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Measurements and Calculations of Phase Equilibria in the Quaternary Systems NaCl–MgCl2–SrCl2–H2O and KCl–MgCl2–SrCl2–H2O at 298.2 K
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2024-01-23 , DOI: 10.1021/acs.jced.3c00446
Wei Zheng 1 , Shi-Hua Sang 1 , Xiao-Feng Guo 1 , Guang Tan 1 , Guo-Liang Nie 1
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2024-01-23 , DOI: 10.1021/acs.jced.3c00446
Wei Zheng 1 , Shi-Hua Sang 1 , Xiao-Feng Guo 1 , Guang Tan 1 , Guo-Liang Nie 1
Affiliation
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Underground brines are important liquid mineral resources, and the phase equilibria of the salt–water system on underground brines are conducive to the development and utilization of the rich mineral resources in brines. The phase equilibrium studies of the quaternary systems NaCl–MgCl2–SrCl2–H2O and KCl–MgCl2–SrCl2–H2O at 298.2 K were carried out using the isothermal dissolution equilibrium method. The solubility of each salt in the equilibrium liquid phase was measured, and the corresponding equilibrium solid phases were identified by XRD. The results showed that the quaternary system NaCl–MgCl2–SrCl2–H2O contained five isothermal solubility univariate curves, two invariant points, and four equilibrium solid-phase crystallization regions (SrCl2·2H2O, SrCl2·6H2O, MgCl2·6H2O, and NaCl). The phase diagram in the quaternary system KCl–MgCl2–SrCl2–H2O has three invariant points, seven isothermal solubility univariate curves, and five equilibrium solid-phase crystallization regions (SrCl2·6H2O, SrCl2·2H2O, MgCl2·6H2O, KCl·MgCl2·6H2O, and KCl). The phase equilibrium relationships of these two quaternary systems at different temperatures were also analyzed detailedly. Furthermore, the Pitzer model was used to calculate the solubilities of salts in the above systems. The calculations and experimental results are compared, and the calculated phase diagram agrees well with the experimental phase diagram.
中文翻译：
298.2 K 下四元体系 NaCl-MgCl2-SrCl2-H2O 和 KCl-MgCl2-SrCl2-H2O 相平衡的测量和计算
地下卤水是重要的液体矿产资源，地下卤水盐水系统的相平衡有利于卤水丰富矿产资源的开发利用。采用等温溶解平衡法对四元体系 NaCl–MgCl 2 –SrCl 2 –H 2 O 和 KCl–MgCl 2 –SrCl 2 –H 2 O 在 298.2 K 下进行了相平衡研究。测量每种盐在平衡液相中的溶解度，并通过 XRD 鉴定相应的平衡固相。结果表明，四元体系NaCl–MgCl 2 –SrCl 2 –H 2 O包含5条等温溶解度单变量曲线、2个不变点和4个平衡固相结晶区(SrCl 2 ·2H 2 O、SrCl 2 ·6H 2 O、MgCl 2 ·6H 2 O、和NaCl)。四元体系KCl–MgCl 2 –SrCl 2 –H 2 O的相图具有3个不变点、7条等温溶解度单变量曲线和5个平衡固相结晶区(SrCl 2 ·6H 2 O、SrCl 2 ·2H 2 O、MgCl 2 ·6H 2 O、KCl·MgCl 2 ·6H 2 O、KCl)。还详细分析了这两个四元体系在不同温度下的相平衡关系。此外，Pitzer模型用于计算上述体系中盐的溶解度。将计算结果与实验结果进行对比，计算相图与实验相图吻合较好。
更新日期：2024-01-23
中文翻译：
298.2 K 下四元体系 NaCl-MgCl2-SrCl2-H2O 和 KCl-MgCl2-SrCl2-H2O 相平衡的测量和计算
地下卤水是重要的液体矿产资源，地下卤水盐水系统的相平衡有利于卤水丰富矿产资源的开发利用。采用等温溶解平衡法对四元体系 NaCl–MgCl 2 –SrCl 2 –H 2 O 和 KCl–MgCl 2 –SrCl 2 –H 2 O 在 298.2 K 下进行了相平衡研究。测量每种盐在平衡液相中的溶解度，并通过 XRD 鉴定相应的平衡固相。结果表明，四元体系NaCl–MgCl 2 –SrCl 2 –H 2 O包含5条等温溶解度单变量曲线、2个不变点和4个平衡固相结晶区(SrCl 2 ·2H 2 O、SrCl 2 ·6H 2 O、MgCl 2 ·6H 2 O、和NaCl)。四元体系KCl–MgCl 2 –SrCl 2 –H 2 O的相图具有3个不变点、7条等温溶解度单变量曲线和5个平衡固相结晶区(SrCl 2 ·6H 2 O、SrCl 2 ·2H 2 O、MgCl 2 ·6H 2 O、KCl·MgCl 2 ·6H 2 O、KCl)。还详细分析了这两个四元体系在不同温度下的相平衡关系。此外，Pitzer模型用于计算上述体系中盐的溶解度。将计算结果与实验结果进行对比，计算相图与实验相图吻合较好。
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