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Chemical Model for Solvent Extraction Equilibrium of Mn(II) by Cyanex 272 from Chloride Solutions
( Nagaphani Kumar Batchu ),( Bo Eun Kim ),( Man Seung Lee ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.6
Solvent extraction equilibrium of manganese(II) using Cyanex 272 dissolved in kerosene was studied from chloride solutions. Distribution ratio data was collected in order to estimate the extraction equilibrium constant. A slope analysis method was used to verify the solvent extraction reaction. The equilibrium constant for the solvent extraction reaction was estimated by taking into account the complex formation reactions between Mn(II) and chloride ion and mass balance equations. The activity coefficients of species in the aqueous phase were estimated by applying the Bromley equation. A comparison was made between the calculated distribution ratios of Mn(II) and the experimentally measured values. Finally, a chemical model was successfully applied for the estimation of the equilibrium constant. (Received October 1, 2013)
( Nagaphani Kumar Batchu ),( Jae Woo Ahn ),( Man Seung Lee ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.11
The equilibrium constant is an important parameter in solvent extraction equilibrium and can be used to represent the extractant capability. The paper describes the application of the equilibrium constant in calculating an extraction isotherm. The solvent extraction of Mn(II) from chloride solutions using a mixture of Cyanex 272 + Cyanex 301 and Cyanex 301+ TBP was studied. Extraction isotherms were obtained using both the mixtures and these isotherms were compared with the calculated isotherms. The calculated isotherms were obtained by utilizing the equilibrium constant for the synergistic mixture. A comparison was made between isotherms obtained experimentally and calculated. (Received February 21, 2013)
Nagaphani Kumar Batchu,전호석,이만승 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.26 No.-
The synergistic solvent extraction of Pr(III) from chloride solutions has been studied using a mixture of Cyanex 301 and LIX 63. Among the various mixtures of extractants screened, this mixture showed significant synergism at a Cyanex 301 mole fraction of 0.8. The effect of various parameters such as equilibrium pH, extractant concentration was studied to identify the extraction reaction on the basis of slope analysis. From stripping studies, dilute sulfuric acid was found to be the best stripping agent. Based on separation factors, the mixture may be applied for the binary separations of Pr and Nd from La.
Man-Seung Lee,Thi Hong Nguyen,Batchu Nagaphani Kumar 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.9
A hydrometallurical process was developed to recover Fe(III), Pd(II), Pt(IV), Rh(III) and Ce(III) from the leach liquor of spent automobile catalysts. Fe(III) was first separated by extraction with tri-butyl-phosphate (TBP). Extraction of the raffinate with tri-isooctylamine (Alamine 308) led to co-extraction of Pd(II) and Pt(IV). They were separately stripped from the loaded Alamine 308 by using a mixture of HCl and thiourea with different concentration. After the recovery of HCl in the raffinate by extraction with tri-2-ethylhexyl amine (TEHA), Rh(III) was recovered by cementation with zinc metal powder. A process flow sheet with the corresponding McCabe-Thiele plots for extraction and stripping was proposed.