Measurements and Calculations of Solid-liquid Equilibria in Quaternary System Li2SO4-Na2SO4-K2SO4-H2O at 288 K

doi:10.1007/s40242-017-6275-y

高等学校化学研究 ›› 2017, Vol. 33 ›› Issue (3): 460-465.doi: 10.1007/s40242-017-6275-y

Measurements and Calculations of Solid-liquid Equilibria in Quaternary System Li₂SO₄-Na₂SO₄-K₂SO₄-H₂O at 288 K

CUI Ruizhi, YANG Lei, WANG Wei, SANG Shihua

College of Materials and Chemistry & Chemical Engineering, Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions, Chengdu University of Technology, Chengdu 610059, P. R. China

收稿日期:2016-06-28 修回日期:2017-02-20 出版日期:2017-06-01 发布日期:2017-04-01
通讯作者: SANG Shihua,E-mail:sangsh@cdut.edu.cn E-mail:sangsh@cdut.edu.cn
基金资助:
Supported by the National Natural Science Foundation of China(Nos.U1407108, 41373062) and the Scientific Research and Innovation Team in Universities of Sichuan Provincial Department of Education, China(No.15TD0009).

Measurements and Calculations of Solid-liquid Equilibria in Quaternary System Li₂SO₄-Na₂SO₄-K₂SO₄-H₂O at 288 K

CUI Ruizhi, YANG Lei, WANG Wei, SANG Shihua

College of Materials and Chemistry & Chemical Engineering, Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions, Chengdu University of Technology, Chengdu 610059, P. R. China

Received:2016-06-28 Revised:2017-02-20 Online:2017-06-01 Published:2017-04-01
Contact: SANG Shihua,E-mail:sangsh@cdut.edu.cn E-mail:sangsh@cdut.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(Nos.U1407108, 41373062) and the Scientific Research and Innovation Team in Universities of Sichuan Provincial Department of Education, China(No.15TD0009).

摘要/Abstract

摘要：

The isothermal dissolution equilibrium method has been used to investigate the solid and liquid equilibria of quaternary system Li₂SO₄-Na₂SO₄-K₂SO₄-H₂O at 288 K. The phase diagram and water diagram were plotted according to the experiment results. It was found that Li₂SO₄-Na₂SO₄-K₂SO₄-H₂O quaternary system contains four double salts at 288 K. There are six invariant points, twelve univariant curves and seven areas of crystallization:Li₂SO₄·H₂O, Na₂SO₄·10H₂O, K₂SO₄, Li₂SO₄·3Na₂SO₄·12H₂O, Li₂SO₄·K₂SO₄, Na₂SO₄·3K₂SO₄, 2Li₂SO₄·Na₂SO₄· K₂SO₄. Using the equilibrium solubility data of the quaternary system at 288 K, the solubility product(lnK_sp) of solid phase 2Li₂SO₄·Na₂SO₄·K₂SO₄, which is not reported was acquired. Based on the chemical model of Pitzer's electrolyte solution theory, the solubilities for the quaternary system Li₂SO₄-Na₂SO₄-K₂SO₄-H₂O at 288 K were calculated with corresponding parameters. Compared the results of experimental measurement with those of calculation, it was shown that the calculated values had a good agreement with the experimental ones.

关键词: Salt-water system, Phase equilibrium, Solubility, Sulfate, Pitzer's equation

Abstract:

Key words: Salt-water system, Phase equilibrium, Solubility, Sulfate, Pitzer's equation

CUI Ruizhi, YANG Lei, WANG Wei, SANG Shihua. Measurements and Calculations of Solid-liquid Equilibria in Quaternary System Li₂SO₄-Na₂SO₄-K₂SO₄-H₂O at 288 K[J]. 高等学校化学研究, 2017, 33(3): 460-465.

CUI Ruizhi, YANG Lei, WANG Wei, SANG Shihua. Measurements and Calculations of Solid-liquid Equilibria in Quaternary System Li₂SO₄-Na₂SO₄-K₂SO₄-H₂O at 288 K[J]. Chemical Research in Chinese Universities, 2017, 33(3): 460-465.

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Measurements and Calculations of Solid-liquid Equilibria in Quaternary System Li₂SO₄-Na₂SO₄-K₂SO₄-H₂O at 288 K

Measurements and Calculations of Solid-liquid Equilibria in Quaternary System Li₂SO₄-Na₂SO₄-K₂SO₄-H₂O at 288 K

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