Feasibility of ionic liquids as alternative separation media for industrial solvent extraction processes

Kazunori Nakashima, Fukiko Kubota, Tatsuo Maruyama, Masahiro Goto

Research output: Contribution to journalArticlepeer-review

248 Citations (Scopus)

Abstract

Extraction of rare earth metals into ionic liquids (ILs) from aqueous solutions was investigated using octyl(phenyl)-N,N-diisobutylcarbamoylmethyl phosphine oxide (CMPO) as an extractant. Use of ILs greatly enhanced the extraction efficiency and selectivity of CMPO for metal ions compared to when n-dodecane was used as the extracting solvent. The extraction mechanism has been studied by slope analysis and extraction tests, and these confirmed that the metal extraction proceeds via a cation-exchange mechanism. Furthermore, stripping of metals from ILs into an aqueous phase by complexing agents and recycling of the extracting ILs phase was successfully accomplished.

Original languageEnglish
Pages (from-to)4368-4372
Number of pages5
JournalIndustrial and Engineering Chemistry Research
Volume44
Issue number12
DOIs
Publication statusPublished - 2005 Jun 8

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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