首页> 外文期刊>Separation and Purification Technology >Solvent extraction of perrhenate ions with podand-type nitrogen donor ligands
【24h】

Solvent extraction of perrhenate ions with podand-type nitrogen donor ligands

机译:用Podand型氮供体配体溶剂萃取高r酸根离子

获取原文
获取原文并翻译 | 示例
           

摘要

The extraction of perrhenate ion (ReO4~-) with a podand-type nitrogen donor ligand, N,N,N',N'-tetrakis(2-pyridylmethyl)-l,2-ethylenediamine (TPEN), and its analogs were investigated. For the extraction of ReO4~- with TPEN, the distribution ratio of Re increased with increasing the acidity of the aqueous solution in the pH_(eq) range above 3.5 and decreased in the pH_(eq) range below 3.5. These results indicate that ReO4~-is extracted with protonated TPEN in the lower acidic solution; but the extraction of ReO4~- is reduced by the increase in the solubility of multi-protonated TPEN into the highly acidic solution. Two hydrophobic TPEN analogs introducing alkyl groups, N,N,N',N'-tetrakis(2-pyridylmethyl)-dibutylethylenediamine (TPDBEN) and N,N,N'N'-tetrakis[4-(2-butyloxy)-2-pyridylmethyl] ethylenediamine (TBPEN), were synthesized in order to suppress the dissolution of TPEN into acidic solution. The distribution ratios of Re for hydrophobic TPEN analogs increased with increasing the acidity of the aqueous solution even in the pH_(eq) range below 3.5 and achieved two order of magnitude higher than that for TPEN at about pH_(eq) 2.
机译:研究了豆荚型氮供体配体N,N,N',N'-四(2-吡啶甲基)-1,2-乙二胺(TPEN)提取高r酸根离子(ReO4-) 。对于用TPEN萃取ReO4-,在pH_(eq)范围大于3.5的水溶液中,随着水溶液酸度的增加,Re的分配比增大,而在pH_eq范围小于3.5的水溶液中,Re的分配比减小。这些结果表明,ReO4-是在较低的酸性溶液中用质子化的TPEN萃取的。但是通过增加多质子化TPEN在高酸性溶液中的溶解度,减少了ReO4-的萃取。引入烷基的两个疏水性TPEN类似物N,N,N',N'-四(2-吡啶甲基)-二丁基乙二胺(TPDBEN)和N,N,N'N'-四[4-(2-丁氧基)-2为了抑制TPEN在酸性溶液中的溶解,合成了[-吡啶基甲基]乙二胺(TBPEN)。即使在低于3.5的pH_(eq)范围内,疏水性TPEN类似物的Re分配比也随着水溶液酸度的增加而增加,并且比大约pH_(eq)2的TPEN的Re的分配率高出两个数量级。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号