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Experimental Determination and Fitting of Solid–Liquid Equilibria in the Ternary System BaO–P2O5–H2O at 323.2 K
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2019-12-12 , DOI: 10.1021/acs.jced.9b00977 Zhuochao Zheng 1 , Jun Li 1 , Yang Jin 1 , Ming Chen 1
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2019-12-12 , DOI: 10.1021/acs.jced.9b00977 Zhuochao Zheng 1 , Jun Li 1 , Yang Jin 1 , Ming Chen 1
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In this work, solubilities and physicochemical properties including pH, density, and refractive index were studied by the isothermal dissolution equilibrium method for the ternary system BaO–P2O5–H2O at 323.2 K. The obtained ternary phase diagram contained seven invariant points, five univariant curves, and five crystallization regions, corresponding to Ba(OH)2·8H2O, [Ba5(PO4)3(OH)·(BaHPO4)1.5], [Ba5(PO4)3(OH)·(BaHPO4)8.5], BaHPO4, and Ba(H2PO4)2, respectively. Those crystals were characterized by X-ray diffraction and scanning electron microscopy. The estimation models were obtained by fitting the univariant curves corresponding to the crystallization regions of BaHPO4 and Ba(H2PO4)2. The properties including the refractive index, density, and mass fraction of P2O5 and BaO could be estimated by putting the pH into those models. The comparisons showed that the calculated values were in good coincidence with the experimental data. All the data and results obtained in this paper could be used to improve the desulfurization effect of wet-process phosphoric acid (WPA) and help WPA gradually replace thermal-process phosphoric acid.
中文翻译：
在323.2 K下三元体系BaO–P 2 O 5 –H 2 O中固液平衡的实验确定和拟合
在这项工作中，通过等温溶解平衡方法研究了在323.2 K下的三元体系BaO–P 2 O 5 –H 2 O的溶解度和理化性质，包括pH，密度和折射率。所获得的三元相图包含七个不变量点，五个单变量曲线和五个结晶区域，分别对应于Ba（OH）2 ·8H 2 O，[Ba 5（PO 4）3（OH）·（BaHPO 4）1.5 ]，[Ba 5（PO 4）3（OH）·（BaHPO 4）8.5 ]，BaHPO 4和Ba（H 2 PO 4）2。这些晶体通过X射线衍射和扫描电子显微镜表征。通过拟合与BaHPO 4和Ba（H 2 PO 4）2的结晶区域相对应的单变量曲线，获得估计模型。P 2 O 5的折射率，密度和质量分数可以通过将pH值放入这些模型来估算BaO。比较表明，计算值与实验数据吻合良好。本文获得的所有数据和结果可用于提高湿法磷酸（WPA）的脱硫效果，并帮助WPA逐步替代热法磷酸。
更新日期：2019-12-13
中文翻译：
在323.2 K下三元体系BaO–P 2 O 5 –H 2 O中固液平衡的实验确定和拟合
在这项工作中，通过等温溶解平衡方法研究了在323.2 K下的三元体系BaO–P 2 O 5 –H 2 O的溶解度和理化性质，包括pH，密度和折射率。所获得的三元相图包含七个不变量点，五个单变量曲线和五个结晶区域，分别对应于Ba（OH）2 ·8H 2 O，[Ba 5（PO 4）3（OH）·（BaHPO 4）1.5 ]，[Ba 5（PO 4）3（OH）·（BaHPO 4）8.5 ]，BaHPO 4和Ba（H 2 PO 4）2。这些晶体通过X射线衍射和扫描电子显微镜表征。通过拟合与BaHPO 4和Ba（H 2 PO 4）2的结晶区域相对应的单变量曲线，获得估计模型。P 2 O 5的折射率，密度和质量分数可以通过将pH值放入这些模型来估算BaO。比较表明，计算值与实验数据吻合良好。本文获得的所有数据和结果可用于提高湿法磷酸（WPA）的脱硫效果，并帮助WPA逐步替代热法磷酸。
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