Experimental Determination and Modeling of the Solubility Phase Diagram of the Quaternary System MgCl2+LiCl+NH4Cl+H2O at 298.15 K and Its Applications in Industry
Experimental Determination and Modeling of the Solubility Phase Diagram of the Quaternary System MgCl2+LiCl+NH4Cl+H2O at 298.15 K and Its Applications in Industry
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DOI：
10.1021/ie4027555
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发表时间：
2013-11
影响因子：
4.2
通讯作者：
Haitang Yang;D. Zeng;Tengyu Liang;Xia Yin;Qi-yuan Chen
中科院分区：
文献类型：
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作者：
Haitang Yang;D. Zeng;Tengyu Liang;Xia Yin;Qi-yuan Chen
用等温平衡法测定了MgCl_2 +LiCl+ NH_4Cl + H_2 O四元体系在298.15 K时的溶解度等温线及相应的固相。在该体系中存在四个结晶区，即两个复盐区（LiCl·MgCl 2·7 H2O（s）和NH 4Cl·MgCl 2·6 H2O（s））、一个水合盐区（MgCl 2·6 H2O（s））和一个固溶体区（LiCl·H2O+ NH 4Cl）（ss）。采用Pitzer-Simoson-Clegg（PSC）热力学模型对该四元体系及其子系统的热力学性质进行了模拟和预测。用PSC模型预测了MgCl_2 +LiCl+ H_2 O和LiCl+ NH_4Cl + H_2 O三元体系的水活度以及MgCl_2 +LiCl+ NH_4Cl + H_2 O四元体系的溶解度，并与文献数据和实验结果进行了比较。预测结果与实验结果吻合较好，表明本工作中得到的溶解度结果是可靠的。在四分之一的基础上...
Solubility isotherms as well as the corresponding solid phases of the quaternary system MgCl2+LiCl+NH4Cl+H2O at 298.15 K have been elaborately measured by an isothermal equilibrium method. Four crystallization fields including two double salts (LiCl·MgCl2·7H2O(s) and NH4Cl·MgCl2·6H2O(s)), one hydrate salt (MgCl2·6H2O(s)), and one solid-solution (LiCl·H2O+NH4Cl)(ss) were detected in this system. A Pitzer-Simoson-Clegg (PSC) thermodynamic model was used to simulate and predict the thermodynamic properties of this quaternary system and its subsystems. The water activities of the ternary systems MgCl2+LiCl+H2O and LiCl+NH4Cl+H2O, as well as the solubility of the quaternary system MgCl2+LiCl+NH4Cl+H2O, were predicted by the PSC model, the results of which were compared with available literature data and the experimental results in this work. The excellent agreement between the predicted and experimental results indicates that the solubility results obtained in this work are reliable. On the basis of the quater...