Kinetics and the difference for extraction of praseodymium and neodymium from nitrate aqueous solution by[A336] [NO<sub>3</sub>] using the single drop technique

Xiaoqin Wang; Kun Huang; Wenjuan Cao; Pan Sun; Weiyuan Song; Huizhou Liu

doi:10.1016/j.cjche.2020.02.010

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Kinetics and the difference for extraction of praseodymium and neodymium from nitrate aqueous solution by[A336] [NO₃] using the single drop technique

Catalysis, Kinetics and Reaction Engineering | Updated：2026-01-06

- Kinetics and the difference for extraction of praseodymium and neodymium from nitrate aqueous solution by[A336] [NO₃] using the single drop technique
- Chinese Journal of Chemical Engineering Vol. 28, Issue 5, Pages: 1326-1333(2020)
- Affiliations：
  
  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing,Beijing,China,100083
  2. CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences,Beijing,China,100190
  3. University of Chinese Academy of Sciences,Beijing,China,100049
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2020.02.010
  CLC：
- Published：2020
- Accepted：
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] using the single drop technique[J]. 中国化学工程学报, 2020, 28(5): 1326-1333.
DOI：

] using the single drop technique[J]. 中国化学工程学报, 2020, 28(5): 1326-1333. DOI： 10.1016/j.cjche.2020.02.010.

摘要

Abstract

The kinetics and the difference for Pr(III) and Nd(III) extraction from nitrate aqueous solution using trialkylmethylammonium nitrate ([A336

]

[NO

]

) as extractant were investigated by the single drop technique. The dependence of the extraction rate of Pr(III) and Nd(III) on the concentrations of free Pr(III) and Nd(III) ions

the concentrations of NaNO

and H

in aqueous solutions

and the concentrations of[A336

]

[NO

]

in kerosene solutions were discussed and the corresponding extraction rate equations for Pr(III) and Nd(III) were obtained. These equations demonstrated that the reaction rate constant of Pr(III) with[A336

]

[NO

]

was double than that of Nd(III). The effect of the addition of diethylenetriaminepentaacetic acid (DTPA) on the difference in the extraction rate of Pr(III) and Nd(III) by[A336

]

[NO

]

was also investigated. It was revealed that the difference in the complex formation rates of Pr(III) and Nd(III) with DTPA made a significant impact on the difference in the extraction rates of Pr(III) and Nd(III) with[A336

]

[NO

]

. The ratio of extraction rates of Pr(III) to Nd(III) with[A336

]

[NO

]

was in proportion to the ratio of complex formation rates of Pr(III) to Nd(III) with DTPA. The extraction rate difference for Pr(III) and Nd(III) with[A336

]

[NO

]

increased due to a higher complex formation rate constant of DTPA with the free and un-complexed Nd(III) ions in the aqueous nitrate solution than that with Pr(III) ions. Therefore

the addition of DTPA in the aqueous nitrate solution is an effective method to intensify the separation of Pr(III) and Nd(III) in kinetics. The study on the extraction mechanism indicated that both the extraction of Pr(III) and Nd(III) by[A336

]

[NO

]

were diffusion controlled

and the reactions obeyed S

2 mechanism. The present work highlights a possible approach to strengthen the kinetic separation of Pr(III) and Nd(III).

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⁰

Kinetics and the difference for extraction of praseodymium and neodymium from nitrate aqueous solution by[A336] [NO3] using the single drop technique

DOI：10.1016/j.cjche.2020.02.010

摘要

Abstract

关键词

Keywords

references

Kinetics and the difference for extraction of praseodymium and neodymium from nitrate aqueous solution by[A336] [NO₃] using the single drop technique