Jasmin Bhalodia

Volumetric, viscometric and ultrasonic studies on binary mixtures of oleic acid with alkyl esters at 303.15, 308.15 and 313.15 K

Density (), viscosity (η) and speed of sound (u) for binary mixtures of oleic acid with methyl acetate, ethyl acetate, n-propyl acetate and n-butyl acetate were measured at 303.15, 308.15 and 313.15 K over the whole composition range at atmospheric pressure. These results were used to calculate excess molar volumes (V E ), deviations in viscosity (Δη), deviations in speed of sound (Δu), the excess Gibbs free energies of activation of viscous flow (G* E ), deviation in adiabatic compressibility (ΔkS), acoustic impedance (Z) and deviation in acoustic impedance(ΔZ). These results were fitted to Redlich-Kister type polynomial equation of the third degree to derive the binary coefficients. The standard error values were estimated between the calculated and experimental data.

Density, excess molar volumes and refractive indices of β-pinene with o, m, p-xylene and toluene at 303.15, 308.15 and 313.15 K

Densities (ρ), excess molar volumes (VE ), refractive indices (nD ) and deviation in refractive (ΔnD ) indices on mixing for β-pinene with o-xylene, m-xylene, p-xylene and toluene have been determined at T = 303.15, 308.15 and 313.15 K. The excess molar volume and deviation in refractive index have been fitted to Redlich–Kister polynomials. In addition, deviations in refractive indices were compared with the predictions of several mixing rules. Results obtained have been discussed in terms of intermolecular interactions.

Volumetric and viscometric study of binary mixtures of 1,8-cineole with o-, m- and p-cresol at 303.15, 308.15 and 313.15K

Abstract The densities and viscosities of binary mixtures of 1,8-cineole + o-, m- and p-cresol have been measured at 303.15, 308.15 and 313.15 K temperatures at atmospheric pressure. Using experimental values of densities, excess molar volume have been calculated. Similarly, from the densities and viscosities values, deviation in viscosity and excess Gibbs energy of activation for viscous flow has been calculated. Various viscosity correlating interaction parameters like Dolezalek–Schulze (), Grunberg–Nissan (), Tamura–Kurata (), Katti–Chaudhri () and McAllister 3-body relation (, ) have been calculated. The Kendall–Munroe relation, Bingham relation and Arrhenius–Eyring relation have also been calculated. The calculated results were fitted using Redlich–Kister polynomial equation. The results show negative value for excess molar volume and positive value for deviation in viscosity and excess Gibbs energy of activation for viscous flow for all three binaries that indicates the presence of strong interactions between binary components.

Kinetic study of specific base catalyzed hydrolysis of ethyl acrylate in water-ethanol binary system

Kinetic study of hydroxide anion catalyzed hydrolysis of ethyl acrylate has been carried in ethanol-water (10–50% v/v) binary systems at the temperature range 30 ± 0.1, 35 ± 0.1, 40 ± 0.1, and 45 ± 0.1°C. Calculated specific rate constant values decreases with increasing proportion of ethanol at all temperatures. The observed retardation of a base catalyzed hydrolysis reaction is explained on the basis of fact that the formation of polarized transition state is disfavored with increase in % of ethanol. The relation between the change in dielectric constant due to variation in binary mixtures and change in specific rate constant are explained on the basis of electrostatic and non electrostatic contributions of solvent mixtures. The variation of ΔG*, ΔH*, ΔS* with solvent composition and the specific effect of water on the reaction rate kinetics are also discussed.

A STUDY OF THERMODYNAMIC AND INTERACTION PARAMETERS OF OLEIC ACID WITH SOME APROTIC SOLVENTS AT TEMPERATURES OF 303.15, 308.15, AND 313.15 K

Density (ρ) and viscosity (η) of binary mixtures of oleic acid with 1,4-dioxane, N,N-dimethylformamide (N,N-DMF) and dimethylsulfoxide (DMSO) were measured over the entire composition range at 303.15, 308.15, and 313.15 K. The excess molar volume (VE), deviation in viscosity (Δη), and excess free energy of activation of viscous flow (G*E) were calculated using corresponding experimental data as a function of composition. Interaction parameters d12, H12, T12, and Wvis/RT were determined from experimental data of viscosity using the well-known two-body models of Dolezalek-Schulze, Grunberg-Nissan, Tamura-Kurata, and Katti-Chaudhari respectively. The parameters M12 and M21 were calculated using the three-body McAllister relation, and it was found that correlating ability significantly improves for these nonideal systems as adjustable parameters increase. The excess and deviation functions VE, Δη, and G*E were found to have positive values, and these values indicate the presence of dispersion forces as forces of molecular interactions in these binary mixtures. The computed results were fitted to the Redlich-Kister polynomial equation. The main thrust of this study is to correlate the excess properties and interaction parameters with the nature of molecular interactions between the mixing components.