Temperature Dependent Solid-Liquid Extraction Behavior of Rare Earths Using N-Butyl Pyridinium Hexafluorophosphate with Benzoyl Acetone

Abstract:

Temperature dependent solid-liquid extraction (SLE) behavior of six rare earth elements (REs) was investigated using N-butyl pyridinium hexafluorophosphate ([BPy]PF₆) as an ionic liquid solvent and benzoyl acetone (HA) as an extractant at 80 °C. Parameters including the amount of [BPy]PF₆, HA concentration, extraction time, extraction temperature and pH were investigated and optimized. The extracted species was neutral REA_(n-1)Cl (n-1 = 3 or 2) in the REⁿ⁺-[BPy]PF₆-HA SLE system. The extraction percentage of REⁿ⁺ could be 100% at stated pH and HA concentration. The recovery of REⁿ⁺ extracted into [BPy]PF₆ can be achieved using the mixture of 0.1 mol·L^-1 ClCH₂CO₂H and 0.2 mol·L^-1 HCl as stripping agents. REs were extracted into solid ionic liquid phase with smaller volume and concentrated to some extent. Furthermore the temperature dependent SLE allows to recover [BPy]PF₆ after the extraction procedures. These results indicate that the proposed procedure can be used for the preconcentration and separation of REs using [BPy]PF₆ with high melting point.

• Periodical: Advanced Materials Research (Volumes 734-737)
• Pages: 906-910
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.734-737.906
• Online since: August 2013
• Authors: Zhong Wei Pan, Zi Cheng Cai, Meng Jin Bian, Ting Lian, Zeng Yi Su, Zhen Zhen Zhang, Du Qing Huang
• Keywords: Benzoyl Acetone, Onic Liquid, Rare Earth, Solid-Liquid Extraction

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