Phase Equilibrium Study of the AlCl3–CaCl2–H2O System for the Production of Aluminum Chloride Hexahydrate from Ca-Rich Flue Ash

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• 作者：Junfeng Wang ; Camille Petit ; Xiangping Zhang ; Shian Cui
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2016
• 出版时间：January 14, 2016
• 年：2016
• 卷：61
• 期：1
• 页码：359-369
• 全文大小：413K
• ISSN：1520-5134

文摘

The study of the solid–liquid phase equilibrium for the AlCl₃–CaCl₂–H₂O system is of significance to separate aluminum chloride hexahydrate from the leachate obtained by the reaction of Ca-rich fly ash and a waste hydrochloride from chemical plant. The phase equilibrium data for the binary AlCl₃–H₂O system and the ternary AlCl₃–CaCl₂–H₂O system over the temperature range from 278.15 K to 363.15 K were measured. A rigorous and thermodynamically consistent model representing the AlCl₃–CaCl₂–H₂O system developed on the basis of the Pitzer’s activity coefficient model embedded in the Aspen Plus. On the basis of this, the phase behavior of the ternary AlCl₃–CaCl₂–H₂O system at different temperatures was visualized with lucidity on an equilateral triangle. The phase-equilibrium diagram generated by modeling was illustrated to identify the course of crystallization to recover AlCl₃·6H₂O from the solutions containing calcium chloride. All of these will provide a thermodynamic basis for the separation of aluminum chloride from calcium chloride solutions.