Thermodynamic Properties of the β-Diketone–ZnSO4–(NH4)2SO4–NH3(aq)–H2O System

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• 作者：Qinxiang Li ; Mark Zhu ; Huiping Hu ; Zhiying Ding ; Zhoulan Yin
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2016
• 出版时间：April 14, 2016
• 年：2016
• 卷：61
• 期：4
• 页码：1585-1591
• 全文大小：393K
• 年卷期：0
• ISSN：1520-5134

文摘

Solubility of β-diketone (4-ethyl-1-phenyl-1, 3-octadione, abbreviated as HA, C₁₆H₂₂O₂, molecular weight, 246.34)–ZnSO₄–(NH₄)₂SO₄–NH_3(aq)–H₂O system at T = (298.15, 308.15) K is elaborately measured by isothermal method. The results show that the solubility of ZnA_2(o), NH₄A_(o), H₂O_(o), Zn²⁺_(w), NH₄⁺_(w), SO₄^2–_(w), and HA_(w) increases with the increase of the concentration of zinc sulfate. In contrast, the solubility of HA_(o), H₂O_(w), and NH_3(w) decreases with the increase of the concentration of zinc sulfate. The distribution ratio and extraction equilibrium isotherm of zinc in extraction system are obtained at T = (298.15, 308.15) K. The consequence indicates that extraction equilibrium isotherm is connected with temperature, and at the same condition, the distribution ratio of Zn(II) at 298.15 K is greater than 308.15 K. The activity coefficient of the components in mixture electrolyte solutions is calculated by Pitzer model, and the activity coefficient in organic phase is gained by correlating the extraction thermodynamic equilibrium constant with Gibbs–Duhem formula.