四元体系LiB5O8 + NaB5O8 + KB5O8 + H2O在298.15 K实验与理论预测相平衡研究

doi:10.11949/0438-1157.20201473

摘要/Abstract

摘要：

采用等温溶解平衡法研究了四元体系LiB₅O₈ + NaB₅O₈ + KB₅O₈ + H₂O在298.15 K下的相平衡。实验测定了该体系在298.15 K下的固液相平衡溶解度和物理性质（密度和折射率），基于实验溶解度绘制了四元体系的干盐相图、水图和物理性质组成图。在该四元体系的干基图中，有一个共饱点（LiB₅O₈·5H₂O + NaB₅O₈·5H₂O + KB₅O₈·4H₂O）、3条单变量溶解度曲线和3个单盐结晶区（LiB₅O₈·5H₂O、NaB₅O₈·5H₂O和KB₅O₈·4H₂O）。该体系在298.15 K下没有复盐和固溶体生成，属于简单四元水溶液体系。结合三元体系溶解度，拟合获得了3种碱金属五硼酸盐的单盐参数和三离子混合作用参数；应用Pitzer及其扩展的HW模型对溶解度进行预测，预测值与实验值吻合较好，表明获得的Pitzer参数可靠。研究结果可为碱金属五硼酸盐分离纯化提供理论基础。

关键词: 水盐体系, 相平衡, Pitzer模型, 碱金属五硼酸盐

Abstract:

The isothermal solution equilibrium method was used to study the phase equilibrium of the quaternary system LiB₅O₈+ NaB₅O₈ + KB₅O₈ + H₂O at 298.15 K. The solid-liquid equilibrium solubility and physical properties (density and refractive index) of the system at 298.15 K were experimentally determined. Based on the experimental solubility, the dry salt phase diagram, water diagram and physical property composition diagram of the quaternary system were drawn. There are one invariant point (LiB₅O₈·5H₂O + NaB₅O₈·5H₂O + KB₅O₈·4H₂O), three univariant isothermal dissolution curves, and three crystallization zones corresponding to LiB₅O₈·5H₂O, NaB₅O₈·5H₂O, and KB₅O₈·4H₂O, respectively. It was found that neither double salt nor sold liquid was formed in this alkalis pentaborate system, and it belongs to the simple quaternary aqueous system. Based on the solubility data of sub-ternary systems, the single salt parameters and three-ion mixing parameters of the three pentaborates were obtained. The predictive solubility obtained by Pitzer and its extended HW model agrees well with the experimental values, indicating that the Pitzer parameters obtained in this work are reliable. The results of this study can provide the basic data of phase equilibria for the separation and purification of alkali-pentaborates.

Key words: salt-water system, phase equilibrium, Pitzer model, alkalis pentaborates

中图分类号:

O 642.4

宋江涛, 袁菲, 余艳, 郭亚飞, 邓天龙. 四元体系LiB₅O₈ + NaB₅O₈ + KB₅O₈ + H₂O在298.15 K实验与理论预测相平衡研究[J]. 化工学报, 2021, 72(6): 3179-3187.

SONG Jiangtao, YUAN Fei, YU Yan, GUO Yafei, DENG Tianlong. Experimental and predictive phase equilibria for the quaternary system LiB₅O₈ + NaB₅O₈ + KB₅O₈ + H₂O at 298.15 K[J]. CIESC Journal, 2021, 72(6): 3179-3187.

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四元体系LiB₅O₈ + NaB₅O₈ + KB₅O₈ + H₂O在298.15 K实验与理论预测相平衡研究

Experimental and predictive phase equilibria for the quaternary system LiB₅O₈ + NaB₅O₈ + KB₅O₈ + H₂O at 298.15 K

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