Simulation studies on metastable phase equilibria in the aqueous ternary systems (NaCl-MgCl2-H2O) and (KCl-MgCl2-H2O) at 308.15 K

doi:10.1007/s11705-009-0048-1

Front Chem Eng Chin

2009, Vol. 3

Issue (2) : 172-175 https://doi.org/10.1007/s11705-009-0048-1

RESEARCH ARTICLE

Simulation studies on metastable phase equilibria in the aqueous ternary systems (NaCl-MgCl₂-H₂O) and (KCl-MgCl₂-H₂O) at 308.15 K

Tianlong DENG^1,2(

), Baojun ZHANG², Dongchan LI², Yafei GUO¹

1. Key Laboratory of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China; 2. College of Materials, Chemistry and Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China

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Abstract

The solubilities and densities of the aqueous metastable ternary systems (NaCl-MgCl₂-H₂O) and (KCl-MgCl₂-H₂O) at 308.15 K were determined by the isothermal evaporation method. On the basis of the experimental results, the phase diagrams for those systems were plotted. It was found that the former system belongs to the hydrate-I type with one invariant point of (NaCl+ MgCl₂?6H₂O), two univariant curves, and two crystallization regions corresponding to halite (NaCl) and bischofite (MgCl₂·6H₂O); and the latter system belongs to the type of incongruent-double salts with two invariant points of (KCl+ KCl·MgCl₂·6H₂O) and (MgCl₂·6H₂O+ KCl·MgCl₂·6H₂O), three univariant curves, and three crystallization regions corresponding to potassium chloride (KCl), carnallite (KCl·MgCl₂·6H₂O) and bischofite (MgCl₂·6H₂O). No solid solutions were found in both systems.

Keywords green chemistry solar pond technique simulation metastable phase equilibrium solubility

Corresponding Author(s): DENG Tianlong,Email:tldeng@isl.ac.cn

Issue Date: 05 June 2009

Cite this article:

Tianlong DENG,Baojun ZHANG,Dongchan LI, et al. Simulation studies on metastable phase equilibria in the aqueous ternary systems (NaCl-MgCl₂-H₂O) and (KCl-MgCl₂-H₂O) at 308.15 K[J]. Front Chem Eng Chin, 2009, 3(2): 172-175.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-009-0048-1
https://academic.hep.com.cn/fcse/EN/Y2009/V3/I2/172

Tab.1 Metastable solubility and density of the system (KCl-MgCl-HO) at 308.15 K

Tab.2 Metastable solubility and density of the system (NaCl-MgCl-HO) at 308.15 K

Fig.1 Metastable phase diagram (KCl-MgCl-HO) at 308.15 K. ● experimental points; - isothermal solubility curves; Bis MgCl·6HO; Car KCl·MgCl·6HO

Fig.2 Metastable phase diagram (NaCl-MgCl-HO) at 308.15 K. ● experimental points; - isothermal metastable solubility curves; Bis MgCl·6HO

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