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Solubility determination and thermodynamic modeling of solid−liquid equilibria in the LiBO2−Li2B4O7−H2O system at 298.15 K and 323.15 K
Fluid Phase Equilibria ( IF 2.6 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.fluid.2020.112783
Lan Yang , Lele Chen , Tao Zhang , Dan Li , Lingzong Meng , Tianlong Deng , Yafei Guo

Abstract The solubilities and the refractive indices in the ternary system LiBO2−Li2B4O7−H2O at 298.15 K and 323.15 K were determined with the isothermal dissolution method. The phase diagrams and refractive index diagrams were drawn with the experimental values. The phase diagrams at 298.15 K and 323.15 K consist of one invariant point, two univariant curves and two crystallization regions corresponding to Li2B4O7·3H2O, LiBO2·8H2O (at 298.15 K) and LiBO2·2H2O (at 323.15 K). Based on the Pitzer model, the mixing ion-interaction parameters ( θ B ( O H ) 4 − , B 4 O 5 ( OH ) 4 2 − and Ψ L i + , B ( O H ) 4 − , B 4 O 5 ( O H ) 4 2 − ) at 298.15 K and 323.15 K were fitted with the solubility data. A comparison shows that the calculated solubilities in the ternary system at 298.15 and 323.15 K agree well with the experimental data. The phase diagram and Pitzer model for the ternary system were then used to conduct isothermal evaporation simulation. Different salt will be obtained if the original solution point in different unsaturated regions.

中文翻译:

LiBO2-Li2B4O7-H2O 系统在 298.15 K 和 323.15 K 中固液平衡的溶解度测定和热力学建模

摘要 采用等温溶解法测定了LiBO2−Li2B4O7−H2O 在298.15 K 和323.15 K 三元体系中的溶解度和折射率。用实验值绘制相图和折射率图。298.15 K 和 323.15 K 处的相图由一个不变点、两条单变曲线和两个结晶区组成,分别对应于 Li2B4O7·3H2O、LiBO2·8H2O(298.15 K)和 LiBO2·2H2O(323.15 K)。基于 Pitzer 模型,混合离子相互作用参数 ( θ B ( OH ) 4 − , B 4 O 5 ( OH ) 4 2 − 和 Ψ L i + , B ( OH ) 4 − , B 4 O 5 ( OH ) 4 2 - ) 在 298.15 K 和 323.15 K 与溶解度数据拟合。比较表明,计算的三元体系在 298.15 和 323.15 K 的溶解度与实验数据吻合良好。然后使用三元系统的相图和 Pitzer 模型进行等温蒸发模拟。如果原始溶液指向不同的不饱和区域,则会得到不同的盐分。
更新日期:2020-11-01
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