Crystal Growth Rate of KCl in the KCl鈥揗gCl2鈥揌2O System Based on MSE Modeling

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• 作者：Wenting Cheng ; Qiufang Bo ; Fangqin Cheng ; Zhiping Du
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：December 11, 2013
• 年：2013
• 卷：52
• 期：49
• 页码：17658-17666
• 全文大小：482K
• 年卷期：v.52,no.49(December 11, 2013)
• ISSN：1520-5045

文摘

A kinetic model for predicting the crystal growth rate of KCl in the KCl鈥揗gCl₂鈥揌₂O 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鈥?23.15 K) and supersaturation (0.02鈥?.08) on the crystal growth rate of KCl in the KCl鈥揗gCl₂鈥揌₂O 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路mol^鈥?, 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-out cases. SEM analysis showed that the growth of KCl in KCl鈥揗gCl₂鈥揌₂O system was mainly dominated by the spiral growth mechanism.