Predicting \(\hbox {CO}_{2}\) Solubility in Imidazole Ionic Liquids for Use in Absorption Refrigeration Systems by Using the Group Contribution Equation of State Method

  • Wei-Dong WuEmail author
  • Jun Wu
  • Yong Hou
  • Lin Su
  • Hua Zhang


Traditional absorption refrigeration such as \(\hbox {H}_{2}\hbox {O}\)–LiBr- and \(\hbox {NH}_{3}\)\(\hbox {H}_{2}\hbox {O}\)-based refrigeration has limited applications because of several issues, including crystallization, corrosion, and large volume. \(\hbox {CO}_{2}\)–ionic liquids (ILs) as new absorption working pairs were investigated in this study. The objective was to use the group contribution equation of state (GC-EOS) method to predict the solubilities of binary systems containing high-pressure \(\hbox {CO}_{2}\)–imidazole bis(trifluoromethanesulfonimide) ILs and to investigate the applicability and accuracy of the GC-EOS model. The results showed that at pressures up to 11.0 MPa and temperatures of 273 K to 400 K, the \(\hbox {CO}_{2}\) solubility in the ILs increased with increasing system pressure but decreased with increasing temperature, and its variation rate was lower at higher pressures or temperatures. Also, \(\hbox {CO}_{2}\) solubility increased in the order of [emim][\(\hbox {Tf}_{2}\hbox {N}\)] < [bmim][\(\hbox {Tf}_{2}\hbox {N}\)] < [hmim][\(\hbox {Tf}_{2}\hbox {N}\)] < [omim][\(\hbox {Tf}_{2}\hbox {N}\)], indicating that longer alkyl chains of identical IL families resulted in higher \(\hbox {CO}_{2 }\) solubility. The model prediction of \(\hbox {CO}_{2}\) solubility in the four different ILs showed reasonable consistency with the corresponding experimental results from the literature; the largest deviation was 5.7 % for \(\hbox {CO}_{2}\)-[emim][\(\hbox {Tf}_{2}\hbox {N}\)]. Therefore, it can be concluded that the GC-EOS model is a promising theoretical solution that can be used to search for suitable \(\hbox {CO}_{2}\)–IL working pairs for absorption refrigeration systems.


Absorption refrigeration \(\hbox {CO}_{2} \) Group contribution equation of state (GC-EOS) Ionic liquids (ILs) Solubility Working pair 



This work was supported by the National Natural Science Fund of China (No. 51676129), the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry (SRF for ROCS, SEM), and the Natural Science Foundation of Shanghai (No. 14ZR1429000).


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Copyright information

© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  • Wei-Dong Wu
    • 1
    Email author
  • Jun Wu
    • 1
  • Yong Hou
    • 1
    • 2
  • Lin Su
    • 1
  • Hua Zhang
    • 1
  1. 1.School of Energy and Power EngineeringUniversity of Shanghai for Science and TechnologyShanghaiPeople’s Republic of China
  2. 2.Clean Republic SODO LLCSeattleUSA

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