Physical data for a process to separate krypton from air by selective absorption in an ionic liquid

Waheed Afzal, Xiangyang Liu, John M Prausnitz* (Corresponding Author)

*Corresponding author for this work

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Ionic liquids provide a possible absorption process to extract krypton from air. The feed for such a process is an oxygen stream from a liquid-air plant. An effective ionic liquid is [P(14)666][TMPP]; in that solvent, the solubilities of some pertinent common gases are appreciably larger than those in conventional ionic liquids, and the selectivity Kr/O2 is close to 3. A nonvolatile ionic liquid is preferred over a hydrocarbon solvent because of safety and simpler solvent recovery. Because, the viscosity of [P(14)666][TMPP] is very high, 20 wt.% [BHMIM][AC] is added to reduce the viscosity by one order of magnitude without significantly reducing solvent capacity and selectivity. This work provides extensive fundamental data (solubility, density and viscosity) required for process design.
Original languageEnglish
Pages (from-to)124-130
Number of pages7
JournalFluid Phase Equilibria
Early online date2 Jul 2015
Publication statusPublished - 25 Oct 2015

Bibliographical note

This work was supported by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Building Technology, Building Technologies Program of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. The authors are grateful to Robert Hart, Dragan Curcija, Alexis Bell, Scott Lynn and co-workers for valuable advice, and to Maogang He for assistance in preparing the manuscript.


  • Selectivity Kr/O2
  • mixture of ionic liquids
  • separation
  • absorption
  • diluent


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