| N, N, N′, N′-四丁基丙二酰胺萃取镧系元素的性能及机理 |
| Extraction Mechanism and Capability of N, N, N′, N′-tetrabutylmalonamide for Lanthanides |
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| 摘要: 研究新型萃取剂从硝酸盐介质中萃取分离稀土元素对于后处理工艺具有重要意义。本文报道以甲苯为稀释剂，N,N,N′,N′-四丁基丙二酰胺(TBMA)从硝酸盐介质中萃取铈(Ⅲ)、镝(Ⅲ)、铒(Ⅲ)、镨(Ⅲ)、钐(Ⅲ)、铽(Ⅲ)、铥(Ⅲ)、镱(Ⅲ)的机理。考察了硝酸浓度、TBMA浓度、盐析剂浓度以及温度对上述三价镧系离子分配比的影响。得出萃合物的组成主要是三配体配合物M(NO3)3·3TBMA；计算出萃取反应的条件平衡常数、萃取平衡常数。温度效应研究表明萃取反应主要是焓驱动的。对萃取分离系数以及TBMA萃取三价镧系离子的规律进行了初步研究。 |
| 关键词: N,N,N′,N′-四丁基丙二酰胺 萃取 镧系元素 |
| 基金项目: |
| Abstract: Extraction mechanism of Ce(Ⅲ), Dy(Ⅲ), Er(Ⅲ), Pu(Ⅲ), Sm(Ⅲ), Tb(Ⅲ), Tm(Ⅲ) and Yb(Ⅲ) from nitrate media with N,N,N,N-tetrabutylmalonamide (TBMA) in toluene was investigated. The effects of the concentration of nitric acid, extractant and salting-out agent were considered. The stoichiometry of the extracted species is M(NO3)3·3TBMA. The extraction conditional equilibrium constant and equilibrium constant were calculated. The thermodynamic parameters determined by the temperature coefficient method indicate that the extraction reactions are predominantly enthalpy stabilized. The extraction separation factor and the extraction rule of trivalent lanthanide ions with TBMA were discussed. |
| Keywords: N,N,N,N-tetrabutylmalonamide extraction trivalent lanthanide |
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| 孙国新,崔 玉,尹少宏,王全勇,徐荣琪.N, N, N′, N′-四丁基丙二酰胺萃取镧系元素的性能及机理[J].无机化学学报,2008,24(2):265-269. |
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