Microwave-assisted Synthesis of Phosphine-Functionailzed Ionic Liquids and Investigation on the Extraction of Rare Earth

doi:10.3724/SP.J.1095.2014.30371

Chinese Journal of Applied Chemistry

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Microwave-assisted Synthesis of Phosphine-Functionailzed Ionic Liquids and Investigation on the Extraction of Rare Earth

ZHU Taofeng, GUO Miao, WANG Sui, JIANG Jun, HU Kewei, ZHAO Lingling, LIANG Hongze^*

(Faculty of Materials Science and Chemical Engineering,Ningbo University,Ningbo 315211,China)

Received:2013-07-22 Revised:2013-09-22 Published:2014-05-10 Online:2014-05-10

Abstract

Abstract: Five phosphine-functionalized ionic liquids, 1-propyl-3-[3-(diphenylphosphinyl)propyl]imidazolium bis(trifluoromethylsulfonyl)amide([PImC3P(O)Ph2][Tf2N]), 1-hexyl-3-[3-(diphenylphosphinyl)propyl]imidazolium bis(trifluoromethylsulfonyl)amide([HImC3P(O)Ph2][Tf2N]), 1-propyl-3-[3-(phenylethoxyphosphinyl)propyl]imidazolium bis(trifluoromethylsulfonyl)amide([PImC3P(O)Ph(OEt)][Tf2N]), 1-hexyl-3-[3-(phenylethoxyphosphinyl)propyl]imidazolium bis(trifluoromethylsulfonyl)amide([HImC3P(O)Ph(OEt)][Tf2N]) and 3-(phenylethoxyphosphinyl)propyltriethylamonium bis(trifluoromethylsulfonyl)amide([TENC3P(O)Ph(OEt)][Tf2N]), were successfully synthesized by microwave-assisted synthesis. All compounds were characterized by 31P NMR, 1H NMR, 13C NMR, HRMS and FT-IR. These ionic liquids were studied as extraction agents for Nd(Ⅲ) ions. The results show that ionic liquids can be used as a single component agent to extract rare earth without the addition of organic diluents and the structure of ionic liquids greatly influences the extraction efficiency. [TENC3P(O)Ph(OEt)][Tf2N] ionic liquid with quaternary ammonium exhibits the best extraction efficiency. The pH value of extraction systems has a significant impact on the extraction efficiency. The highest extraction efficiency is achieved under pH=6.63, while more than 94% of Nd(Ⅲ) can be stripped from the loaded organic phase under pH=1.00.

Key words: microwave-assisted synthesis, ionic liquid, organophosphorus, rare earth, extraction

CLC Number:

O653

ZHU Taofeng, GUO Miao, WANG Sui, JIANG Jun, HU Kewei, ZHAO Lingling, LIANG Hongze*. Microwave-assisted Synthesis of Phosphine-Functionailzed Ionic Liquids and Investigation on the Extraction of Rare Earth[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2014.30371.

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Microwave-assisted Synthesis of Phosphine-Functionailzed Ionic Liquids and Investigation on the Extraction of Rare Earth

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