Phase Equilibria in the Ternary System (LiCl + Li2SO4 + H2O) at T = (288.15 and 308.15) K: Experimental Determination and Model Simulation

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• 作者：Shiqiang Wang ; Xunian Han ; Yan Jing ; Yafei Guo ; Meiling Zhao ; Tianlong Deng
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2016
• 出版时间：March 10, 2016
• 年：2016
• 卷：61
• 期：3
• 页码：1155-1161
• 全文大小：372K
• ISSN：1520-5134

文摘

The solubilities and physicochemical properties, including density, refractive index, and pH, of the ternary system (LiCl + Li₂SO₄ + H₂O) at T = (288.15 and 308.15) K and p = 0.1 MPa were determined with the isothermal dissolution equilibrium method. The phase diagram in the ternary system at 288.15 K consists of one invariant point, two univariant solubility curves, and two crystallization regions corresponding to Li₂SO₄·H₂O and LiCl·H₂O. A similar structure can be found in this system at 308.15 K. This ternary system belongs to hydrate type I at two temperatures, and neither double salts nor solid solutions were formed at the investigated temperatures. The crystallized area of LiCl·H₂O decreases with increasing temperature, while that of Li₂SO₄·H₂O increases obviously. The solution density, refractive index, and pH value of the ternary system (LiCl + Li₂SO₄ + H₂O) at the two temperatures change regularly with the mass fraction of lithium. The Pitzer–Harvie–Weare thermodynamic model of aqueous electrolyte solutions was chosen to simulate the solubility of (LiCl + Li₂SO₄ + H₂O) at (288.15 and 308.15) K. Reasonable agreement between the predicted solubilities and experimental data was found.