Extraction Equilibrium of Hydrochloric Acid at Low Concentrations between Water and N235 in Isoamyl Alcohol Solution: Experiments and Simulation

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• 作者：Yunzhao Li ; Xingfu Song ; Shuying Sun ; Yanxia Xu ; Jianguo Yu
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2015
• 出版时间：October 8, 2015
• 年：2015
• 卷：60
• 期：10
• 页码：3000-3008
• 全文大小：362K
• ISSN：1520-5134

文摘

N235 in isoamyl alcohol solution acts as an efficient extraction system for the revovery of hydrochloric acid (HCl) at very low concentrations in a coupled reactive extraction鈥揷rystallization process. In this study, the extraction equilibrium of N235 + isoamyl alcohol + HCl + H₂O system was investigated systematically. The formation of the extraction complex in the organic phase was determined by using the experimental data and it was confirmed to be (HCl)₄(R₃N)₄(H₂O)₈. Further, the thermodynamic model was then established by using Pitzer equation to calculate the activities of all the species. The values of the interaction parameters obtained by regression are as follows: 尾_R3N,4:4:8^(org) = 2.8782 and 尾_4:4:8,4:4:8^(org) = 11.4764. The extraction equilibrium constant is ln K_4:4:8 = 38.0274. The thermodynamic model was demonstrated to be reliable and suitable for the N235 + isoamyl alcohol + HCl + H₂O system.