Chemical Research in Chinese Universities

, Volume 34, Issue 5, pp 823–827 | Cite as

Metastable Phase Equilibrium of the Quaternary System Na+, Rb+, Mg2+//Cl-H2O at 298.2 K

  • Liting Wu
  • Ying ZengEmail author
  • Dongming Yan
  • Shan Feng
  • Xudong Yu


The component solubilities, densities and refractive indices of the quaternary system Na+, Rb+, Mg2+//Cl-H2O at 298.2 K were measured using an isothermal evaporation method. Based on the gathered data, a metastable phase diagram, a water content diagram, and a density/refractive index vs. composition diagram were constructed. The results show that this system is of a complex type with a double salt rubidium carnallite (RbCl·MgCl2·6H2O) formed at 298.2 K. Double salt rubidium carnallite, whose component point locates in its own crystallization zone in the dry salt phase diagram, belongs to congruent double salt at 298.2 K. Accompanied by the double salt that was formed, there are two invariant points in the phase diagram that cosaturated with three salts and an equilibrated solution. The cosaturated salts for the two invariant points are MgCl2·6H2O+RbCl·MgCl2·6H2O+ NaCl and NaCl+RbCl+RbCl·MgCl2·6H2O, respectively. Both invariant points are commensurate invariant points in the evaporation process, and the two invariant points are evaporative dry points. The sizes of the crystalline regions of the salts are in the order of NaCl>RbCl>RbCl·MgCl2·6H2O>MgCl2·6H2O.


Metastable phase equilibrium Rubidium carnallitite Quaternary system 


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Copyright information

© Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Liting Wu
    • 1
  • Ying Zeng
    • 1
    • 2
    Email author
  • Dongming Yan
    • 1
  • Shan Feng
    • 1
    • 2
  • Xudong Yu
    • 1
    • 2
  1. 1.College of Materials and Chemistry & Chemical EngineeringChengdu University of TechnologyChengduP. R. China
  2. 2.Collaborative Innovation Center of Panxi Strategic Mineral Resources Multi-Purpose UtilizationChengdu University of TechnologyChengduP. R. China

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