the results have been discussed in terms of molecular interactions and structural effects. The excess properties were found to be either negative or positive depending on the molecular interactions and the nature of liquid mixtures. To explore the nature of the interactions, various thermodynamic parameters (e.g., intermolecular free length, specific acoustic impedance, etc.) have also been derived from the density and ultrasonic speed data.
The Journal of Chemical Thermodynamics, 2007
Densities and dynamic viscosities for methanol or ethanol with water, ethyl acetate, and methyl acetate at several temperatures T = (293.15, 298.15, and 303.15) K have been measured over the whole composition range and 0.1 MPa, along with the properties of the pure components. Excess molar volumes, viscosity deviations, and excess free energy of activation for the binary systems at the above-mentioned temperatures, were calculated and fitted to the Redlich-Kister equation to determine the fitting parameters and the root-mean-square deviations. UNIQUAC equation was used to correlate the experimental viscosity data. The UNIFAC-VISCO method and ASOG-VISCO method, based on contribution groups, were used to predict the dynamic viscosities of the binary mixtures.
Density, viscosity and thermodynamic activation of viscous flow of water + acetonitrile
Physics and Chemistry of Liquids, 2006
Densities and viscosities for the system, water (W) þ sulfolane (SFL), have been determined for the entire range of composition at temperatures ranging from 303.15 to 323.15 K. Density, excess molar volume, viscosity, excess viscosity and thermodynamic activation parameters for viscous flow have been calculated and plotted against the mole fraction of SFL. The measured properties and some of the derived properties have been fitted to appropriate polynomial equations. These have been explained in terms of such factors, as, dipole-dipole interaction, partial accommodation of water molecules into the structural network of SFL and H-bonding between SFL and H 2 O.
Physics and Chemistry of Liquids, 2015
Calculation of excess properties in N,N-dimethylacetamide + 2-methoxyethanol binary mixtures at (298.15, 308.15 and 318.15) K from experimental density, viscosity and sound velocity values were presented in previous work. Applications of these experimental values to test different correlation equations as well as their corresponding relative functions were also reported. Considering the quasi-equality between the Arrhenius activation energy Ea and the enthalpy of activation of viscous flow H*, here we can define partial molar activation energy Ea1 and Ea2 for N,N-dimethylacetamide and 2-methoxyethanol respectively along with their individual contribution separately. Correlation between Arrhenius parameters reveals interesting Arrhenius temperature with a comparison to the vaporization temperature in the liquid vapor equilibrium, and the limiting corresponding partial molar properties that can permit us to estimate the boiling points of the pure components.
Journal of Applied Science & Process Engineering
Viscosities (h) of three binary non-aqueous systems of ACN + MEA, + MMEA and + MEEA have been measured in the whole range of compositions at temperatures ranging between 303.15 and 323.15 K at an interval of 5 K. At different compositions, deviations in viscosity (Dh), free energy (ΔG‡) of activation for viscous flow along its excess values (ΔG‡E) were calculated from experimental ρ andh data. For all systems, h vs. x2 initially changed very slowly, but with the increment of solute concentration h were found to rise quite rapidly. The values of Dh were largely positive and they formed a sharp maximum invariably at the highly alkanolamine-rich regions. All positive values of Dh followed the increasing order as: ACN + MMEA > ACN + MEA > ACN + MEEA. The order of DG‡E at the maximum point was ACN + MMEA > ACN + MEA > ACN + MEEA. For the correlative model, zero parameter relations: Bingham, Kendall- Munroe, Gambill, and Eyring relations, one parameter relations: Hind, Grunber...
Fluid Phase Equilibria, 2014
Experimental data on densities, viscosities, and refractive indices of binary mixtures with 2-butanol and polyethylene glycols of different molecular weights, tetraethylene glycol dimethyl ether, or N-methyl-2-pyrrolidone, were determined in the temperature interval from 288.15 K to 323.15 K and at atmospheric pressure. Excess molar volumes, viscosity deviations, and deviations in refractive indices were computed from these data and correlated with the Redlich−Kister polynomial equation. The obtained results allowed the interpretation of specific inter-and intramolecular interactions.
Journal of Molecular Liquids, 2000
t-xcess molar volumes, and viscosities at (298 15, 308.15, and 318 15) K and atmospheric pressure for the binary mixtures of tetraethylene glycol dimethyl ether with methyl acetate, ethyl acetate, and propyl acetate have been measured over the whole mole fraction range From these data, deviations in viscosity, and excess free energies of activation of viscous flow have been calculated. These parameters are used to discuss the molecular interactions between the components of the mixtures Furthermore, activation enthalpies, and entropies of viscous flow have been evaluated and their variation with concentration is discussed. A short comparative study with results for mixtures with esters and polyethers is also presented.