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Solid-liquid metastable equilibria in the quaternary system (NaCl-KCl-CaCl2-H2O) at 288.15 K
Deng, Tianlong1,2; Li, Dongchan1,2
AbstractThe solubilities and the physicochemical properties (densities, viscosities, refractive indices, conductivities, and pH) in the liquid-solid metastable system (NaCl-KCl-CaCl2-H2O) at 288.15K have been studied using the isothermal evaporation method. Based on the experimental data, the dry-salt phase diagram, water-phase diagram and the diagram of physicochemical properties vs. composition in the system were plotted. The dry-salt phase diagram of the system includes one three-salt co-saturated point, three metastable solubility isotherm curves, and three crystallization regions corresponding to sodium chloride, potassium chloride and calcium chloride hexahydrate. Neither solid solution nor double salts were found. Based on the extended Harvie-Weare (HW) model and its tempera ture-dependent equation, the values of the Pitzer parameters beta((0)), beta((1)), C-phi for NaCl, KCl and CaCl2, the mixed ion-interaction parameters theta(Na,K), theta(Na,Ca), theta(K,Ca), Psi(Na,K,Cl), Psi(K,Ca,Cl), the Debye-Huckel parameter A(phi) and the standard chemical potentials of the minerals in the quaternary system at 288.15 K were obtained. In addition, the average equilibrium constants of metastable equilibrium solids at the same temperature were obtained using a method derived from the activity product constant for the metastable system. Using the standard chemical potentials of the minerals and the average equilibrium constants of solids at equilibrium, the solubility predictions for the quaternary system are presented. A comparison between the calculated and experimental results shows that the predicted solubilities obtained with the extended HW model using the average equilibrium constants agree well with experimental data. (c) 2008 Elsevier B.V. All rights reserved.
KeywordMetastable Phase Equilibrium Phase Diagram Solubility Pitzer Modeling
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
Indexed BySCI
WOS Research AreaThermodynamics ; Chemistry ; Engineering
WOS SubjectThermodynamics ; Chemistry, Physical ; Engineering, Chemical
WOS IDWOS:000258047500014
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Document Type期刊论文
Affiliation1.Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810008, Qinghsi, Peoples R China
2.Chengdu Univ Technol, Coll Mat Chem & Chem Engn, Chengdu 610059, Peoples R China
Recommended Citation
GB/T 7714
Deng, Tianlong,Li, Dongchan. Solid-liquid metastable equilibria in the quaternary system (NaCl-KCl-CaCl2-H2O) at 288.15 K[J]. FLUID PHASE EQUILIBRIA,2008,269(1-2):98-103.
APA Deng, Tianlong,&Li, Dongchan.(2008).Solid-liquid metastable equilibria in the quaternary system (NaCl-KCl-CaCl2-H2O) at 288.15 K.FLUID PHASE EQUILIBRIA,269(1-2),98-103.
MLA Deng, Tianlong,et al."Solid-liquid metastable equilibria in the quaternary system (NaCl-KCl-CaCl2-H2O) at 288.15 K".FLUID PHASE EQUILIBRIA 269.1-2(2008):98-103.
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