A thermodynamic study of aqueous 1-allyl-3-methylimidazolium formate ionic liquid as a tailored sorbent for carbon dioxide separation

Yujiao Xie, Dilip G. Raut, Rakesh Samikannu, Jyri-Pekka Mikkola, Ji Xiaoyan

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4 Citations (Scopus)


In this work, aqueous 1-allyl-3-methylimidazolium formate ([Amim][HCOO]) was studied as a potential sorbent for CO2 separation. The density and viscosity of aqueous [Amim][HCOO] were measured at temperatures ranging from 293.15 to 333.15 K at atmospheric pressure. The solubility of CO2 and CH4 in dry [Amim][HCOO] as well as the CO2 solubility in aqueous [Amim][HCOO] were measured at pressures up to 1.8 MPa and temperatures of 298.2, 313.2, and 333.2 K. The results showed that the density and viscosity of aqueous [Amim][HCOO] as well as the CO2 solubility in aqueous [Amim][HCOO] decreased upon increasing the water concentration and temperature. The viscosity was very sensitive to the water concentration. The experimental density and viscosity of aqueous [Amim][HCOO] were fitted to semiempirical equations, and the excess molar volume and viscosity deviations were calculated to investigate the interaction between the [Amim][HCOO] ionic liquid and water. The experimental vapor–liquid equilibrium was represented with the nonrandom two-liquid and Redlich–Kwong model. The model parameters can be further implemented into Aspen Plus software to conduct process simulations.

Original languageUndefined/Unknown
Pages (from-to)1464–1471
JournalEnergy Technology
Issue number8
Publication statusPublished - 2017
MoE publication typeA1 Journal article-refereed


  • Chemical Engineering

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