Viscosities of binary liquid mixtures of polar and non-polar solvents at 303.15 k

This paper explains the various characteristics of liquid and liquid mixtures. In this paper viscosities for the binary liquid mixtures of methyl ethyl ketone with benzene, nitrobenzene, cblorobenzene and bromobenzene were determined at 303.15 K. The deviation in viscosity was calculated and its behaviours was studied as a function of mole fraction. The deviation in viscosity is negative in the system methyl ethyl ketone with benzene and is positive in the other systems. The results were discussed in terms of interactions.

Excess Thermodynamic Properties and Molecular Interactions in Binary Liquid Mixture of o-xylene and N-nonane

Experimentally measured data for viscosity and refractive index of (o-Xylene + n-Nonane) binary mixture are reported in this research paper for various compositions for three different temperatures at atmospheric pressure. Modified Ubbelholde viscometer and Abbe-3L Refractometer were used for experimental measurements. Deviation in molar refraction (ΔR) and deviation in viscosity (Δη) w.r.t composition have been calculated from the experimental data. ‘Grunberg and Nissan’ equation and Herric’s Correlation were used to correlate the viscosity data. Excess thermodynamic properties were fitted to Redlich-Kister equation. Coefficients and standard deviations, hence obtained are reported. Variation in Excess Thermodynamic properties for the mixture have been discussed in terms of intermolecular interactions

Propriedades volumétricas, viscosimétricas, acústicas e espectroscópicas de soluções líquidas binárias contendo gama-valerolactona (GVL) e álcoois

Substances derived from biomass have called attention, once these compounds belong to the group of renewable solvents, whose physicochemical properties present great potential for applications in several areas of science and industry, namely in biorefineries. Therefore, thermodynamic properties of systems containing such liquids is of practical interest, because experimental data can be used in modeling in order to improve processes or yet to develop and verify new models and solution theories, which have shown their complexity. The present project aims at studying excess thermodynamic properties, that quantify the real solution deviation in comparison to the ideal one, and spectroscopic analyses of binary liquid systems constituted of gamma-valerolactone (GVL) + alcohols (ethanol, 1-propanol, 1-butanol or 1- pentanol). For this purpose, original values of density, speed of sound and dynamic viscosity were determined for these solutions in the whole composition range and in temperatures T = (293.15 – 313.15) K under ambient pressure (92.3 kPa). From these experimental results, it was possible to calculate volumetric properties such as excess molar volume (Vm E ), acoustic property as deviation in isentropic compressibility (??S), viscometric as deviation in viscosity (??) and excess Gibbs energy of activation of viscous flow (?G *E). These properties resulted in negative values at all conditions, except for Vm E , which was totally negative only in ethanol-GVL system. To complete the thermodynamic discussion, both nuclear magnetic resonance (1H-NMR and 13C-NMR) and infrared (ATR-FTIR) spectroscopies have been performed, whose spectra proved the existence of weak hydrogen bondings between GVLalcohol

Excess Molar Volume Calculation and Viscosity Deviation and Excess Gibbs Energy for Binary Solution of 1- Propanol with Butyl Acetate at Temperatures (40,50,60) 0C

In this research, the solubility Process of the binary liquid solution(1-Propanol and butyl acetate) were studied at temperature(40,50.60)0C. Densities ρ by pycnometer method and viscosity ƞ by OSTWALD tube that calibrated with distilled water was measured. Then excess molar volume was calculated of pure component and its mixtures that was prepared over the entire mole fraction range. It has been observed that excess molar volumes values were negative at all temperatures. After that, the deviation in viscosity ∆ ƞ and Excess Gibbs free energy ∆GE was determined and it has been observed that it takes negative values at all temperatures. Excess molar volume, deviation in viscosity, excess Gibbs free energy were correlated with Redlich-Kister equation Type polynomial and the showed an accepted standard deviation between the experimental and calculated values it has been shown the effect of Hydrogen bonds formation and the spherical shape for the molecules and its size on the excess thermodynamic properties.

Volumetric, viscometric and optical study of molecular interactions in binary mixtures of diethyl malonate with ketones at 303.15, 308.15 and 313.15K

Density ?, viscosity ?, and refractive index nD were measured for the binary mixtures of diethyl malonate with ketones (acetophenone, cyclopentanone, cyclohexanone and 3-pentanone) at temperatures (303.15, 308.15 and 313.15) K over the entire composition range. Excess volume VE, deviation in viscosity ??, excess Gibb?s free energy of activation for viscous flow ?GE and deviation in molar refraction ?R were determined from the experimental data and computed results were fitted to the Redlich-Kister polynomial equation. The values of VE, ??, ?GE, and ?R were plotted against the mole fraction of diethyl malonate. The observed positive and negative values of excess parameters for all the studied binary mixtures were explained on the basis of intermolecular interactions present in these mixtures. Further different empirical relations were used to correlate the binary mixture viscosities and refractive indices.