Experiment and simulation study of CO2 solubility in dimethyl carbonate, 1-octyl-3-methylimidazolium tetrafluoroborate and their mixtures. (15th January 2018)

• Record Type: Journal Article
• Authors: Zhao, Zhijun; Xing, Xiao; Tang, Zhigang; Zheng, Yong; Fei, Weiyang; Liang, Xiangfeng; Ataeivarjovi, E.; Guo, Dong
• Is Part Of: Energy. Volume 143(2018)
• Page Start: 35
• Page End: 42
• Publication Date: 2018-01-15
• Subjects: CO2 capture -- Carbonates -- Ionic liquids -- Physical absorption -- Simulation; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2017.10.116
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: CO2 capture with solvent-based process is known as a promising technology for controlling the global warming. In this work, the constant-volume method was used to investigate CO2 solubility in DMC, ionic liquid of [Omim][BF4 ], and their mixtures from 298.15 to 328.15 K under pressures up to about 3 MPa. The COSMO-RS model was used to predict the Henry's constants and the vapor pressures of DMC in the mixtures. The experimental results showed the CO2 solubility in [Omim][BF4 ] is higher than DMC at 318.15–328.15 K and adding [Omim][BF4 ] into DMC can decrease the viscosity compared to the pure [Omim][BF4 ]. Besides, the COSMO-RS simulation results showed the Henry's constants in the mixtures increases with the decreasing mass ratio of [Omim][BF4 ] which are consistent with experimental values and the vapor pressures of DMC in the mixtures decreases with the increasing mass ratio of [Omim][BF4 ]. Moreover, the activation energy ( Ea ) predicted from viscosity showed the higher viscosity mean the larger Ea and the larger Ea indicate the higher CO2 solubility in these solvents. Finally, the mixtures of DMC and [Omim][BF4 ] may be used as promising physical solvents to capture CO2 with high partial pressures, which combine the advantages of organic solvents and ionic liquids. Highlights: The solubility of CO2 in DMC, [Omim][BF4 ], and their mixtures was investigated. Adding [Omim][BF4 ] into DMC can decrease the vapor pressure of DMC in mixtures. The COSMO-RS model can predict the Henry's constants effectively in this work. The larger Ea indicates the higher CO2 solubility in these solvents.