S.L. Oswal

Studies of viscosity and excess molar volume of binary mixtures.: 1. Propylamine+1-alkanol mixtures at 303.15 and 313.15 K

Abstract The excess molar volume VE viscosity deviation Δη, excess viscosity Δln η and excess Gibbs energy of activation ΔG*E of viscous flow have been investigated from the density ρ and viscosity η measurements of seven binary mixtures of propylamine with ethanol, propanol, butanol, pentanol, heptanol, octanol and decanol over the entire range of mole fractions at 303.15 and 313.15 K. The results were fitted to variable degree of polynomials. The viscosity data have been correlated with the equations of Kendall and Monroe, Grunberg and Nissan, Hind, McLaughlin and Ubbelohde, Tamura and Kurata, Katti and Chaudhri, McAllister, Heric and Brewer, and of Auslaender. The systems studied, exhibit very strong cross association due to strong H-bonding between –OH and –NH2 groups. As a consequence of this strong intermolecular association, all seven systems have very large negative VE.

Speeds of sound, isentropic compressibilities, and excess molar volumes of cycloalkane, alkanes and aromatic hydrocarbons at 303.15 K. I. Results for cycloalkane + cycloalkanes, and cycloalkane + alkanes

Abstract The speeds of sound u, isentropic compressibilities K s , excess isentropic compressibilities K s E , and excess molar volumes V E for eleven binary mixtures of cyclopentane + cyclohexane, + cyclooctane, cyclohexane + cycloheptane, + cyclooctane, + methylcyclohexane, cyclohexane + n-hexane, + n-heptane, + n-octane, + iso-octane, methylcyclohexane + hexane and + iso-octane have been reported at 303.15 K. The effects of molecular sizes and shapes of the component molecules and of interaction energy in the mixture have been discussed. The Prigogine-Flory-Patterson (PFP) theory has been applied to analyze the present binary mixtures along with the number of other mixtures containing cis- and trans-decalins taken from the literature.

Speed of sound and isentropic compressibility of binary mixtures containing alkyl acetate or ethyl alkanoate, or ethyl bromo-alkanoate with hexane

Abstract Isentropic compressibilities κS, excess isentropic compressibilities κSE have been determined from measurements of speeds of sound u and densities π of eleven binary mixtures of alkyl acetate, or ethyl alkanoate, or ethyl bromoalkanoate with hexane at 303.15 K. Variable degree of polynomials were fitted to results. The values of κSE regulary decrease with number of carbon atoms of the alkanoate going from positivevalues for methyl acetate + hexane to negative values for docecyl acetate + hexane. The values of κSE for all four-ethyl bromoalkanoate mixtures are highly negative and their magnitude depends on the type of bromoester and the position of Br- atom in ethyl bromoalkanoates. The experimental speeds of sound have been analyzed in terms of collision factor theory (CFT), free length theory (FLT) and Prigogine-Flory-Patterson statistical theory (PFPT) of solutions.

Speed of Sound, Isentropic Compressibilities, and Excess Molar Volumes of Binary Mixtures Containing p-Dioxane

The speed of sound u in and densities ρ of eight binary mixtures of p-dioxane (p-C4H8O2) with methylcyclohexane (c-C6H11CH3), 1-chlorohexane (C6H13C1), 1-bromohexane (C6H13Br), p-xylene [C6H4(CH3)2], propylbenzene (C6H5C3H7), methyl acetate CH3COOCH3), butyl acetate (CH3COOC4H9), and amyl acetate (CH3COOC5H11) were measured over the whole composition range at 30°C. Isentropic compressibilities (KS), Raos molar sound functions (R), excess molar volumes (VE), excess isentropic compressibilities (KSE) together with relative change in volume ΔV/φ1φ2 values, have been obtained for all measured mole fractions. The excess partial molar volume (V1-V10) of p-dioxane in different solvents have also been estimated. The experimental results have been analyzed in terms of the Prigogine–Flory–Patterson theory of solutions.

Speed of sound and isentropic compressibilities of nonelectrolyte liquid mixtures. I. Binary mixtures containingp-dioxane

The speed of sound was measured for mixtures of p-dioxane with cyclohexane, n-hexane, benzene, toluene, carbon tetrachloride, chloroform, 1,1,2,2-tetrachloroethane, pentachloroethane and ethyl acetate over the whole mole fraction range at 30°C. These data were combined with densities and molar volumes to obtain isentropic compressibilities and Raos molar sound functions. Excess isentropic compressibilities and excess speeds of sound have also been calculated. The behavior of the present mixtures is discussed in terms of possible molecular interactions and the Prigogine-Flory-Patterson theory of liquid mixtures.

Speeds of sound and isentropic compressibilities of binary mixtures containing trialkylamines with alkanes and mono-alkylamines at 303.15 and 313.15 K

Abstract Isentropic compressibilities κS, and excess isentropic compressibilities κSE have been determined from measurements of speeds of sound u and densities ρ of 14 binary mixtures of triethylamine (TEA) and tri-n-butylamine (TBA) with n-hexane, n-octane, iso-octane, n-propylamine, n-butylamine, n-hexylamine and n-octylamine. The relative magnitude and sign of κSE have been interpreted in terms of molecular interactions and interstitial accommodation. The values of κSE for TEA + alkane are positive while for TBA + alkane are negative. The values of κSE for TEA + primary amine become progressively less positive and eventually to negative with the increase in chain length of alkylamine. In case of TBA + primary amine, the values of κSE increase from n-propylamine to n-butylamine, and then decrease with chain length of primary amine. The experimental speeds of sound u have been analyzed in terms of collision factor theory, free length theory and Prigogine–Flory–Patterson statistical theory of solutions.

Excess molar volumes of binary mixtures of alkyl acetates with hexane, tetrachloromethane, and trichloromethane

Abstract Excess molar volumes VE have been determined from density ρ measurements, using a vibrating-tube digital densimeter DMA 60/602 for binary mixtures of methyl acetate (MA), ethyl acetate (EA), and n-amyl acetate (n-AA) with n-hexane (C6H12), tetrachloromethane (CCl4), trichloromethane (CHCl3) and of iso-amyl acetate (i-AA) with CCl4, and CHCl3. The results we refitted to the polynomial relations to obtain the coefficients and the standard deviations. The results have been analyzed in terms of disruption of dipolar association of alkyl acetates and molecular interactions between alkyl acetate and chloromethane.

Viscosity of binary mixtures of cycloalkane with cycloalkane, alkane and aromatic hydrocarbon at 303.15 K

Abstract The viscosity ν for eighteen binary mixtures cyclopentane + cyclohexane and + cyclooctane; cyclohexane + cycloheptane, + cyclooctane, + methylcyclohexane, + n-hexane, + n-heptane, + n-octane, + i-octane, + benzene, + toluene, + ethylbenzene, + p-xylene, and + propylbenzene; methylcyclohexane + n-hexane, + i-octane, and + benzene; and cyclooctane + benzene have been reported at 303.15 K over the entire range of composition. The viscosity deviations Δν and excess Gibbs energy of activation ΔG ∗E of viscous flow based on Eyrings theory have been calculated. The effects of molecular sizes and shapes of the component molecules and of interaction energy in the mixture have been discussed. The viscosity data have been correlated with the equations of Grunberg and Nissan, Hind, McLaughlin and Ubbelohde, Tamura and Kurata, Katti and Chaudhri, McAllister, Heric and Brewer, and of Auslaender.

Viscosities and Excess Molar Volumes of Binary Mixtures of Alkyl Acetates with Di-, Tri-, and Tetrachloroethane

The excess molar volume VE, viscosity deviation Δη, excess viscosity ηE, and excess Gibbs energy of activation ΔG*E of viscous flow have been investigated from density ρ and viscosity η measurements of nine binary mixtures of methyl acetate, ethyl acetate, and amyl acetate with dichloroethane, trichloroethane, and tetrachloroethane at 303.15 K. The results were fitted to polynomials of variable degree. The viscosity data have been correlated with the equations of Grunberg and Nissan, Hind, McLaughlin, and Ubbelohde, Tamura and Kurata, Katti and Chaudhri, McAllister, Heric, and Auslaender. The results have been analyzed in terms of molecular interactions between alkyl acetates and chloroethanes.

Viscosity of nonelectrolyte liquid mixtures. IV. Binary mixtures containingp-Dioxane

Measurements of the viscosityη and densityp are reported for eight binary mixtures ofp-dioxane with methylcyclohexane, l-chlorohexane, l-bromohexane, p-xylene, propylbenzene, methyl acetate, butyl acetate. anyl acetate at 303.15 K. The viscosity data haw been correlated with the equations of Grunbeng Nissan. of McAllister, and of Auslaendcr. The relation among the excess viscosityΔ Inη, excess Gibbs energy of activationΔG*E of viscous flow. and intermolecular interaction in these mixtures is discussed.