Crystal Growth Rate of KCl in the KCl–MgCl2–H2O System Based on MSE Modeling
Crystal Growth Rate of KCl in the KCl–MgCl2–H2O System Based on MSE Modeling
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DOI：
10.1021/ie402828s
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发表时间：
2013-11
影响因子：
4.2
通讯作者：
Wenting Cheng-;Qiufang Bo;F. Cheng;Zhiping Du
中科院分区：
文献类型：
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作者：
Wenting Cheng-;Qiufang Bo;F. Cheng;Zhiping Du
基于OLI平台（3.2版）中嵌入的混合溶剂电解质（MSE）模型的过饱和度计算，建立了预测KCl-MgCl2-H2O体系中278.15至323.15 K温度范围内KCl晶体生长速率的动力学模型。 KCl 结晶动力学通过晶体生长速率的表达式来评估，该表达式是 KCl 在过饱和溶液和饱和溶液中化学势差的函数。随后通过新模型探讨了温度（278.15-323.15 K）和过饱和度（0.02-0.08）对KCl-MgCl2-H2O体系中KCl晶体生长速率的影响。结果表明，活化能为99.08 kJ·mol–1的KCl晶体生长速率与温度密切相关，并且在固定过饱和度下，晶体生长速率随着温度的升高而增加。此外，还研究了饱和KCl溶液中冷却和盐析过程中MgCl2浓度对KCl晶体生长速率的影响。
A kinetic model for predicting the crystal growth rate of KCl in the KCl–MgCl2–H2O system over the temperature range of 278.15 to 323.15 K was built based on the supersaturation calculation by the mixed-solvent electrolyte (MSE) model embedded in the OLI platform (version 3.2). The kinetics of KCl crystallization was evaluated by the expression of the crystal growth rate as a function of difference in the chemical potential of KCl in the supersaturated and saturated solutions. The effects of temperature (278.15–323.15 K) and supersaturation (0.02–0.08) on the crystal growth rate of KCl in the KCl–MgCl2–H2O system were subsequently explored by the new model. Results showed that the crystal growth rate of KCl, with the activation energy of 99.08 kJ·mol–1, was strongly temperature-dependent and increased with increasing temperature at a fixed supersaturation. Moreover, the effect of MgCl2 concentration on the crystal growth rate of KCl in saturated KCl solution was also investigated in cooling and salting-ou...