期刊论文详细信息
JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
Thermodynamic Phase Equilibria of the Aqueous Ternary System (LiCl+LiBO2+H2O) at 308 K: Experimental Data and Predictions Using the Pitzer Model
Yuanhui Yuan1  Tianlong Deng1  Shiqiang Wang1  Yafei Guo1  Nan Zhang1 
[1] Tianjin Key Laboratory of Marine Resources and Chemistry, College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology
关键词: Phase Equilibria;    Solubility;    Lithium Chloride;    Lithium Metaborate;   
DOI  :  10.1252/jcej.15we045
来源: Maruzen Company Ltd
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【 摘 要 】

References(22)Solubilities and physicochemical properties including density, pH value, refractive index and conductivity of a ternary system (LiCl+LiBO2+H2O) at 308 K were determined with the isothermal dissolution equilibrium method. Two hydrates of lithium metaborate, i.e., lithium metaborate octahydrate (LiBO2·8H2O, Lb1) and lithium metaborate dihydrate (LiBO2·2H2O, Lb2), in the ternary system are found for the first time. On the basis of the experimental data, the phase diagram and the physiochemical properties versus composition diagram in the ternary system at 308 K were plotted. There are two invariant points of (Lb1+Lb2) and (Lb2+Lc), three univariant curves, and three crystallizing zones correspond to Lb1, Lb2 and lithium chloride monohydrate (LiCl·H2O, Lc). Physicochemical properties (density, pH, refractive index and conductivity) in the ternary system change regularly with the increasing of lithium chloride mass fraction in the solution. Based on the Pitzer ion-interaction model and its extended HW model, the Pitzer single-salt parameters of LiBO2 and LiCl, and the mixing ion-interaction parameters (θB(OH)4, Cl, ψLi, B(OH)4, Cl) were parameterized, which are not reported in the literature. The calculated values of the ternary system at 308 K agree well with the experimental results.

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