Efficient Extraction of Lithium Ions from High Mg/Li Ratio Brine through the Synergy of TBP and Hydroxyl Functional Ionic Liquids

Abstract

of main observation and conclusion The extraction of Li + from the high Mg/Li ratio brine was performed using hydroxyl functional ionic liquids (ILs) as the coextractant and tributyl phosphate (TBP) as the extractant. Firstly, the extractive system, 1-(2-hydroxyethyl)-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([HOEmim][NTf2]) + TBP was proved to exhibit the highest extraction efficiency of Li + (88.15%) from LiCl aqueous solutions among the extractants composed of different ILs, TBP, and ILs + TBP. Effects of various extraction parameters on the extraction efficiencies of Li + and Mg 2+ were then investigated. 95.01% of Li + was extracted and the Li/Mg separation factor reached 405.76 in a single-stage at 278.15 K and O/A of 2 : 1. The extraction complexes were determined by the slope analysis method and ESI-MS analysis, and the metal complexes in the organic phase were indicated to be mainly [Li•2 TBP][NTf2]. The striping study showed that 92.86% of Li + was stripped with 1.0 mol•L-1 HCl. 98% extraction capacity of the synergy extractants was remained after 5 regeneration cycles. The thermodynamic parameters (ΔG°, ΔH°, and ΔS°), together with the mechanism of the Li + extraction were further demonstrated finally. According to the results, [HOEmim][NTf2] + TBP extraction system showed promising performance in extracting lithium from salt lake brine with high Mg/Li ratio.

Novel Designed PEG‐Dicationic Imidazolium‐Based Ionic Liquids as Effective Plasticizers for Sustainable Polylactide

“…Ionic liquids (ILs) are remarkable chemical compounds, which are found to have wide applications in many areas including creating new polymer materials with unprecedented chemical and physical properties. [ 14‐18 ] Recently, ILs as promising plasticizers for brittle polymer have stimulated intensive research interest because of their highly tunable nature and exceptional properties, including low volatility, nonflammability, high‐temperature stability, etc . [ 19‐20 ] For example, ILs were investigated as “green” and nonvolatile plasticizers for several commercial polymers including polyamide (PA), poly(methyl methacrylate) (PMMA), poly(vinyl chloride) (PVC), etc .…”

Li+ Extraction from Aqueous Medium Using Tetracyanoborate Ionic Liquids─Experiments and ePC-SAFT Modeling

“…However, the selectivity with Cyanex 923/FeCl 3 in their work was disadvantageous, with higher extraction efficiency observed for Mg 2+ rather than Li + . Bai et al 19 The existing literature on modeling and predicting liquid− liquid extraction is presently constrained, despite the paramount importance of having a rapid screening method for various ILs in process development. Moreover, it proves beneficial to possess the capability to model or even predict the impact of process conditions, such as the ( )…”

“…However, the selectivity with Cyanex 923/FeCl 3 in their work was disadvantageous, with higher extraction efficiency observed for Mg 2+ rather than Li + . Bai et al conducted a study utilizing the hydroxyl-functionalized IL 1-hydroxyethyl-3-methyl imidazolium bis­(trifluoromethylsulfonyl)­imide ([hoemim]­[NTf 2 ]) in combination with TBP for Li + extraction. Their investigation yielded an extraction efficiency of 95.01%, and a Li + /Mg 2+ separation factor of 405.76 was achieved.…”

A New Extraction System Based on Isopropyl Salicylate and Trioctylphosphine Oxide for Separating Alkali Metals

“…Crown ethers are not suitable for industrial application as a result of their low efficiency and high cost [ 8 , 9 ]. Systems based on the mixtures of FeCl 3 -TBP are commonly used in the extraction of lithium from brines with extremely high content of magnesium [ 10 , 11 ], but these systems are complex and sensitive to numerous parameters at the stages of extraction, washing, re-extraction, and regeneration [ 12 ]. Moreover, FeCl 3 -TBP-based systems cause corrosion of the equipment and consequently the products require additional treatment (neutralization, removal of admixtures, and sedimentation) [ 13 , 14 ].…”