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CO 2 Solubility in Hybrid Solvents Containing 1- Butyl-3-methylimidazolium tetrafluoroborate and Mixtures of Alkanolamines

Abstract : To reduce the rate of climate change, feasible and energy-efficient solutions need to be found to capture CO2 at low pressure from flue gas emitted by various industries and energy sectors worldwide. The use of solvents to selectively absorb CO2 is a promising option for CO2 capture. This research investigated the solubility of CO2 in hybrid solvents containing the 1-butyl-3-methyl imidazolium tetrafluoroborate [bmim][BF4] ionic liquid with mixtures of up to three alkanolamine solvents, namely monoethanolamine (MEA), diethanolamine (DEA), and methyl-diethanolamine (MDEA). Gravimetric analysis was used to measure equilibrium CO2 solubility in the hybrid solvents containing various compositions of the above components at CO2 partial pressures of 0.05 MPa to 1.5 MPa and temperatures of 303.15 K to 323.15 K. CO2 solubility in these solvents was benchmarked against pure ionic liquids, as well as conventional alkanolamine solvents, and modeled using the Posey−Tapperson−Rochelle model for the alkanolamines present and the SRK equation of state for the ionic liquid present in the hybrid solvents. It was found that the hybrid solvents achieved significantly higher CO2 solubility at low pressure than pure ionic liquids and conventional alkanolamine solvents. Modeling, however, was found to be less accurate for hybrid systems than data modeled for pure ionic liquid systems.
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https://hal-mines-paristech.archives-ouvertes.fr/hal-01199227
Contributor : Marie-Claude Watroba <>
Submitted on : Tuesday, September 15, 2015 - 10:24:07 AM
Last modification on : Friday, April 9, 2021 - 12:02:04 PM
Long-term archiving on: : Tuesday, December 29, 2015 - 7:01:18 AM

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Khalid Osman, Deresh Ramjugernath, Christophe Coquelet. CO 2 Solubility in Hybrid Solvents Containing 1- Butyl-3-methylimidazolium tetrafluoroborate and Mixtures of Alkanolamines. Journal of Chemical and Engineering Data, American Chemical Society, 2015, pp.2380-2391. ⟨10.1021/acs.jced.5b00273⟩. ⟨hal-01199227⟩

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