Multiphase equilibrium in mixtures of [C4mim] [PF6] with supercritical carbon dioxide, water, and ethanol: applications in catalysis

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Abstract

The ionic liquid [C4mim][PF6] and supercritical carbon dioxide produce multiphase systems when mixed with ethanol and water. Mixtures of these four solvents can be made to go, by small changes in composition, through a succession of phase changes, involving one, two and three-phase situations. Increasing carbon dioxide pressure induces first the appearance of an intermediate liquid phase and later the merging of this phase with the gas, leaving all the ionic liquid in a separate, denser liquid. This succession is suitable to carry out reaction cycles in ionic liquid-based solvents, with complete recovery of the reaction product by CO2 decompression.

Original languageEnglish
Title of host publicationIonic Liquids IIIA: Fundamentals, Progress, Challenges and Opportunities - Properties and Structure
PublisherAmerican Chemical Society (ACS)
Pages301-310
Number of pages10
ISBN (Print)9780841238930
Publication statusPublished - 1 Dec 2005

Publication series

NameACS Symposium Series
PublisherAmerican Chemical Society (ACS)
Volume901
ISSN (Print)0097-6156

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Keywords

  • Ionic liquids
  • Solubility
  • CO2 solubility

Cite this

Najdanovic-Visak, V., Serbanovic, A., Esperança, J. M. S. S., Guedes, H. J. R., Rebelo, L. P. N., & Ponte, M. N. D. (2005). Multiphase equilibrium in mixtures of [C4mim] [PF6] with supercritical carbon dioxide, water, and ethanol: applications in catalysis. In Ionic Liquids IIIA: Fundamentals, Progress, Challenges and Opportunities - Properties and Structure (pp. 301-310). (ACS Symposium Series; Vol. 901). American Chemical Society (ACS).