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

Waheed Afzal, Xiangyang Liu, John M Prausnitz

Research output: Contribution to journalArticle

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Abstract

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
Volume404
Early online date2 Jul 2015
DOIs
Publication statusPublished - 25 Oct 2015

Keywords

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

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