Metastable Phase Equilibrium in the Reciprocal Quaternary System LiCl+MgCl2+Li2SO4+MgSO4+H2O at 348.15 K and 0.1 MPa

doi:10.1007/s40242-018-7407-8

高等学校化学研究 ›› 2018, Vol. 34 ›› Issue (5): 798-802.doi: 10.1007/s40242-018-7407-8

Metastable Phase Equilibrium in the Reciprocal Quaternary System LiCl+MgCl₂+Li₂SO₄+MgSO₄+H₂O at 348.15 K and 0.1 MPa

YU Xiaoping^1,2, WANG Qin¹, GUO Yafei^1,2, DENG Tianlong¹

1. Tianjin Key Laboratory of Marine Resources and Chemistry, College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, Tianjin 300457, P. R. China;
2. College of Chemistry and Materials Science, Northwest University, Xi'an 710127, P. R. China

收稿日期:2017-12-13 修回日期:2018-02-05 出版日期:2018-10-01 发布日期:2018-04-10
通讯作者: DENG Tianlong,Email:tldeng@tust.edu.cn E-mail:tldeng@tust.edu.cn
基金资助:
Supported by the National Natural Science Foundation of China(Nos.U1607129, U1607123, 21773170), the China Postdoctoral Science Foundation(Nos.2016M592827, 2016M592828), the Application Foundation and Advanced Technology Program of Tianjin, China(No.15JCQNJC08300), and the Yangtze Scholars and Innovative Research Team of the Chinese University(No.IRT-17R81).

Metastable Phase Equilibrium in the Reciprocal Quaternary System LiCl+MgCl₂+Li₂SO₄+MgSO₄+H₂O at 348.15 K and 0.1 MPa

YU Xiaoping^1,2, WANG Qin¹, GUO Yafei^1,2, DENG Tianlong¹

1. Tianjin Key Laboratory of Marine Resources and Chemistry, College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, Tianjin 300457, P. R. China;
2. College of Chemistry and Materials Science, Northwest University, Xi'an 710127, P. R. China

Received:2017-12-13 Revised:2018-02-05 Online:2018-10-01 Published:2018-04-10
Contact: DENG Tianlong,Email:tldeng@tust.edu.cn E-mail:tldeng@tust.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(Nos.U1607129, U1607123, 21773170), the China Postdoctoral Science Foundation(Nos.2016M592827, 2016M592828), the Application Foundation and Advanced Technology Program of Tianjin, China(No.15JCQNJC08300), and the Yangtze Scholars and Innovative Research Team of the Chinese University(No.IRT-17R81).

摘要/Abstract

摘要： The metastable solubilities and the physicochemical properties including density and pH of the reciprocal quaternary system(LiCl+MgCl₂+Li₂SO₄+MgSO₄+H₂O) at 348.15 K and 0.1 MPa were determined using the isothermal evaporation method. The dry-salt diagram and water-phase diagram were plotted based on the experimental data. There are five invariant points, eleven univariant curves, and seven crystallization zones corresponding to hexahydrite, tetrahydrite, kieserite, bischofite, lithium sulfate monohydrate, lithium chloride monohydrate and lithium carnallite. Comparison between the stable and metastable diagrams at 348.15 K indicates that the metastable phenomenon of magnesium sulfate is obvious, and the crystallization regions of hexahydrite and tetrahydrite disappear in the stable phase diagram. A comparison of the metastable dry-salt phase diagrams at 308.15, 323.15 and 348.15 K shows that with the increasing of temperature the epsomite crystallization zone disappears from the dry-salt phase diagram of 303.15 K, and a new kieserite crystallization zone is presented at 348.15 K. The density and pH in the metastable equilibrium solution present regular change with the increasing of Jänecke index J(2Li⁺), and the calculated densities using the empirical equation agree well with the experimental values.

关键词: Phase equilibrium, Phase diagram, Solubility, Quaternary system, Lithium salt

Abstract: The metastable solubilities and the physicochemical properties including density and pH of the reciprocal quaternary system(LiCl+MgCl₂+Li₂SO₄+MgSO₄+H₂O) at 348.15 K and 0.1 MPa were determined using the isothermal evaporation method. The dry-salt diagram and water-phase diagram were plotted based on the experimental data. There are five invariant points, eleven univariant curves, and seven crystallization zones corresponding to hexahydrite, tetrahydrite, kieserite, bischofite, lithium sulfate monohydrate, lithium chloride monohydrate and lithium carnallite. Comparison between the stable and metastable diagrams at 348.15 K indicates that the metastable phenomenon of magnesium sulfate is obvious, and the crystallization regions of hexahydrite and tetrahydrite disappear in the stable phase diagram. A comparison of the metastable dry-salt phase diagrams at 308.15, 323.15 and 348.15 K shows that with the increasing of temperature the epsomite crystallization zone disappears from the dry-salt phase diagram of 303.15 K, and a new kieserite crystallization zone is presented at 348.15 K. The density and pH in the metastable equilibrium solution present regular change with the increasing of Jänecke index J(2Li⁺), and the calculated densities using the empirical equation agree well with the experimental values.

Key words: Phase equilibrium, Phase diagram, Solubility, Quaternary system, Lithium salt

YU Xiaoping, WANG Qin, GUO Yafei, DENG Tianlong. Metastable Phase Equilibrium in the Reciprocal Quaternary System LiCl+MgCl₂+Li₂SO₄+MgSO₄+H₂O at 348.15 K and 0.1 MPa[J]. 高等学校化学研究, 2018, 34(5): 798-802.

YU Xiaoping, WANG Qin, GUO Yafei, DENG Tianlong. Metastable Phase Equilibrium in the Reciprocal Quaternary System LiCl+MgCl₂+Li₂SO₄+MgSO₄+H₂O at 348.15 K and 0.1 MPa[J]. Chemical Research in Chinese Universities, 2018, 34(5): 798-802.

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Metastable Phase Equilibrium in the Reciprocal Quaternary System LiCl+MgCl₂+Li₂SO₄+MgSO₄+H₂O at 348.15 K and 0.1 MPa

Metastable Phase Equilibrium in the Reciprocal Quaternary System LiCl+MgCl₂+Li₂SO₄+MgSO₄+H₂O at 348.15 K and 0.1 MPa

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