Ketone functionalized task specific ionic liquids for selective tantalum extraction

Abstract

A novel family of ketone functionalized task specific ionic liquids (TSILs) was designed for the selective extraction of tantalum from sulfuric acid medium. We report the synthesis of functionalized hydrophobic ionic liquids based on piperidium, imidazolium or pyridinium cations bearing ketone moieties and their application in the liquid/liquid extraction of Ta(V). Recovery processes for Ta after extraction were performed and the recyclability of the TSIL was demonstrated. An eco-friendly process based on a TSIL was proposed for the extraction and stripping of tantalum from sulphuric acidic medium. Such system can be used as an alternative to the methyl-iso-butyl ketone (MIBK) which is the most commonly used extractant for the separation and purification of niobium and tantalum by solvent extraction.

Insights into the levulinate-based ionic liquid class: synthesis, cellulose dissolution evaluation and ecotoxicity assessment

“…Ketone functionalized ILs have been recently exploited as alcohol "capture and release" systems with possible fragrance delivery applications, 26 and for selective tantalum extractions. 27 These applications are both striking examples of task specific ionic liquids (TSILs). 28 Recently, we reported the preparation of protic levulinate ILs (Lev PILs) carried out by adding levulinic acid to DBU or DBN, and we tested them as cellulose dissolution and functionalization media.…”

Recovery of tantalum from synthetic sulfuric leach solutions by solvent extraction with phosphonate functionalized ionic liquids

“…TSILs can act as both the organic phase as well as the extracting agent, thus avoiding the difficulties encountered due to extractant/solvent miscibility. Recently, we synthesized a novel family of ketone-functionalized task-specific ionic liquids for the selective extraction of tantalum from sulfuric acid medium (Turgis et al, 2018). This system can serve as an alternative to the MIBK extraction method.…”

Dismantling of Printed Circuit Boards Enabling Electronic Components Sorting and Their Subsequent Treatment Open Improved Elemental Sustainability Opportunities

“…Further purification, by selective extraction of tantalum from an acid leaching solution, has been proposed using ILs instead of an organic solvent in a liquid-liquid extraction process. To emulate the role of the organic solvents used for Ta extraction, such as methyl iso-butyl ketone (MIBK) or tri-butyl phosphate (TBP), ILs were rendered task-specific by functionalizing them with ketone or phosphonate groups, successfully making them selective to tantalum for its extraction from a sulfuric acid leachate [149][150][151].…”