Isopiestic Determination of the Osmotic and Activity Coefficients of Aqueous Mixtures of Li&lt;SUB&gt;2&lt;/SUB&gt;SO&lt;SUB&gt;4&lt;/SUB&gt; and MgSO&lt;SUB&gt;4&lt;/SUB&gt;

张忠,; 姚燕,; 宋彭生,; 陈敬清,

doi:10.3866/pku.whxb19930315

Cited by 14 publications

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“…However, at total molalities above 3, the isopiestic lines positively deviate from the Zdanovskii rule line (dash lines in Figures and ) and these deviations grow with increasing concentration at both temperatures. This positive deviation phenomenon was also observed for the Li 2 SO 4 –MgSO 4 –H 2 O system at 298.15 K reported by Zhang …”

Section: Discussionsupporting

confidence: 83%

Isopiestic Measurements of Water Activity for the Li₂SO₄–MgSO₄–H₂O System at 323.15 and 373.15 K

et al. 2016

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The water activities for the binary Li 2 SO 4 −H 2 O and MgSO 4 − H 2 O, as well as the ternary Li 2 SO 4 −MgSO 4 −H 2 O systems at 323.15 and 373.15 K were elaborately determined by isopiestic measurements. The relative deviation of the isopiestic molality of parallel samples in each experimental run is better than 0.2%. The experimental water activities in the binary systems were compared with literature data and good agreement was found. The results obtained show that at salt concentration below 3 m the isopiestic composition lines of the Li 2 SO 4 −MgSO 4 −H 2 O system obey the Zdanovskii rule, whereas above 3 m the composition lines positively deviate from the Zdanovskii rule.

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Section: Discussionsupporting

confidence: 83%

Isopiestic Measurements of Water Activity for the Li₂SO₄–MgSO₄–H₂O System at 323.15 and 373.15 K

et al. 2016

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“…LiCl + MgSO 4 + H 2 O is a subsystem of the quaternary reciprocal system of Li + + Mg 2+ + Cl – + SO 4 2– + H 2 O, which occurs in many salt lake brines and ground brines of oil field and is important to the utilization of brine resources. The thermodynamic properties of the binary subsystems of LiCl + H 2 O, MgCl 2 + H 2 O, Li 2 SO 4 + H 2 O, and MgSO 4 + H 2 O have been extensively studied, and their models are available over a wide range of molality and temperature. − The ternary subsystems with a common ion like LiCl + MgCl 2 + H 2 O, Li 2 SO 4 + MgSO 4 + H 2 O, LiCl + Li 2 SO 4 + H 2 O, and MgCl 2 + MgSO 4 + H 2 O at T = 298.15 K have been measured. − Experimental redetermination and model simulation of the solubility phase diagram for the quaternary system of Li + , Mg 2+ //Cl – , SO 4 2– –H 2 O at 298.15 K and 323.15 K and the solubility phase diagram of the ternary system of MgCl 2 –MgSO 4 –H 2 O at (323.15 and 348.15) K have been reported. The thermodynamic properties and phase diagrams predicted by using the Pitzer ion interaction model for some seawater systems at various temperatures, , as well as for salt lake brine systems containing lithium at 298.15 K, have also been reported. − However, the studies for the salt lake brine system and its ternary subsystems containing lithium at a wide range of temperatures are lacking.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Properties of LiCl + MgSO₄ + H₂O at Temperatures from 273.15 K to 373.15 K and Representation with Pitzer Ion-Interaction Model

Zhang

Yao

et al. 2016

J. Chem. Eng. Data

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Osmotic coefficients, water activities, and vapor pressures for the systems of LiCl + H 2 O, MgSO 4 + H 2 O, and LiCl + MgSO 4 + H 2 O over the ionic strength ranges from I = (0.5552 to 7.0004, 4.1028 to 22.6048, and 1.1982 to 20.5863) mol·kg −1 respectively at T = (273.15, 298.15, 323.15, 348.15, and 373.15) K were determined by the isopiestic method with an improved simple apparatus. Aqueous CaCl 2 solution was chosen as a reference standard. The measured osmotic coefficients for the binary solutions of LiCl + H 2 O and MgSO 4 + H 2 O were in agreement with those from the literature. The experimental data of osmotic coefficients for the ternary mixtures were represented by using the Pitzer ion-interaction model; the expressions for the temperature dependencies of the model parameters were given. The standard deviations of all the measured osmotic coefficient data from those calculated by using the model over the temperature range were estimated. A set of model equations of apparent molar enthalpy and excess heat capacity for the mixtures as functions of molality and temperature were obtained by differentiating the model equations of excess Gibbs free energy. The mean activity coefficients, relative apparent molar enthalpies, and excess heat capacities were calculated by using the corresponding equations. The effects of composition and temperature on these thermodynamic properties were discussed.

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“…To parametrize a thermodynamic model, properties are needed for multiple temperatures of a multicomponent system, especially the water activity. Until now, most studies on water activity in multicomponent systems concerning salt lakes have been limited to 273.15 K and 298.15 K. − By improving the isopiestic apparatus, we have planned to measure systematically the water activity of multicomponent salt lake systems at higher temperatures. In the previous work, the water activity for the ternary systems NaCl(KCl)–MgCl 2 –H 2 O at 323.15 K was reported.…”

Section: Introductionmentioning

confidence: 99%

Water Activity Measurements by the Isopiestic Method for the MCl–CaCl₂–H₂O (M = Na, K) Systems at 323.15 K

Han

Guo

et al. 2015

J. Chem. Eng. Data

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In this work, the water activities of the NaCl−CaCl 2 − H 2 O and KCl−CaCl 2 −H 2 O ternary systems and of their sub-binary systems NaCl−H 2 O and KCl−H 2 O were measured using an isopiestic method at 323.15 K. The isopiestic composition line for the NaCl− CaCl 2 −H 2 O system was found to obey the Zdanovskii rule very well, whereas the KCl−CaCl 2 −H 2 O system deviated slightly. The addition of NaCl to an aqueous solution of CaCl 2 decreased its water activity for all CaCl 2 molalities. However, KCl was found to decrease and increase the water activity at low and high CaCl 2 molality, respectively. The turning point appears at 8.0 mol·kg −1 CaCl 2 solution. The Pitzer− Simonson−Clegg (PSC) model was applied to represent the water activity of the two ternary systems, and the calculated results are discussed.

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Isopiestic Determination of the Osmotic and Activity Coefficients of Aqueous Mixtures of Li<SUB>2</SUB>SO<SUB>4</SUB> and MgSO<SUB>4</SUB>

Cited by 14 publications

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Isopiestic Measurements of Water Activity for the Li₂SO₄–MgSO₄–H₂O System at 323.15 and 373.15 K

Isopiestic Measurements of Water Activity for the Li₂SO₄–MgSO₄–H₂O System at 323.15 and 373.15 K

Thermodynamic Properties of LiCl + MgSO₄ + H₂O at Temperatures from 273.15 K to 373.15 K and Representation with Pitzer Ion-Interaction Model

Water Activity Measurements by the Isopiestic Method for the MCl–CaCl₂–H₂O (M = Na, K) Systems at 323.15 K

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Isopiestic Determination of the Osmotic and Activity Coefficients of Aqueous Mixtures of Li<SUB>2</SUB>SO<SUB>4</SUB> and MgSO<SUB>4</SUB>

Cited by 14 publications

References 0 publications

Isopiestic Measurements of Water Activity for the Li2SO4–MgSO4–H2O System at 323.15 and 373.15 K

Isopiestic Measurements of Water Activity for the Li2SO4–MgSO4–H2O System at 323.15 and 373.15 K

Thermodynamic Properties of LiCl + MgSO4 + H2O at Temperatures from 273.15 K to 373.15 K and Representation with Pitzer Ion-Interaction Model

Water Activity Measurements by the Isopiestic Method for the MCl–CaCl2–H2O (M = Na, K) Systems at 323.15 K

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Isopiestic Measurements of Water Activity for the Li₂SO₄–MgSO₄–H₂O System at 323.15 and 373.15 K

Isopiestic Measurements of Water Activity for the Li₂SO₄–MgSO₄–H₂O System at 323.15 and 373.15 K

Thermodynamic Properties of LiCl + MgSO₄ + H₂O at Temperatures from 273.15 K to 373.15 K and Representation with Pitzer Ion-Interaction Model

Water Activity Measurements by the Isopiestic Method for the MCl–CaCl₂–H₂O (M = Na, K) Systems at 323.15 K