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1.
Hossein Iloukhani Masoomeh Giahshenas Kh. Khanlarzadeh 《Journal of solution chemistry》2013,42(10):1949-1959
Densities (ρ) and viscosities (η) of ternary mixtures of 2-methylbutan-2-ol (1) + trichloroethylene (2) + acetonitrile (3) and the related binary mixtures of {2-methylbutan-2-ol (1) + trichloroethylene (2)}, {2-methylbutan-2-ol (1) + acetonitrile (3)}, and {trichloroethylene (2) + acetonitrile (3)} have been measured over the whole composition range at 298.15 K and at ambient pressure (81.5 kPa). Excess molar volumes $ V_{\text{m}}^{\text{E}} $ , viscosity deviations Δη, and excess Gibbs energies of activation ΔG *E were derived from the experimental data. The binary and ternary data of $ V_{\text{m}}^{\text{E}} $ , Δη, and ΔG *E for the binary and ternary mixtures were correlated as functions of the mole fraction by using the Redlich–Kister and the Cibulka equations. Kinematic viscosities of the binary mixtures were correlated by means of several semi-empirical equations to determine the fitting parameters and the SDs. The experimental results are analyzed to discuss the nature and strength of intermolecular interactions in these mixtures. 相似文献
2.
Mónica B. Gramajo de Doz Carlos M. Bonatti María C. Lucena Diego A. González 《Journal of solution chemistry》2013,42(1):44-51
Liquid–liquid equilibria of the methanol + ethylbenzene + methylcyclohexane ternary system are reported at 278.15, 283.15, and 293.15 K. The effect of the temperature on the liquid–liquid equilibrium is discussed. All chemical concentrations were quantified by gas chromatography using a thermal conductivity detector. Experimental data for the ternary system are compared with values calculated by the NRTL and UNIQUAC equations. It was found that both equations gave comparable quality representations of the experimental data for this ternary system. Distribution curves were also analyzed. Data for the ternary system is available from the literature at 303.15 K. 相似文献
3.
Mohamed E. EL-Hefnawy 《Journal of solution chemistry》2013,42(12):2399-2408
Densities and refractive indices of mixing of olive oil with the alkanols: methanol, ethanol, 1-propanol, 2-propanol and 1-butanol, have been measured as a function of the composition at T = 298.15 K. Excess molar volumes, $ V_{\text{m}}^{\text{E}} $ , and deviation in refractive index, Δn D, were calculated and correlated by a Redlich–Kister type function, to derive the coefficients and estimate the standard error. For mixtures of olive oil with alkanols, $ V_{\text{m}}^{\text{E}} $ is positive, except with ethanol and methanol where a sigmoidal variation is observed. Δn D is positive over the entire range of mole fraction. The effect of chain length of the alkanols on the excess molar volumes and deviation in refractive index of the mixtures with olive oil are discussed. 相似文献
4.
Mónica B. Gramajo Jonatan H. Veliz María C. Lucena Diego A. González 《Journal of solution chemistry》2013,42(10):2025-2033
Liquid–liquid equilibria of the methanol + toluene + methylcyclohexane ternary system at 278.15, 283.15, 288.15, 293.15, 298.15 and 303.15 K are reported. The effect of the temperature on liquid–liquid equilibrium is discussed. Data for the ternary system is available from the literature at T = 298 K. All chemicals were quantified by gas chromatography using a thermal conductivity detector. Experimental data for the ternary system are compared with values calculated by the NRTL and UNIQUAC equations. It is found that the UNIQUAC and NRTL models provide similar good correlations of the solubility curve at these six temperatures. 相似文献
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Yang-Xin Yu Tie-Zhu Bao Guang-Hua Gao Yi-Gui Li 《Journal of Radioanalytical and Nuclear Chemistry》1999,241(2):373-377
In order to obtain the exact information of atomic number density in the ternary system of HNO3−UO2(NO3)2−H2O, the densities were measured with an Anton-Paar DMA60/602 digital density meter thermostated at 298.15±0.01 K. The apparent
molal volumes for the systems were calculated from the experimental data. The present measured apparent molar volumes have
been fitted to the Pitzer ion-interaction model, which provides an adequate representation of the experimental data for mixed
aqueous electrolyte solutions up to 6.2 mol/kg ionic strength. This fit yields θ
V
, and ψ
V
, which are the first derivatives with respect to pressure of the mixing interaction parameters for the excess free energy.
With the mixing parameters θ
V
, and ψ
V
, the densities and apparent molar volumes of the ternary system studied in this work can be calculated with good accuracy,
as shown by the standard deviations. 相似文献
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Xian-Ming Zhang Yu-Feng Hu Xiao-Ming Peng Wen-Jia Yue 《Journal of solution chemistry》2009,38(10):1295-1306
Conductivities were measured for the ternary systems NaNO3–KNO3–H2O, NaCl–BaCl2–H2O, NaCl–LaCl3–H2O, and their binary subsystems NaNO3–H2O, KNO3–H2O, NaCl–H2O, BaCl2–H2O, and LaCl3–H2O at (293.15, 298.15 and 303.15) K. The results were used to verify the generalized Young’s rule and the semi-ideal solution
theory. Comparison of the results shows that the average relative differences between the predicted and measured conductivities
are ≤4.2×10−3 for NaNO3–KNO3–H2O, ≤4.6×10−3 for NaCl–BaCl2–H2O, and ≤8.9×10−3 for NaCl–LaCl3–H2O, indicating that the generalized Young’s rule and the semi-ideal solution theory can provide good predictions for the conductivity
of mixed electrolyte solutions in terms of the data from their binary subsystems. 相似文献
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Excess molar volumes V E for 40 mixtures of heptane with a liquid alkane and apparent molar volumes in heptane for eight solid alkanes have been obtained at 298.15 K. They include five linear, 30 branched-chain, and 13 cyclic alkanes. Almost all systems exhibit negative V E values. For mixtures with open chain alkanes, V E increases from C5 to C7 and then decreases. A similar trend is shown by mixtures with cycloalkanes. V E values are compared with known H E data for mixtures with heptane and tetrachloromethane. Signs and trends of V E and H E are correlated with the free volume and interactional terms of the Flory theory. The partial molar volumes at infinite dilution in heptane, V°, have also been obtained and discussed together with literature data on other hydrocarbons and polar compounds. The calculated contributions to V° by CH3, CH2, CH and C groups are compared with previously determined contributions of polar groups. The lower contributions of the latter groups are explained with the volume contraction caused by dipole-induced dipole interaction. The volume effects associated with branching and cyclization have been evaluated and compared with the corresponding effects on solvation enthalpy. The branching effect, in the order of magnitude of few cm3·mol?1, and the larger negative values of cyclization volumes, down to ?24 cm3·mol?1, are discussed in terms of packing and solute–solvent interactions, in analogy to polar organic solutes either in heptane and tetrachloromethane. A negative cyclization effect is also exhibited by the solvation enthalpies. 相似文献
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The densities, ρ 123, and speeds of sound, u 123, of ternary o-toluidine (OT, 1) + tetrahydropyran (THP, 2) + pyridine (Py) or benzene or toluene (3) mixtures have been measured as a function of composition at 298.15, 303.15 and 308.15 K. Values of the excess molar volumes, $ V_{123}^{\text{E}} , $ and excess isentropic compressibilities, $ (\kappa_{\text{S}}^{\text{E}} )_{123} , $ of the studied mixtures have been determined by employing the measured experimental data. The observed thermodynamic properties were fitted with the Redlich–Kister equation to determine adjustable ternary parameters and standard deviations. The $ V_{123}^{\text{E}} $ and $ (\kappa_{\text{S}}^{\text{E}} )_{123} $ values were also analyzed in terms of Graph theory. It was observed that Graph theory correctly predicts the sign as well as magnitude of $ V_{123}^{\text{E}} $ and $ (\kappa_{\text{S}}^{\text{E}} )_{123} $ values of the investigated mixtures. Analysis of the data suggests strong interactions and a more close packed arrangement in OT (1) + THP (2) + Py (3) mixtures as compared to those of the OT (1) + THP (2) + benzene (3) or toluene (3) mixtures. This may be due to the presence of a nitrogen atom in Py which results in stronger interactions for the OT:THP molecular entity as compared to those with benzene or toluene. 相似文献
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Phase equilibria of the quaternary NaCl–NaBr–Na2SO4–H2O system at 323 K were studied by the isothermal dissolution equilibrium method. The solubilities of salts and densities of saturated solutions were determined. Solid solutions [Na(Cl, Br)] were found in the experiments. The phase diagram of the quaternary system has no invariant point, but has one univariant curve at the boundary of Na(Cl, Br) and Na2SO4 crystallization fields. The experimental results show that an increase of the NaBr concentration is accompanied by an obvious increase of the solution density and the decrease of the solubilities of NaCl and Na2SO4. 相似文献
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Zhanping Qiao Lihong Zhuo Xin Chen Hui Wang 《Russian Journal of Inorganic Chemistry》2008,53(3):446-449
The equilibrium solubility of the quaternary system TbCl3-CdCl2-HCl(7.92 mas. %)-H2O was determined at 298K and the corresponding equilibrium diagram was constructed. The quaternary system is complicated by
the three equilibrium solid phases: CdCl2 · H2O, TbCd4Cl11 · 14H2O (4: 1 type), and TbCl3 · 6H2O, of which the new compound Cd4TbCl11 · 14H2O was found to be congruently soluble in the system. The new compound obtained was identified and characterized by the method
of X-ray diffraction and the thermal analysis methods of thermogravimetry-differential thermogravimetry (TG-DTG).
This article was submitted by the authors in English. 相似文献
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《Fluid Phase Equilibria》2002,202(2):221-231
The mixed aqueous electrolyte system magnesium and manganese sulfate has been studied with the hygrometric method at the temperature 298.15 K. The relative humidity of this system is measured at total molalities from 0.2 mol kg−1 to about saturation of one of the solutes for different ionic-strength fractions y of MgSO4 with y=0.2, 0.5 and 0.8. The obtained data allow the deduction of new thermodynamic parameters. The experimental results are compared with the predictions of ZSR rule. From these measurements, the new Pitzer mixing ionic parameters are determined and used to predict the solute activity coefficients in the mixture. The obtained results are used to calculate the excess Gibbs energy at total molalities for different ionic-strength fractions y of MgSO4. 相似文献
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