Korean Journal of Chemical Engineering

The Korean Institute of Chemical Engineers (한국화학공학회)
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Solubility of carbon dioxide in ammonium-based ionic liquids: Butyltrimethylammonium bis(trifluoromethylsulfonyl)imide and methyltrioctylammonium bis(trifluoromethylsulfonyl)imide

  • Nam, Sang Gyu (Department of Chemical Engineering and Nano-Bio Technology, Hannam University) ;
  • Lee, Byung-Chul (Department of Chemical Engineering and Nano-Bio Technology, Hannam University)
  • Received : 2012.08.29
  • Accepted : 2012.10.13
  • Published : 2013.02.01
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Abstract

Solubility results of carbon dioxide ($CO_2$) in two ammonium-based ionic liquids, butyltrimethylammonium bis(trifluoromethylsulfonyl)imide ([N4,1,1,1][$Tf_2N$]) and methyltrioctylammonium bis(trifluoromethylsulfonyl)imide ([N1,8,8,8][$Tf_2N$]), are presented at pressures up to approximately 45 MPa and temperatures ranging from 303.15 K to 343.15 K. The solubility was determined by measuring bubble point pressures of mixtures of $CO_2$ and ionic liquid using a high-pressure equilibrium apparatus equipped with a variable-volume view cell. Sharp increase of equilibrium pressure was observed at high $CO_2$ compositions. The $CO_2$ solubility in ionic liquids increased with the increase of the total length of alkyl chains attached to the ammonium cation of the ionic liquids. The experimental data for the $CO_2$+ionic liquid systems were correlated using the Peng-Robinson equation of state.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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