Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 2, Issue 12, Pages 2758-2764Publisher
AMER CHEMICAL SOC
DOI: 10.1021/sc500493d
Keywords
Ionic liquids; Synergistic extraction; Rare earth elements; Separation; Saponification wastewater
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Funding
- Natural Science and Engineering Research Council of Canada (NSERC)
- SGS Canada, Inc.
- Shell Canada
- Barrick Gold Corp
- COREM
- Teck Resources, Ltd.
- Vale Base Metals
- CheMIQA
- Xstrata Process Support through the Collaborative Research and Development Grant Program [CRDPJ-445682-12]
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A novel form of synergistic extraction using both ionic liquid extractants and a molecular extractant is reported. The molecular extractant (TRPO, a mixture of four trialkylphosphine oxides) and anion precursors of the ionic liquid extractants (HDEHP and HEH[EHP]) are the most commonly used industrial extractants for f-block element separation. Development of acid base coupling bifunctional ionic liquids (ABC-BILs) for rare earth elements (REEs) separation offers a promising strategy to reduce the millions of tons of industrial saponification wastewater that are produced annually. The synergistic effects of the ABC-BILs with TRPO contributed to increased extractabilities and selectivities of middle and heavy lanthanides, revealing theoretical importance and engineering potential in REEs separation.
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