Solid鈥揕iquid Metastable Phase Equilibria in the Five-Component System (Li + Na + K + Cl + SO4 + H2O) at 308.15 K

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• 作者：Yuanhui Liu ; Yafei Guo ; Xiaoping Yu ; Shiqiang Wang ; Tianlong Deng
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2014
• 出版时间：May 8, 2014
• 年：2014
• 卷：59
• 期：5
• 页码：1685-1691
• 全文大小：323K
• 年卷期：v.59,no.5(May 8, 2014)
• ISSN：1520-5134

文摘

The metastable equilibrium solubilities and the physicochemical properties including refractive index, density, viscosity, conductivity, and pH for the aqueous reciprocal five-component system (Li + Na + K + Cl + SO₄ + H₂O) at 308.15 K were studied using the isothermal evaporation method. According to the experimental data, the dry-salt-phase diagram, sodium-phase diagram, water-phase diagram, and the diagrams of physicochemical properties versus composition were plotted. The dry-salt-phase diagram of the five-component system includes seven four-salt cosaturated points, fourteen univariant solubility curves, and eight crystallization zones all saturated with sodium chloride. Three kinds of double salts of lithium salts (Db1, Li₂SO₄路3Na₂SO₄路12H₂O; Db2, Li₂SO₄路Na₂SO₄; Db3, 2Li₂SO₄路Na₂SO₄路K₂SO₄) were found, and no solid solution was formed in the metastable five-component system. Because the Pitzer mixing ion-interaction parameters containing lithium and sodium such as 胃_Li,Na, 唯_Li,Na,Cl, and 唯_Li,Na,SO4 at 308.15 K are scarce, the solubilities of the five-component system at 298.15 K were calculated on the basis of Pitzer鈥檚 ion-interaction theory and the chemical equilibrium Harvie鈥揗酶ller鈥揥eare model (HMW model). A comparison of the calculated phase diagram at 298.15 K and the experimental phase diagram at 308.15 K was also carried out.