Density, viscosity and thermodynamic activation of viscous flow of water + acetonitrile (original) (raw)
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Density, viscosity and thermodynamic activation for viscous flow of water+sulfolane
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.
Journal of Chemical & Engineering Data, 2009
The density and viscosity of dimethylsulfoxide (DMSO) + acetonitrile (AN) mixtures were determined over the whole composition range at T) (298.15, 303.15, 308.15, 313.15, and 318.15) K. Since experimental density values showed to be very sensitive to water content, the water-free values of these magnitudes were determined by extrapolation from data obtained on ternary mixtures with small, well-determined, amounts of water and constant x DMSO /x AN. Excess volumes of the anhydrous mixtures show positive values with a quite symmetrical behavior. Viscosity data were satisfactorily fitted with a sixth degree polynomial. Excess viscosities as well as activation parameters for viscous flow in the mixtures were calculated.
Excess parameters for the binary mixtures of sulfolane with chloroethanes at different temperatures
Densities (q), viscosities (g) and ultrasonic velocities (u) have been measured for the binary mixtures of sulfolane with 1,2-dichloroethane, 1,1,2-trichloroethane and 1,1,2,2-tetrachloroethane over the entire range of mole fraction at T = (303.15, 308.15 and 313.15) K. These data have been used to compute the excess molar volume (VE), deviation in viscosity (Dg), deviation in isentropic compressibility (Djs), excess Gibbs free energy of activation of viscous flow (G*E) and Grunberg–Nissan interaction parameter (d0). The excess parameters have been fitted to Redlich–Kister-type polynomial equation using multiparametric nonlinear regression analysis to estimate the binary coefficients and standard deviation. The experimental results have been discussed in terms of dipole–dipole interactions and formation of molecular complexes between unlike molecules of the investigated mixtures. Furthermore, the effect of temperature and chlorine atoms of chloroethane is also studied for the present binary mixtures
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.
Thermophysical properties of solvent are set of data that are essential for designing processes in industry. But in the absence of experimental data, an accurate predictive method is required. In this context, density () and viscosity () of sulfolane with glycerol and 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide have been measured over the entire range of composition with temperature ranging from 298.15 K to 363.15 K at atmospheric pressure. From these experimental values, thermal expansion (), excess molar volume (V E), viscosity deviation () and Gibbs free energy (G) were calculated. The predicted values were close to the corresponding experimental data with all the standard deviation lower than 1 × 10 −3. Quantum chemical based COSMO-RS was used to predict the molecular interaction and non-ideal liquid phase activity coefficient for all mixtures. It has been interpreted that strong interaction for the sulfolane + [BMIM][NTf 2 ] system, meanwhile weak interaction was deduced for the sulfolane + glycerol system. The molar enthalpy (H), entropy (S) and Gibbs free energy of activation (G) of viscosity were calculated. Simultaneous effects of composition and temperature for the binary mixtures were also reported.
Excess parameters of binary mixtures of acetonitrile- dimethyl sulphoxide
Scientia Africana
The excess parameters associated with liquid mixes of acetonitrile-dimethyl sulphoxide were analyzed to estimate the degree of intermolecular interactions in the binary system. The viscosities and densities of the binary system were determined at temperatures of 298.15, 303.15, 318.15, 328.15, and 338.15K, respectively, with a percentage composition of 0 to 100 percent. Using the experimental density and viscosity measurements, the excess molar volumes (VmE), excess viscosity (nE), excess Gibbs' free energy of activation of viscous flow (G*E), and Grunberg-Nissan interaction parameters were calculated. Deviations from these parameters studied in the composition of the mixtures and temperature were discussed in terms of molecular interactions in these mixtures. A comparison of several interaction characteristics was expressed to better understand the intermolecular interactions between acetonitrile and dimethyl sulphoxide. As the temperature of the system and the mole fractions o...
Physics and Chemistry of Liquids, 2005
Densities and viscosities for the system, water (W) þ ethylenecarbonate (EC), have been determined for the entire range of composition at temperatures ranging from 313.15 to 333.15 K. Density, excess molar volume, viscosity, excess viscosity and thermodynamic activation parameters for viscous flow have been calculated and plotted against mole fraction of EC. The measured properties and some of the derived properties have been fitted to appropriate polynomial equations. These have been explained in terms of factors, such as dipole-dipole interaction, partial accommodation of water molecules into the structural network of EC and H-bonding between EC and H 2 O.