Ethylammonium nitrate enhances the extraction of transition metal nitrates by tri-n-butyl phosphate (TBP)

被引：8

作者：

Li, Zheng ^{[1
]}

Zhang, Zidan ^{[2
]}

Onghena, Bieke ^{[1
]}

Li, Xiaohua ^{[1
]}

Binnemans, Koen ^{[1
]}

机构：

[1] Katholieke Univ Leuven, Dept Chem, B-3001 Heverlee, Belgium

[2] Univ Texas Austin, Dept Chem Engn, Austin, TX 78712 USA

来源：

AICHE JOURNAL | 2021年 / 67卷 / 07期

基金：

欧洲研究理事会; 欧盟地平线“2020”;

关键词：

ethylammonium nitrate; ionic liquids; solvent extraction; transition metals; tri‐ n‐ butyl phosphate; LIQUID-LIQUID-EXTRACTION; NONAQUEOUS SOLVENT-EXTRACTION; IONIC LIQUID; RARE-EARTHS; ETHYLENE-GLYCOL; CRYSTAL-STRUCTURES; SEPARATION; NICKEL; COBALT; COMPLEXES;

D O I：

10.1002/aic.17213

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Several molecular polar solvents have been used as solvents of the more polar phase in the solvent extraction (SX) of metals. However, the use of hydrophilic ionic liquids (ILs) as solvents has seldomly been explored for this application. Here, the hydrophilic IL ethylammonium nitrate (EAN), has been utilized as a polar solvent in SX of transition metal nitrates by tri-n-butyl phosphate (TBP). It was found that the extraction from EAN is considerably stronger than that from a range of molecular polar solvents. The main species of Co(II) and Fe(III) in EAN are likely [Co(NO3)(4)](2-) and [Fe(NO3)(4)](-), respectively. The extracted species are likely Fe(TBP)(3)(NO3)(3) and a mixture of Co(TBP)(2)(NO3)(2) and Co(TBP)(3)(NO3)(2). The addition of H2O or LiCl to EAN reduces the extraction because the metal cations coordinate to water molecules and chloride ions stronger than to nitrate ions. This study highlights the potential of using hydrophilic ILs to enhance SX of metals.

引用

页数：9

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