Solvent Extraction Equilibrium of Zinc from Nitrate Solutions with 2-Ethylhexylphosphonic Acid Mono-2-ethylhexyl Ester

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• 作者：Chaitanya R. Adhikari ; Hirokazu Narita ; Mikiya Tanaka
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：December 19, 2012
• 年：2012
• 卷：51
• 期：50
• 页码：16433-16437
• 全文大小：230K
• 年卷期：v.51,no.50(December 19, 2012)
• ISSN：1520-5045

文摘

The solvent extraction equilibrium of zinc with 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (EHPNA) in an alkane diluent, Shellsol D70, was studied at a constant ionic strength of 1 mol/L from nitrate solutions considering the correction of the extractant nonideality in the organic phase by Alstad鈥檚 method. On the basis of the slope analysis of the obtained data, a molar ratio of 1:2 for the zinc to the EHPNA dimer in the extracted complex was indicated. Apparent extraction equilibrium constants obtained at each temperature from 283 to 323 K showed the endothermic nature of the extraction reaction and gave the apparent standard enthalpy and entropy changes. These two constants enable the calculation of the zinc distribution ratio at each temperature which correlates the experimental data with good accuracy.