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Mechanism of extractant loss in solvent extraction process (Ⅰ)——Transfer of saponified D2EHPA from organic phase to aqueous phase and its aggregation behaviour

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【Author】 WANG Dujin WU Jinguang LI Yan WENG Shifu WU Peiqiang XU Guangxian (State Key Laboratory of Rare Earth Materials Chemistry and Applications,College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China)

【机构】 State Key Laboratory of Rare Earth Materials Chemistry and Applications,College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China；

【摘要】 <正> The phenomenon of the loss of saponified D2EHPA(di(2-ethylhexyl)phosphoric acid,HA)from organic phase to aqueous phase and its aggregation behaviour were studied with FT-IR and DLS(dynamic light scattering)techniques based on the fact that saponified extractant can form reversed micelles orw/o microemulsions in n-heptane,a non-polar diluent.The results indicate that "normal rnioelles" or o/wmicroemulsions are formed from acidic extractant and its sodium salt in aqueous phase,and the micelle ormicroemulsion drop has a non-polar core which can solubilize nheptane,so the equilibrated aqueous phasecontaining extractant is a complex fluid rather than a "real solution".Therefore,the aqueous aggregate for-mation leads to the extractant loss in solvent extraction process.Strong electrolytes can prevent or lessen theextractant loss.The results of this paper provide a theoretical possibility for solving the problem ofextractant and solvent loss in liquid-liquid extraction industry.更多还原

【Abstract】 The phenomenon of the loss of saponified D2EHPA(di(2-ethylhexyl)phosphoric acid,HA) from organic phase to aqueous phase and its aggregation behaviour were studied with FT-IR and DLS (dynamic light scattering)techniques based on the fact that saponified extractant can form reversed micelles or w/o microemulsions in n-heptane,a non-polar diluent.The results indicate that "normal rnioelles" or o/w microemulsions are formed from acidic extractant and its sodium salt in aqueous phase,and the micelle or microemulsion drop has a non-polar core which can solubilize nheptane,so the equilibrated aqueous phase containing extractant is a complex fluid rather than a "real solution".Therefore,the aqueous aggregate for- mation leads to the extractant loss in solvent extraction process.Strong electrolytes can prevent or lessen the extractant loss.The results of this paper provide a theoretical possibility for solving the problem of extractant and solvent loss in liquid-liquid extraction industry.更多还原

【关键词】 D2EHPA； FT-IR； micelle； microemulsion； extractant loss；
【Key words】 D2EHPA； FT-IR； micelle； microemulsion； extractant loss；

【基金】 the National Climbing Program of China

【文献出处】 Science in China(Series B) ,中国科学B辑(英文版) , 编辑部邮箱 ,1995年11期

【分类号】O621.2
【被引频次】5
【下载频次】65

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