Acta Phys. -Chim. Sin. ›› 2016, Vol. 32 ›› Issue (3): 605-610.doi: 10.3866/PKU.WHXB201512241

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Physicochemical Properties and CO2 Solubility of Tetrabutylphosphonium Carboxylate Ionic Liquids

Feng-Feng CHEN,Yan DONG,Xiao-Yan SANG,Yan ZHOU*(),Duan-Jian TAO*()   

  • Received:2015-09-11 Published:2016-03-04
  • Contact: Yan ZHOU,Duan-Jian TAO;
  • Supported by:
    the National Natural Science Foundations of China(21206063, 21566011, 31570560);Natural Science Foundations of Jiangxi Provincial Department of Science and Technology, China(20151BAB213016);Sponsored Program for Cultivating Youths of Outstanding Ability in Jiangxi Normal University, China


Four tetrabutylphosphonium carboxylate ionic liquids ([P4444][CA]) were prepared, and their densities, viscosities, refractive indices, and conductivities were measured and correlated with thermodynamic and empirical equations in the temperature range of 298.15-348.15 K. The influence of temperature on these four properties of [P4444][CA] was discussed, and their thermal expansion coefficient values were calculated. The CO2 absorption capacity of [P4444][CA] was studied at 313.15 K and 100 kPa. The results indicated that [P4444][Buty] had the highest CO2 capture capacity among these ionic liquids, with an absorption capacity of 0.4 mol·mol-1 and balance time of less than 5 min.

Key words: Ionic liquid, Tetrabutylphosphonium carboxylate, Physicochemical property, CO2 capture


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