Metal nitrate complexes with tributyl phosphate and with trioctyl phosphine oxide

Nadig, Eugene Warren

doi:10.31274/rtd-180814-2137

Cited by 1 publication

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“…In fact, the extraction of Li (and Mg) by the TBP/FeCl 3 system follows the same principle, but Li + replaces H + in the complex forming [LiL 2 ][FeCl 4 ]. At low acidity, extraction of Fe occurs via the neutral form of [FeCl 3 ·(TBP) 3 ], 39,41 [FeCl 3 ·TOPO], 41 and [FeCl 3 ·(Ph 3 PO) 3 ] 42 (TOPO and Ph 3 PO represent trioctylphosphine oxide and triphenylphosphine oxide, respectively). Besides, the extraction of Fe in the form of [FeCl 2 L 4 ·FeCl 4 ] has been reported for both phosphates and phosphine oxides 43,44 .…”

Section: Resultsmentioning

confidence: 99%

Opposite selectivities of tri‐n‐butyl phosphate and Cyanex 923 in solvent extraction of lithium and magnesium

Binnemans

2021

AIChE Journal

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The synergic solvent extraction system of tri-n-butyl phosphate (TBP) and FeCl 3 (or ionic liquids, ILs) has been extensively studied for selective extraction of Li from Mg-containing brines. However, Cyanex 923 (C923), which extracts many metals stronger than TBP, has not yet been examined for Li/Mg separation. Here, we report on the unexpected observation that the C923/FeCl 3 system has opposite Li/Mg selectivity compared to the TBP/FeCl 3 system. Detailed investigations show that the opposite selectivity of the C923/FeCl 3 (or IL) system is due to three factors: (1) the strong extraction of Fe by C923 leads to a low concentration of [FeCl 4 ] − in the system, which is essential for Li extraction; (2) C923 in combination with an IL extracts Mg strongly by an ion-pair mechanism; (3) most importantly, C923 extracts Mg by solvation, resulting in an insufficient concentration of C923 for Li extraction. The unexpected poor Li/Mg selectivity of C923 highlights the irreplaceable role of TBP in the selective recovery of Li.

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Section: Resultsmentioning

confidence: 99%

Opposite selectivities of tri‐n‐butyl phosphate and Cyanex 923 in solvent extraction of lithium and magnesium

Binnemans

2021

AIChE Journal

View full text Add to dashboard Cite

show abstract

Metal nitrate complexes with tributyl phosphate and with trioctyl phosphine oxide

Cited by 1 publication

References 5 publications

Opposite selectivities of tri‐n‐butyl phosphate and Cyanex 923 in solvent extraction of lithium and magnesium

Opposite selectivities of tri‐n‐butyl phosphate and Cyanex 923 in solvent extraction of lithium and magnesium

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