Pitzer thermodynamic model of the system HCl-NaCl-CaCl2-H3BO3-H2O at 298.15 K and its application

doi:10.11949/0438-1157.20201696

Abstract

Abstract:

Solubility and refractive index in the ternary system CaCl₂-H₃BO₃-H₂O at 323.15 K were investigated with the dissolution equilibrium method. The phase diagram of this system consists of one invariant point, two univariant solubility curves and two single-salt crystallization regions for CaCl₂·6H₂O and H₃BO₃. The Pitzer parameters containing H₃BO₃ in the quinary system HCl-NaCl-CaCl₂-H₃BO₃-H₂O were fitted with the solubility data of ternary systems in this study and literatures. Combining the dissolution equilibrium constants of the solid phases in the quinary system, the Pitzer model of this system was constructed. The solubility in the quinary system and its subsystems were calculated with the Pitzer model. The phase diagrams and Pitzer model for the quaternary system were used to conduct computer simulation of H₃BO₃separation from brine with NaCl and CaCl₂. The order of salt precipitation and changes in concentration of the brine were obtained. The calculation results show that the separation of H₃BO₃ is easier to achieve under acidic conditions.

Key words: Pitzer thermodynamic model, boric acid, solid and liquid equilibrium, solubility, brine separation

摘要：

采用等温溶解法测定了三元体系CaCl₂-H₃BO₃-H₂O在298.15 K的溶解度和液相的折射率，该三元体系为简单共饱型，有1个共饱点，2条溶解度曲线和2个单盐结晶区，分别为CaCl₂·6H₂O和H₃BO₃。结合本文测定和文献中的溶解度数据，拟合了五元体系HCl-NaCl-CaCl₂-H₃BO₃-H₂O中含H₃BO₃的Pitzer参数，结合固相的溶解平衡常数，构建了该五元体系的Pitzer模型，并计算了该五元体系及其子体系的溶解度。根据Pitzer模型和计算相图，对氯化钠、氯化钙共存卤水中硼酸的分离进行了计算，获得了分离过程中的析盐顺序和卤水组成的变化规律。计算结果表明酸性条件下更容易实现H₃BO₃的分离。

关键词: Pitzer热力学模型, 硼酸, 固液相平衡, 溶解度, 卤水分离

CLC Number:

TQ 028.5

LI Dan, SUN Shuaiqi, ZHANG Tao, ZHAO Yihui, MENG Lingzong, GUO Yafei, DENG Tianlong. Pitzer thermodynamic model of the system HCl-NaCl-CaCl₂-H₃BO₃-H₂O at 298.15 K and its application[J]. CIESC Journal, 2021, 72(6): 3160-3169.

李丹, 孙帅琦, 张涛, 赵一慧, 孟令宗, 郭亚飞, 邓天龙. 五元体系HCl-NaCl-CaCl₂-H₃BO₃-H₂O在298.15 K的Pitzer模型及其应用研究[J]. 化工学报, 2021, 72(6): 3160-3169.

Figures/Tables 1

References 25

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Pitzer thermodynamic model of the system HCl-NaCl-CaCl₂-H₃BO₃-H₂O at 298.15 K and its application

五元体系HCl-NaCl-CaCl₂-H₃BO₃-H₂O在298.15 K的Pitzer模型及其应用研究

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