Measurement and Thermodynamic Modeling Study on the Solid and Liquid Equilibrium of Ternary System NaBr鈥揅aBr2鈥揌2O at 288.15 K

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• 作者：Lingzong Meng ; Dan Li ; Tianlong Deng ; Yafei Guo ; Cunyun Ma ; Youcai Zhu
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2014
• 出版时间：December 11, 2014
• 年：2014
• 卷：59
• 期：12
• 页码：4193-4199
• 全文大小：329K
• ISSN：1520-5134

文摘

The solubilities and refractive indices of the NaBr鈥揅aBr₂鈥揌₂O system at 288.15 K were determined using the isothermal equilibrium solution method. The phase diagram and refractive index diagram were drawn for this system at 288.15 K. The system belongs to the hydrate II type. The phase diagram is comprised of two invariant solubility points, three univariant solubility curves, and three areas of crystallization: NaBr路2H₂O, NaBr and CaBr₂路6H₂O. Using the temperature-dependent formulas from the literature, the Pitzer parameters and the solubility product constants (ln K_sp) of NaBr路2H₂O and NaBr were determined. Applying the Pitzer and Harvie鈥揥eare (HW) model, the solubility product constant of CaBr₂路6H₂O was fit with the solubilities in this research work, and then, the mean activity coefficients of sodium bromide and calcium bromide and the solubilities for the ternary system at 288.15 K were demonstrated. Comparisons between the calculated and measured solubilities show that the predicted data have good accordance with the experimental results.