2-甲基-3-丁烯-2-醇+直链一元醇二元体系的过量摩尔体积和表观摩尔体积298.15 K)

Excess molar volumes (Vm^E) of binary mixtures of 2-methyl-3-buten-2-ol[CH3C(OH)(CH3)CHCH2] with four 1-alcohols:methanol,ethanol,1-propanol and 1-butanol at 298.15K and atmospheric pressure are derived from density measurements with a vibrating-tube densimeter.All the excess volumes are negative in the systems over the entire composition range. The results are correlated with the Redlich-Kister equation.The effects of chain length of 1-alcohols on Vm^E are discussed.The apparent molar volumes of 2-methyl-3-buten-2-ol and 1-alcohols are calculated respectively.     

二元混合物环丁酚和对二甲苯、乙苯在温度范围为303.15—353.15K下的密度、黏度及其相关性质

Densities and viscosities of the binary systems of sulfolane ＋ ethylbenzene, sulfolane ＋ p-xylene have been experimentally determined in temperature interval 303.15—353.15 K and at atmospheric pressure for the whole composition range. The excess molar volumes and viscosity deviations were computed. The computed quantities have been fitted to Redlich-Kister equation. Excess molar volumes and viscosity deviation show a systematic change with increasing temperature. Two mixtures exhibit negative excess volumes with a minimum which occurs approximately at χ = 0.5. The effect of the size, shape and interaction of components on excess molar volumes and viscosity deviations is discussed.     

二元混合物环丁酚和对二甲苯、乙苯在温度范围为303.15-353.15K下的密度、黏度及其相关性质

Densities and viscosities of the binary systems of sulfolane ethylbenzene, sulfolane p-xylene have been experimentally determined in temperature interval 303.15-353.15 K and at atmospheric pressure for the whole composition range. The excess molar volumes and viscosity deviations were computed. The computed quantities have been fitted to Redlich-Kister equation. Excess molar volumes and viscosity deviation show a systematic change with increasing temperature. Two mixtures exhibit negative excess volumes with a minimum which occurs approximately at x = 0.5. The effect of the size, shape and interaction of components on excess molar volumes and viscosity deviations is discussed.     

Density, ultrasonic velocity, viscosity and their excess parameters of the binary mixtures of N,N-dimethylaniline+1-alkanols (C3-C5), +2-alkanols (C3-C4), +2-methyl-1-propanol, +2-methyl-2-propanol at 303.15K

The density, ultrasonic velocity of sound and viscosity of binary mixtures of N,N-dimethyl aniline (N,NDMA) with 1-propanol, +2-propanol, +1-butanol, +2-butanol, +1-pentanol, +2-methyl-1-propanol, +2-methyl-2-propanol were measured at 303.15 K. These experimental data have been used to calculate excess volume V ^E , excess ultrasonic speeds u ^E , excess intermolecular free length L _f ^E , excess acoustic impedance Z ^E , excess isentropic compressibility κ _s ^E , deviation in viscosity Δη and excess Gibbs free energy of activation of viscous flow (G* ^E ). The values of L _f ^E and κ _s ^E are negative over the wide range of composition for all the binary mixtures, while the values of Z ^E are positive. These results have been used to discuss the nature of interaction between unlike molecules in terms of hydrogen bonding, dipole-dipole interaction, proton-acceptor interaction and dispersive forces. The viscosity data have been correlated using three equations: Grunberg and Nissan, Katti & Chaudhri and Hind et al. The excess/deviations were fitted by a Redlich-Kister equation and the results were analyzed in terms of specific interactions present in these mixtures.     

Viscometric and FTIR studies of molecular interactions in 2-propanol+hydrocarbons mixtures at 298.15 and 308.15 K

The deviation in viscosity was coupled with respective excess molar volume data to study the molecular interaction in binary mixtures with one associated component. This approach was applied to the experimentally measured viscosity and excess molar volume data of the 2-propanol+hydrocarbons at 298.15 K and 308.15 K. It was suggested that depolymerization power of aromatic hydrocarbon toward 2-propanol as well as strength of intermolecular interactions (electron-donor-acceptor type) between monomer of 2-propanol and aromatics depend on π-electron density of the aromatic hydrocarbon. These interactions were further confirmed by FTIR spectroscopy. The viscosity of these binary mixtures was best predicted by Gruenberg-Nissan correlation among the four correlations applied.     

Thermodynamics of molecular interactions in binary mixtures containing associated liquids

Experimentally measured data of excess molar volumes and enthalpies at 308.15 K for binary mixtures of formamide with 1-butanol or 2-methyl-1-propanol were fitted to the Redlich-Kister polynomial equation. Thermodynamics of molecular interaction in these mixtures was discussed using Prigogine-Flory-Patterson theory, Treszczanowicz-Benson association model and Graph theoretical approach. Extent of inter-molecular H-bonding in formamide and butanol in their binary mixtures was also reflected in their molar enthalpy of association of H-bonding Δh _H ⁰ and association constant K _H calculated from Treszczanowicz-Benson association model. All the three theories predict the excess property data reasonably well.     

Excess molar volumes for titanium butoxide contained binary and ternary systems at 298.15 K

The reported mixture properties of metal alkoxide are almost none in spite of their increasing usages. In this work, the excess molar volumes (V^E) were determined from measured densities for six binary systems of titanium butoxide (1) + ethanol (2), titanium butoxide (1) + 1-propanol (2), titanium butoxide (1) + 1-butanol (2), ethanol (1) + 1-propanol (2), 1-propanol (1) + 1-butanol (2) and ethanol (1) + 1-butanol (2) at 298.15 K. The experimental V^E were correlated with the Redlich–Kister polynomial. The partial excess molar volumes at infinite dilution were calculated with fitted binary parameters. Additionally the ternary V^E data at 298.15 K were also predicted for three systems of titanium butoxide (1) + ethanol (2) + 1-propanol (3), titanium butoxide (1) + ethanol (2) + 1-butanol (3) and titanium butoxide (1) + 1-propanol (2) + 1-butanol (3) by using the binary contribution model of Radojkovič with the binary Redlich–Kister parameters.     

Excess molar volumes at the 308.15 K for constituent binaries of n-decane,n-dodecane, 1-decanol and 1-dodecanol

Excess molar volumes (V_m ^E) of constituent binary mixtures of n-decane, n-dodecane, 1-decanol and 1-dodecanol which are the products of liquid phase oxidation of n-paraffins, have been measured experimentally as a function of composition x from density measurements at 308.15 K. The excess molar volumes of n-decane-n-dodecane system have negative deviation from the ideality while that of n-dodecane-1-decanol system have positive deviation. In the other systems, excess molar volume exhibits inversion in sign. Experimental data were successfully correlated with Redlich-Kister polynomial.     

水杨酸苯酯与C4醇固液平衡测定与关联

In an equilibrium vessel,the solid-liquid equilibria(SLE) for three binary mixtures of phenyl salicylate with 1-butanol,2-butanol,and 2-methyl-1-propanol,respectively,have been measured from 283.15 K to the melting temperature of the solute using a method in which an excess amount of solute was equilibrated with the alcohol solution.The liquid concentrations of the investigated phenyl salicylate in the saturated solution were analyzed by UV spectrometry.Activity coefficients for phenyl salicylate have been calculated by means of the Wilson,NRTL,and UNIQUAC equations and with them were correlated solubility data that were compared with the experimental ones.The best correlation of the solubility data has been obtained by the Wilson equation by which the average root-mean-square deviation of temperature for the three systems is 1.03 K.     

Effect of Temperature on the Physico-Chemical Properties of a Room Temperature Ionic Liquid (1-Methyl-3-pentylimidazolium Hexafluorophosphate) with Polyethylene Glycol Oligomer

A systematic study of the effect of composition on the thermo-physical properties of the binary mixtures of 1-methyl-3-pentyl imidazolium hexafluorophosphate [MPI][PF(6)] with poly(ethylene glycol) (PEG) [M(w) = 400] is presented. The excess molar volume, refractive index deviation, viscosity deviation, and surface tension deviation values were calculated from these experimental density, ρ, refractive index, n, viscosity, η, and surface tension, γ, over the whole concentration range, respectively. The excess molar volumes are negative and continue to become increasingly negative with increasing temperature; whereas the viscosity and surface tension deviation are negative and become less negative with increasing temperature. The surface thermodynamic functions, such as surface entropy, enthalpy, as well as standard molar entropy, Parachor, and molar enthalpy of vaporization for pure ionic liquid, have been derived from the temperature dependence of the surface tension values.     

离子液体[C4mim][PF6]与N, N-二甲基甲酰胺二元混合物在298.15 K～318.15 K的密度和粘度

Viscosities and densities for 1-butyl-3-methylimidazolium hexafluorophosphate （[C4mim][PF6]） and N, N-dimethylformamide （DMF） binary mixtures have been measured at the temperature range from 293.15 K to 318.15 K. It is shown that the viscosities and densities decrease monotonously with temperature and the content of DMF. Various correlation methods including Arrhenius-like equation, Sedclon et al.＇s equation, Redlich-Kister equation with four parameters, and other empirical equations were applied to evaluate these experimental data. A model based on an equation of state Ior estimating the viscosity of mixtures containing ionic liquids were proposed by coupling with the excess Gibbs free energy model of viscosity, which can synchronously calculate the viscosity and the molar volume. The results show that the model gives a deviation of 8.29% for the viscosity, and a deviation of 1.05% for the molar volume when only one temperature-independent adjustable parameter is adopted. The correlation accuracy is further improved when two parameters or one temperature-dependent parameter is used.     

EXCESS PROPERTIES OF (2-PROPANOL + ETHYLACETATE OR BENZENE) BINARY LIQUID MIXTURE

The density, viscosity and surface tension of binary liquid mixtures of (x 2-propanol + (1 -; x) ethylacetate) and (x 2-propanol + (1 -; x) benzene) have been studied at 20, 25 and 30°C. From the experimental results, excess volume, excess viscosity, excess surface tension and excess Gibbs free energy for the activation of flow have been computed. The Grunberg and Nissan parameter, d have also been calculated. The results obtained are ascribed to the intermolecular interactions present in the mixtures     

Excess molar enthalpies of ternary and constituent binary systems {1,2-dichloropropane+2-propanol+2-butanol} at T=298.15 K

Ternary excess molar enthalpies at T=298.15 K and P=101.3 kPa for the system of {1,2-dichloropropane+2-propanol+2-butanol} and their constituent binary systems {1,2-DCP+2-propanol}, {1,2-DCP+2-butanol}, and {2-propanol+2-butanol} have been measured over the whole composition range using an isothermal micro-calorimeter with flow-mixing cell. All of the binary and ternary systems, including three pseudobinary systems, show endothermic behavior except for the binary mixture {2-propanol+2-butanol}, which shows small exothermicity. The Redlich-Kister equation was used to correlate the binary H _{m, ij} ^E data, and the Morris equation to correlate the ternary H _{m, 123} ^E data. Comparisons between the Morris and Radojkovi equations for the prediction of H _m,123 ^E have been also made. The experimental results have been qualitatively discussed in terms of self-association, isomeric effect and chain length among molecules.     

Measurement,correlation and prediction of binary vapor-liquid equilibria for alcohol-tetrachloroethene systems

Experimental isobaric vapor-liquid equilibria of binary mixtures of tetrachloroethene with ethanol, 2-propanol, 2-butanol and 2-pentanol have been measured at 101.08 kPa. The UNIFAC (Fredenslund et al., 1975), a group contribution model and the activity coefficient models of Margules and Van Laar (as presented by Carlson and Colburn, 1942), Wilson (1964), NRTL (Renon and Prausnitz, 1968) and UNIQUAC (Abrams and Prausnitz, 1975) have been used to predict the vapor composition from measured T-x data of ten binary mixtures of alcohol-tetrachloroethene including these four systems. The average absolute deviation between the experimental and the predicted vapor composition with the UNIFAC model ranges from 0.006 to 0.023 mole fraction and that with the activity coefficient models ranges from 0.003 to 0.038. The maximum deviation in both the cases occurred in the data of 1-propanol (Venkateswara Rao et al., 1980).     

正癸烷+正戊醇,+1-己醇,+庚醇二元混合物在293.15到363.15K和大气压力下的密度和粘度（英文）

Densities (ρ) and dynamic viscosities (η) for three binary mixtures of n-decane with 1-pentanol, 1-hexanol and 1-heptanol are presented at temperatures from 293.15 to 363.15 K and atmospheric pressure over the entire composition range. The density and viscosity are measured using a vibrating tube densimeter and a cylindrical Couette type rotating viscometer, respectively. Excess molar volumes (VE), viscosity deviations (Δη) and excess Gibbs energy of activation of viscous flow (ΔG*E) are calculated from the experimental measurements. Intermo-lecular and structural interactions are indicated by the sign and magnitude of these properties. Partial molar vol-umes and infinity dilution molar partial volumes are also calculated for each binary system. These results are correlated using Redlich–Kister type equations.     

Excess Molar Volumes and Viscosities of Binary Mixtures of p-Xylene with Cyclohexane, n-Heptane, n-Octane, Sulfolane, N-Methyl-2-pyrrolidone and Acetic Acid at 303.15 K and 323.15 K and Atmospheric Pressure

Experimental data on density and viscosity at 303.15 K and 323.15 K are presented for the binary mixtures of p-xylene with cyclohexane, n-heptane, n-octane, sulfolane, N-methyl-S-pyrrolidone and acetic acid. From these data, the excess molar volume and deviations in viscosity have been calculated. The computed quantities have been fitted to the Redlich-Kister Equation to derive coefficients and estimate the standard error values. Results are discussed in terms of intermolecular interactions.     

Viscosities of binary liquid mixtures of cyclohexanone with alkanes,benzene, toluene and tetrachloromethane at 298.15 K

Viscosities for the binary liquid mixtures of cyclohexanone with n-hexane, n-heptane, 2, 2, 4-trimethylpentane, benzene, toluene and tetrachloromethane have been determined at 298.15 K. The deviation in viscosity from the ideal law is negative in all the systems except in the system, cyclohexanone with tetrachloromethane. In this system excess viscosity exhibits a positive deviation over the entire range of mole fraction. The results have been interpreted in terms of molecular interactions, and of difference in size and shape of components. The theoretical excess viscosities have been calculated from absolute reaction rate theory and free volume theory of flow by making use of the Bloomfield and Dewan relations. Theoretical excess viscosities are in qualitative agreement with experimental results for four out of the six systems examined.     

3-庚3-庚酮+乙酸乙酯、3-庚酮+乙酸丁酯、3-庚酮+TBP、MIBK+TBP二元体系的过量摩尔体积和黏度

常压下测定了3-庚酮+乙酸乙酯、3-庚酮+乙酸丁酯、3-庚酮+磷酸三丁酯（TBP）、4-甲基-2-戊酮（MIBK）+磷酸三丁酯4个二元体系在293.15～318.15 K下的密度和黏度值,计算了二元体系的过量摩尔体积V^E和过量黏度Δη,并用Redlich-Kister方程对V^E和Δη进行了关联。混合溶剂的黏度数据采用Orrick-Erbar(O-E)基团贡献法进行了关联和预测,增加了O-E方法中的(-O)₃-P=O 基团贡献值。结果表明,O-E方法可根据现有的纯溶剂的黏度数据预测得到混合溶剂的黏度,平均误差小于15%。     

Speed of sound and isentropic compressibility of organic solvents + sunflower oil mixtures at 298.15 K

The speed of sound in binary liquid mixtures of organic solvents with sunflower oil was measured over the entire range of concentrations at 298.15 K. The solvents considered were: n-hexane, n-heptane, n-octane, n-nonane, ethanol, 1-propanol, 2-propanol, 1-butanol, ethyl acetate, propyl acetate, isopropyl acetate, butyl acetate, and vinyl acetate. The speed of sound data were used to calculate isentropic compressibilities and excess isentropic compressibilities. The excess isentropic compressibilities vs. concentrations were correlated using Redlich-Kister polynomials. Speed of sound determinations in the mixtures were predicted using two mixing rules proposed in the literature, and values were compared with experimental data. In all cases, SD between predicted and experimental data were less than 3.5%.     

Excess properties and spectroscopic studies for binary system polyethylene glycol 600 + dimethyl sulfoxide at T =(298.15, 303.15,308.15, 313.15, and 318.15) K

The work presents density (ρ) and viscosity (η) data of binary system polyethylene glycol 600 (PEG) + dimethyl sulfoxide (DMSO) over the entire concentration range at T =(298.15,303.15,308.15,313.15 and 318.15) K and atmospheric pressure.On the basis of density and viscosity values,the excess properties of PEG (1) + DMSO (2) mixtures,including excess molar volume (VEm),viscosity deviation (△η),excess free energies of activation (△G*E),and isobaric thermal expansion coefficient (αp),were calculated.At the same time,in order to conjecture the density viscosity under different conditions,the density and viscosity data were fitted with the corresponding formula.The calculated results of VEm,△η,and △G*E were fitted with the Redlich-Kister equation to derive coefficients and estimate the standard deviations (σ) between the experimental and calculated values.Moreover,the intermolecular interaction of PEG with DMSO was discussed on the basis of FTIR and UV-Vis spectral results of PEG (1) + DMSO (2) mixtures.The results indicated that there were the hydrogen bonding and interactions of hvdroxvl hydrogen atoms in PEG with oxygen atoms in DMSO.