Solid–Liquid Equilibria in the Quinary system Na+, K+//Cl–, Br–, SO42––H2O at 373 K

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• 作者：Rui-Zhi Cui ; Shi-Hua Sang ; Qian Liu
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2016
• 出版时间：January 14, 2016
• 年：2016
• 卷：61
• 期：1
• 页码：444-449
• 全文大小：318K
• ISSN：1520-5134

文摘

Solid–liquid equilibria in the quinary system Na⁺, K⁺//Cl^–, Br^–, SO₄^2––H₂O at 373 K were measured by the isothermal solution saturation method, and the equilibrium solid phases, solubilities and densities of saturated solutions were determined experimentally. Using the experimental results, the dry salt phase diagrams, water diagrams, and the densities versus composition diagrams were plotted (saturated with Na₂SO₄ and K₂SO₄, respectively). The experimental results show that there is solid solution formed in the quinary system Na⁺, K⁺//Cl^–, Br^–, SO₄^2––H₂O at 373 K. The two projected phase diagrams of this system all consist of one univariant curve, two crystallization fields, and have no invariant point. Saturated with the salt Na₂SO₄, the crystallization forms are the double salt Na₂SO₄·3K₂SO₄ (Gla) and the solid solution Na(Cl,Br); the two crystallization forms are Na₂SO₄·3K₂SO₄ (Gla) and the solid solution K(Cl,Br) saturated with the salt K₂SO₄.