Phase Equilibrium for the Ternary Systems (KCl + K2SO4 + H2O) and (KH2PO4 + K2SO4 + H2O) at 288.15 K and Atmospheric Pressure

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• 作者：Wei Liu ; Jun Zhou ; Zi-wei Zhang ; Shuang Chen ; Shang-yu Liu
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2016
• 出版时间：June 9, 2016
• 年：2016
• 卷：61
• 期：6
• 页码：2083-2087
• 全文大小：275K
• 年卷期：0
• ISSN：1520-5134

文摘

The phase equilibrium of (KCl + K₂SO₄ + H₂O) and (KH₂PO₄ + K₂SO₄ + H₂O) at 288.15 K is studied by isothermal solution saturation method and wet residues. The equilibrium solid phases are analyzed by the Schreinemaker’s method of wet residues and verified by X-ray diffraction (XRD). On the basis of the experimental data, the diagram of density versus composition and the phase diagram are plotted. The crystallization regions are determined. In the two systems, KCl and KH₂PO₄ have a strong salting-out effect on K₂SO₄, and the salting-out effect of KCl on K₂SO₄ is stronger than that of KH₂PO₄ on K₂SO₄. There are in all two crystalline regions, two univariant curves, and one invariant point. The crystalline region of K₂SO₄ is the largest, whereas that of KCl is the smallest. All results can offer fundamental data support for optimizing processes and further theoretical studies.