Ionic liquids and carbon dioxide as combined solvents for reactions and separations: The miscibility switch

E. Kühne, Geert-Jan Witkamp, C. J. Peters*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Ionic liquids (ILs) and carbon dioxide (CO2) are emerging as candidates to replace volatile organic solvents in synthesis and extraction processes. ILs are a relatively new class of substances composed only of ions and liquid at temperatures below 100oC. As a major attractive characteristic, they have negligible vapor pressure - reducing solvent loss by evaporation and environmental pollution. When used simultaneously with carbon dioxide for reactions and extractions, the process will be based on non-toxic, non-flammable solvents and will be applicable for a wide variety of compounds. It has been recently shown that carbon dioxide can be used to split phases in homogenous one-phase systems with ILs. This miscibility switch allows reactions to be carried out in one phase, and by simply changing CO2 pressure, extractions can be carried out more efficiently under heterogeneous conditions. This chapter presents an overview on ionic liquids and carbon dioxide, together with an explanation on the phenomenon of miscibility switch.

Original languageEnglish (US)
Title of host publicationCurrent Trends of Supercritical Fluid Technology in Pharmaceutical, Nutraceutical and Food Processing Industries
PublisherBentham Science Publishers Ltd.
Pages61-70
Number of pages10
ISBN (Print)9781608056613
DOIs
StatePublished - Dec 1 2009

ASJC Scopus subject areas

  • Pharmacology, Toxicology and Pharmaceutics(all)

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