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Solubility Phase Diagram of the Ternary System LiCl–MgCl2–H2O and Li2SO4–MgSO4–H2O at 348.15 K
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2020-12-02 , DOI: 10.1021/acs.jced.0c00807
Hongxia Li 1 , Lijiang Guo 2 , Fayan Zhu 3
Affiliation  

The solubility isotherms of the ternary systems LiCl–MgCl2–H2O and Li2SO4–MgSO4–H2O were elaborately redetermined at 348.15 K using an isothermal equilibrium method. The compositions of solid phases were confirmed using the Scherinemakers’ wet residue method. The ternary system LiCl–MgCl2–H2O is of a complex type with double salt LiCl·MgCl2·7H2O(s) formed at 348.15 K, it gives the data of two invariant points for the first time and points out the boundary of three univariant curves and three crystallization fields corresponding to LiCl·H2O(s), MgCl2·6H2O(s), and LiCl·MgCl2·7H2O(s) clearly, which is more complete and accurate than the results in the literature at 348.15 K. In the ternary system Li2SO4–MgSO4–H2O, there are three solubility branches corresponding to the solid phases MgSO4·nH2O(s) (n = 6 and 1) and Li2SO4·H2O(s); the phase field of MgSO4·H2O(s) overlaps with the phase field of MgSO4·6H2O(s), this finding indicates that the phase MgSO4·H2O(s) is stable and MgSO4·6H2O(s) is metastable; moreover, it gives the true equilibrium solubility data for MgSO4·H2O(s) in the binary system MgSO4–H2O and the ternary system Li2SO4–MgSO4–H2O at 348.15 K and an invariant point which can point out the boundary of the two phase fields of MgSO4·H2O(s) and Li2SO4·H2O(s) definitely.

中文翻译:

三元系LiCl–MgCl 2 –H 2 O和Li 2 SO 4 –MgSO 4 –H 2 O在348.15 K时的溶解相图

使用等温平衡法在348.15 K上重新确定了LiCl–MgCl 2 –H 2 O和Li 2 SO 4 –MgSO 4 –H 2 O三元体系的溶解等温线。固相的组成使用Scherinemakers的湿残留法确定。三元体系LiCl–MgCl 2 –H 2 O是复杂的类型,在348.15 K处形成了双盐LiCl·MgCl 2 ·7H 2 O (s),它首次给出了两个不变点的数据并指出LiCl·H 2对应的三个单变量曲线和三个结晶场的边界O (s),MgCl 2 ·6H 2 O (s)和LiCl·MgCl 2 ·7H 2 O (s)清晰可见,比文献中348.15 K的结果更完整和准确。在三元体系Li中2 SO 4 -MgSO 4 -H 2 O,存在三个固溶度分支,分别对应于固相MgSO 4 · n H 2 O (s)n = 6和1)和Li 2 SO 4 ·H 2 O (s) ; 硫酸镁的相场4 ·H 2 O (s)与MgSO 4 ·6H 2 O (s)的相场重叠,这一发现表明MgSO 4 ·H 2 O (s)相稳定,而MgSO 4 ·6H 2 O (s) )是亚稳的;此外,它给出了在二元体系MgSO 4 -H 2 O和三元体系Li 2 SO 4 -MgSO 4 -H 2中MgSO 4 ·H 2 O (s)的真实平衡溶解度数据。O在348.15 K处具有一个不变点,可以明确指出MgSO 4 ·H 2 O (s)和Li 2 SO 4 ·H 2 O (s)的两个相场的边界。
更新日期:2021-01-14
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