Density, viscosity and thermodynamic activation for viscous flow of water+sulfolane (original) (raw)
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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.
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
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.
Evaluation of viscosity in binary mixtures of dimethyl sulphoxide at 298.15K
Journal of Analytical & Pharmaceutical Research, 2021
The viscosity of binary mixtures of dimethyl sulphoxide with different alcohols such as methanol, ethanol, 1-propanol, iso-propanol, 1-butanol, iso-butanol, tertiary butanol has been determined at 298.15K. The experimental values are compared with theoretical values evaluated by different theories. It is observed that for some theories, values are in agreement with the experimental values. Further, an attempt has been made to study the intermolecular interactions in studied solutions in terms of excess free energy of mixing, strength of interaction parameters and interaction energy. The viscosity data of pure liquids and their mixtures are needed to design various chemical processes where heat and mass transfer are important.
Applied Sciences
Densities and viscosities of the binary systems dimethylsulfoxide with diethylene glycol and methyldiethanolamine were measured at temperatures ranging from 293.15 to 313.15 K, at atmospheric pressure and over the entire composition range. The experimental density data was correlated as a function of composition using Belda’s and Herraez’s equations, and as a function of temperature and composition using the models of Emmerling et al. and Gonzalez-Olmos-Iglesias. The viscosity results were fitted to the Grunberg-Nissan, Heric-Brewer, Wilson, Noda, and Ishida and Eyring-NRTL equations. The values of viscosity deviation (Δη), excess molar volume (VE), partial molar volumes (V1¯ and V2¯) and apparent molar volume (Vφ,1 and Vφ,2) were determined. The excess functions of the binary systems were fitted to the polynomial equations. The values of thermodynamic functions of activation of viscous flow were calculated and discussed.
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.