| Investigation of aggregation in solvent extraction of lanthanides by acidic extractants (organo-phosphorus and naphthenic acid) |
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| 作者姓名： | 周乃扶 吴瑾光 俞致健 王笃金 徐光宪 |
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| 作者单位： | State Key Laboratory of Rare Earth Materials Chemistry and Applications，College of Chemistry and Molecular Engineering，Peking University，Beijing 100871，China，State Key Laboratory of Rare Earth Materials Chemistry and Applications，College of Chemistry and Molecular Engineering，Peking University，Beijing 100871，China，State Key Laboratory of Rare Earth Materials Chemistry and Applications，College of Chemistry and Molecular Engineering，Peking University，Beijing 100871，China，State Key Laboratory of Rare Earth Materials Chemistry and Applications，College of Chemistry and Molecular Engineering，Peking University，Beijing 100871，China，State Key Laboratory of Rare Earth Materials Chemistry and Applications，College of Chemistry and Molecular Engineering，Peking University，Beijing 100871，China |
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| 基金项目： | supported by the National Natural Science Foundation of China，the National Climbing Program of China |
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| 摘 要： | Three acidic extractants (Ⅰ) di(2-ethylhexyl) phosphoric acid (HDEHP),(Ⅱ) 2-ethylhexyl phos-phonic acid mono-2-ethylhexyl ester (KEHPEHE) and (Ⅲ) naphthenic acid were employed in preparing the samples for the characterization of the coordination structure of lanthanlde-extractant complexes and the physicochemical nature of aggregates formed in the organic diluent of the solvent extraction systems.Photo correlation spectroscopy (PCS) re-suits on the aggregates formed by the partially saponified HDEHP in n -heptane showed that the hydrodynamic radius of the aggregates was comparable to the molecular dimensions of HDEHP.The addition of 2-octanol into the diluent,by which the mixed solvent was formed,increased the dimensions of the corresponding aggregates.Aggregates formed from the ianthamde ions and HDEHP in the organic phase of the extraction systems were found very unstable.In the case of naphthenic acid,PCS data showed the formation of w/o microemulsion from the saponified naphthenic acid in the mix
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| 收稿时间： | 20 June 1996 |
Investigation of aggregation in solvent extraction of lanthanides by acidic extractants (organophosphorus and naphthenic acid) |
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| Naifu Zhou,Jinguang Wu,Zhijian Yu,R. D. Neuman,Dujin Wang,Guangxian Xu.Investigation of aggregation in solvent extraction of lanthanides by acidic extractants (organo-phosphorus and naphthenic acid)[J].Science in China(Chemistry),1997,40(1):61-71. |
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| Authors: | Naifu Zhou Jinguang Wu Zhijian Yu R D Neuman Dujin Wang Guangxian Xu |
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| Institution: | (1) State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering Peking University, 100871 Beijing, China;(2) Department of Chemical Engineering, Auburn University, 36849 Auburn, AL, USA;(3) Present address: Geological Survey of Alabama, P.O. Box O, 35486-9780 Tuscaloosa, AL, USA;(4) Department of Chemical Engineering, Auburn University, 36849 Auburn, AL, USA;(5) Present address: Nycomed Salutar, 428 Oakmead Parkway, 94086 Sunnyvale, CA, USA;(6) Department of Chemical Engineering, Auburn University, 36849 Auburn, AL, USA |
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| Abstract: | Three acidic extractants (I) di(2-ethylhexyl) phosphoric acid (HDEHP), (II) 2-ethylhexyl phosphonic acid mono-2-ethylhexyl
ester (HEHPEHE) and (III) naphthenic acid were employed in preparing the samples for the characterization of the coordination
structure of lanthanide-extractant complexes and the physicochemica nature of aggregates formed in the organic diluent of
the solvent extraction systems. Photo correlation spectroscopy (PCS) results on the aggregates formed by the partially saponified
HDEHP in n-heptane showed that the hydrodynamic radius of the aggregates was comparable to the molecular dimensions of HDEHP.
The addition of 2-octanol into the diluent, by which the mixed solvent was formed, increased the dimensions of the corresponding
aggregates. Aggregates formed from the lanthanide ions and HDEHP in the organic phase of the extraction systems were found
very unstable. In the case of naphthenic acid, PCS data showed the formation of w/o microemulsion from the saponified naphthenic
acid in the mixed solvent. The extraction of lanthanides by the saponified naphthenic acid in the mixed solvent under the
given experimental conditions was a process of destruction of the w/o microemulsion. A possible mechanism of the breakdown
of the w/o microemulsion droplets is discussed.
Project supported by the National Natural Science Foundation of China and the National Climbing Program of China. |
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| Keywords: | lanthanide acidic extractant extracted complex aggregate |
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