正丁醇/正戊醇+JP-10二元体系的体积性质

在常压下测定了298.15 K时正丁醇/正戊醇+挂式四氢双环戊二烯(C₁₀H₁₆, JP-10)二元体系的黏度和密度. 根据Eyring液体黏性流动理论, 关联了二元体系的黏滞性活化参数, 结果表明, 焓驱动起主要作用. 利用密度数据计算了醇+JP-10二元体系的超额摩尔体积、 超额偏摩尔体积、 表观摩尔体积及偏摩尔体积等体积性质, 结果表明此二元体系的超额摩尔体积为正值.     

Volumetric properties and viscosities of the methyl butanoate + n-heptane + cyclo-octane ternary system at 283.15 and 313.15 K and its binary constituents in the temperature range from 283.15 to 313.15 K

The density and kinematic viscosity of the systems methyl butanoate+cyclo-octane and n-heptane+cyclo-octane were determined at four temperatures in the range 283.15–313.15 K over the whole concentration range. The densities and viscosities of the ternary system methyl butanoate+n-heptane+cyclo-octane were determined at 283.15 and 313.15 K. For the binary systems, the dependence of V^E on composition and temperature was obtained in order to calculate other mixture properties, such as the isobaric thermal expansion coefficients, the temperature coefficients of the molar excess volume and the pressure coefficients of the molar excess enthalpy. In the case of the system n-heptane+cyclo-octane the values of these properties and have been compared with those predicted using the group-contribution model by Nitta et al. in combination with a parameters set available in the literature. Experimental binary and ternary viscosities were correlated for comparison, by means of several empirical and semi-empirical models. Kinematic viscosities were also used to test the predictive capability of the group-contribution model UNIFAC-VISCO. In addition, several empirical equations for predicting ternary properties from only binary results have also been applied.     

Excess volumes, densities, speeds of sound and viscosities for the binary systems of diisopropyl ether with hydrocarbons at 303.15 K

Experimental results of excess volumes, speeds of sound and viscosities at 303.15 K are presented for the binary systems of diisopropyl ether with hexane, heptane, octane, isooctane, benzene, cyclohexane, tetralin and decalin over the entire range of composition. Isentropic compressibilities are calculated from speed of sound and density data. Speeds of sound are evaluated on the basis of Jacobson free length theory and Schaaffs collision factor theory. Further, the viscosity data was analysed on the basis of corresponding states approach and Grunberg and Nissan treatment. The experimental results are discussed in terms of molecular interactions between unlike molecules.     

Excess Molar Volumes and Excess Viscosities of the Ternary System Diethylamine(1) + Ethyl Acetate(2) + n-Heptane(3) at 25°C

Densities and viscosities were experimentally determined in the whole range ofcomposition at 25°C for the ternary system diethylamine(1) + ethyl acetate(2)+ n-heptane(3) and for the three corresponding binary systems. Excess molarvolumes and excess viscosities were calculated for the binaries and the ternarysystems. Results were fitted and predicted with expressions from the literatureand are analyzed to gain insight about liquid mixture interactions.     

Viscosities and thermodynamics of viscous flow of some binary mixtures at different temperatures

Viscosities of three non-electrolyte binary mixtures have been determined at different temperatures over the complete concentration range. Excess molar viscosities and excess molar energies of activation for viscous flow for n-butylamine + dichloromethane, n-butylamine + chloroform and n-butylamine + carbon tetrachloride systems at 20°C, 25°C, 30°C and 35°C were calculated. Thermodynamic effect parameters of activation were also calculated. The predictive abilities of some equations for viscosities of mixtures were examined.Presented at the XV Jornadas sobre Investigación en Ciencias de la Ingeneriía Química y Química Aplicada, Neuquén, 1989, R. Argentina.     

Excess Molar Volumes and Excess Viscosities of the Propan-2-ol + Tetrahydrofuran + 1-Chlorobutane Ternary System at 25°C

Excess molar volumes and excess viscosities of the propan-2-ol + tetrahydrofuran+ 1-chlorobutane system have been determined at 25°C from measurements ofdensities and viscosities. Various expressions are proposed in the literature tocalculate these excess properties from binary data. The empirical correlation ofCibulka is shown to be the best in this system for excess volume, viscosity, andenergy of activation for viscous flow. An application to excess molar volumeshas been made by using Flory's theory. For viscosities, we applied the equations ofGrunberg and Nissan, Katti and Chaudhri, Bloomfield and Dewan, and Wu—andfinally the GC-UNIMOD model.     

Thermophysical Properties of the Ternary System 2-Methoxyethanol + Acetonitrile + 1,2-Dichloroethane, and the Binary Systems at 25°C

Excess molar volumes, change of refractive indexes, and deviation of dynamic viscosity of the 2-methoxyethanol + acetonitrile, 2-methoxyethanol + 1,2-dichloroethane, and acetonitrile + 1,2-dichloroethane binary systems and the excess molar volumes of 2-methoxyethanol + acetonitrile + 1,2-dichloroethane ternary system have been determined at 25°C and at atmospheric pressure, by measuring densities, refractive indexes, and viscosities over the entire range of composition. These derived data of binary and ternary mixtures were fitted to Redlich–Kister and Cibulka equations, respectively. An estimation of excess volumes is also evaluated using a modified Heller equation, which depends on the refractive indexes of the mixture. A comparison of the predictions by different methods with the experimental values of the physical properties has been made.     

Viscosities for Binary Mixtures of 1-Decanol, Hexane, and Diethylamine at 10, 25, and 40°C

Experimental viscosities provide information on the structure of liquids and are required in the design of processes, which involve fluid flow, mass transfer, or heat transfer calculations. This work reports experimental viscosity data of the binary mixtures: 1-decanol + hexane, 1-decanol + diethylamine, and hexane + diethylamine at 10, 25, and 40°C and atmospheric pressure for the whole range of compositions. The viscosities of the pure liquids and their mixtures were determined using Cannon Fenske viscometers thermostated at ±0.01°C. The estimated error in the measured viscosities was less than ±0.005 mPa-s. The dynamic viscosity and the excess energy of activation for viscous flow were also calculated. The equation of Redlich–Kister was used for fitting the excess properties of the binary mixtures. The excess viscosity shows positive deviations from ideal behavior for the mixtures 1- decanol + hexane and 1-decanol + diethylamine and a small negative deviation for the binary system hexane + diethylamine. The experimental results have been also used to test some empirical and semiempirical equations adopted previously to correlate viscosity composition data.     

Viscosities of dimethyl carbonate with alcohols at several temperatures: UNIFAC-VISCO interaction parameters (OCOO/alcohol)

Viscosities have been determined for the binary mixtures dimethyl carbonate (DMC) + methanol, + ethanol, + 1-propanol, + 2-propanol, + 1-butanol, + 2-butanol, and + 1-pentanol at 293.15, 298.15, 303.15 and 313.15 K and atmospheric pressure. Viscosity deviations for the binary systems were fitted to the Redlich–Kister equation. From the experimental data (DMC or diethyl carbonate with above mentioned alcohols at the same temperatures) the interaction parameters (CH₃OHOCOO) and (OHOCOO) have been determined for their application in the UNIFAC-VISCO method, based on contribution groups, to predict the dynamic viscosities of the binary mixtures. Root-mean-square deviations are also gathered. The group contribution thermodynamic viscosity model GC-UNIMOD has been used to predict the dynamic viscosity of the binary mixtures at 298.15 K and their deviations have been shown.     

Densities and Kinematic Viscosities of Ten Binary Liquid Regular Solutions at 308.15 and 313.15 K

The densities and kinematic viscosities of 10 binary regular solutions were measured over the entire composition range at 308.15 and 313.15 K. The excess volumes of mixing, absolute viscosities and viscosity deviations were calculated from the experimental data. The viscosity deviations were found to be negative for eight systems. For the two systems, heptane + octane and toluene + ethylbenzene, the viscosity deviations are scattered around zero. The data reported herein were used to examine the predictive capabilities of some viscosity-prediction models; namely, the predictive version of the McAllister model, the GC-UNIMOD model, the generalized corresponding states principle method, and the Allan and Teja correlation. The results of testing these models revealed that the McAllister model predicts the data much better than the other models and has the lowest absolute average deviation of 1.7%.     

Viscosities of binary mixtures containing one polar component

Viscosities of binary mixtures, benzene + benzonitrile, benzene + methylpropylketone and cyclohexane + methylpropylketone were determined at 303·15 K. The experimental results were analysed in the light of Bloomfleld and Dewan’s theory. The analysis showed that the theory correctly predicts the sign of viscosity function in the case of benzene + benzonitrile and cyclohexane + methylpropylketone.     

直链烷烃与JP-10混配二元体系的体积性质

测定了正壬烷、 十一烷、 十二烷、 十三烷和十四烷5种正构烷烃与挂式四氢双环戊二烯(C₁₀H₁₆, JP-10)组成的二元体系在293.15, 298.15, 303.15和313.15 K下的黏度和密度. 利用所得实验数据分别计算了各个二元体系的体积性质, 从分子结构和分子间相互作用角度讨论了二元体系体积性质的变化规律. 根据Eyring液体黏性流动理论, 关联了二元体系的黏滞性活化参数. 结果表明, 焓驱动居于主导地位.     

Viscosity and Thermodynamics of Viscous Flow for the Systems of Isomeric Pentanols with Toluene

Viscosities of the isomers of pentanol (1-pentanol, 2-pentanol and 3-pentanol) and their binary solutions with toluene in the whole range of composition have been measured at different temperatures between 303.15 and 323.15 K. Viscosities of pure components have been plotted against temperature and for binary mixtures, against the mole fraction of pentanols at different temperatures. At lower concentrations of pentanols, viscosities increase slowly, but at an increasing rate on the continued addition of pentanols in toluene. The excess viscosities and excess free energies of activation for viscous flow are in the order, 3-pentanol + > 2-pentanol + > 1-pentanol + toluene. Excess entropies are found to be negative for the systems 2-pentanol + toluene and 3-pentanol + toluene in the whole range of composition, but for 1-pentanol + toluene the values are small and they are either positive or negative at different compositions. The disruption of H-bonds in pentanols either by thermal effect or by the force of dispersion is in the order: 3-pentanol > 2-pentanol > 1-pentanol. This effect is considered to be quite significant in explaining the temperature dependence of viscosity of pure pentanols, negative excess values of viscosity, free energy and entropy for viscous flow as well as their orders for all the systems.     

Measurement and Correlation of Viscosities, Densities, and Water Activities for the System Poly(propylene glycol) + MgSO4 + H2O at 25°C

Viscosities, densities, and water activities for binary and ternary systems of poly(propylene glycol) 425 + H₂O and poly(propylene glycol) 425 + MgSO₄ + H₂O have been measured at 25°C. From density and viscosity measurements, excess volumes and excess viscosities of the binary poly(propylene glycol) 425 + H₂O, over the entire composition range, were obtained and correlated by means of a Redlich–Kister type equation. Viscosity, density. and water activity data for ternary system of poly(propylene glycol) 425 + MgSO₄ + H₂O were correlated by using a semiempirical equation.     

Viscosities of 1-chlorobutane and 1,4-dichlorobutane with isomeric butanols at 25 and 40°C

This paper reports viscosities and excess viscosities for binary systems of 1-chlorobutane and 1,4-dichlorobutane with isomeric butanols at 25 and 40°C. Results show negative deviations from ideal behavior. Viscosities and excess viscosities were correlated by means of the Grunberg-Nissan equation and the Redlich-Kister equation.     

Excess molar volumes and viscosities of the ternary systemn-butylamine + 1,4-dioxane + acetonitrile at 25°C

Densities and viscosities for the n-butylamine + 1,4-dioxane + acetonitrile system were determined at 25°C and molar excess volumes and excess viscosities were calculated. Of the different expressions existing in the literature that predict these excess properties for ternary mixtures from data for the binary mixtures, the empirical correlation of Singh et al. is the best for this system.     

Densities and Viscosities of the Binary Mixtures Decanol + Some n-Alkanes at 298.15 K

Abstract

Densities and viscosities of four binary liquid systems decanol +n-heptane, +n-octane, +n-nonane, +n-decane, have been determined at 298.15 K and atomospheric pressure, over the complete composition ranges. The excess values of molar volume, viscosity and Gibbs free energy for the activation of flow were evaluated. The Grunberg-Nissan parameter was also calculated. The viscosity data were fitted to the equations of McAllister and Auslander.     

An equation-of-state-based viscosity model for non-ideal liquid mixtures

A viscosity model based on the Eyring’s theory and a cubic equation of state (Peng–Robinson–Stryjek–Vera) has been applied to the correlation and prediction of experimental liquid viscosities of binary mixtures containing polar fluids within a wide range of temperature, pressure and composition (encompassing low-pressure and compressed liquid conditions). Highly non-idealities of the binary mixtures considered in this study were conveniently handled via the application of the Wong–Sandler approach for the mixing rules used in the cubic equation of state. The results obtained were highly satisfactory for various non-ideal binary mixtures over the whole composition range at a low pressure. The predictive capabilities of the present approach were also verified in the representation of liquid viscosities at elevated pressures preserving the same model parameters previously obtained at low pressure.     

Densities and Viscosities of the Ternary Mixture (Benzene + 1-Propanol + Ethyl Acetate) at 298.15 K

Abstract

Densities and viscosities of the ternary mixture (benzene + 1-propanol + ethyl acetate) and the corresponding binary mixtures (benzene + 1-propanol, benzene + ethyl acetate and 1-propanol + ethyl acetate) have been measured at the temperature 298.15 K. From these measurements excess volumes, V^E , excess viscosities, η^E, and excess Gibbs energies of activation for viscous flow, G*^E , have been determined. The equation of Redlich-Kister has been used for fitting the excess properties of binary mixtures. The excess properties of the ternary system were fitted to Cibulka's equation.     

Excess molar volumes and excess viscosities for then-hexane+dichloromethane+tetrahydrofuran ternary system at 25°C

Exces molar volumes, and excess viscosities of then-hexane+dichloromethane+tetrahydrofuran system have been determined at 25°C by measuring densities and viscosities. Different expressions exist in the literature to predict these excess properties from binary data. The empirical correlation of Cibulka is shown to be the best in this system.