1. Preparation of ionic liquids amine hybrid solvents, characterization for CO2 absorption, and kinetic performance.
- Author
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Nawaz Khan, Saleem, Abbas, Faheem, Enujekwu, Francis M., Ullah, Sami, Ali Assiri, Mohammed, and Al-Sehemi, Abdullah G.
- Subjects
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CARBON dioxide adsorption , *SOLVENTS , *CARBON sequestration , *IONIC liquids , *IONIC solutions , *CARBON dioxide , *ABSORPTION , *KINETIC resolution - Abstract
• Thermo-physical characteristics of ILs-amine hybrid solvent were studied for CO 2 capture. • The CO 2 absorption tests were conducted in hybrid media at 30 °C and 2 bar to 50 bar. • The viscosity of the samples does not change over the temperature range from 25 to 70 °C. • The hybrid solvent containing 10 wt% [bmim][TfO] exhibited highest CO 2 absorption kinetics. The thermo-physical characteristics of an ionic liquid-amine hybrid solvent were studied in this work as a result of its potential use in the CO 2 absorption process. The hybrid solvents were developed by mixing 30 wt% MDEA with ionic liquid at different concentrations of 5 wt%, 10 wt%, 15 wt% and 20 wt%. Three imidazolium-based ILs were investigated: 1-butyl-3-methylimidazolium dicyanamide [bmim][DCA], 1-butyl-3-methylimidazolium acetate [bmim][Ac] and 1-butyl-3-methylimidazolium trifluoromethanesulfonate [bmim][TfO. Aqueous ionic liquid-amine hybrid solvent's density, surface tension, refractive index, viscosity and were studied between 25 °C and 70 °C with a regular interval of 5 °C. Whereas the influence of temperature on viscosity is negligible beyond 65 °C and the influence of temperature changed certain physicochemical properties. Furthermore, high-pressure solubility tests were conducted at a fixed temperature of 30 °C to determine the solubility of CO 2 in hybrid media at pressures ranging from 2 bar to 50 bar. The results showed that the CO 2 solubility of the different ionic liquid-amine hybrid systems decreases in the following sequence: [bmim][TfO] + MDEA > [bmim][DCA] + MDEA > [bmim][Ac] + MDEA. It was also found out that the optimum concentration of ionic liquids in the solution is 10 wt%. The kinetics study of the hybrid solvents was studied as a function of concentration, and experimentally determined that 10 wt% [bmim][TfO] exhibited the fast CO 2 absorption kinetics. The kinetics performance study was further conducted as a function of pressure, and the highest absorption rate was recorded at 50 bar as expected. Overall, the addition of ionic liquids was verified to improve the CO 2 absorption and thus it was reported that ionic liquid-amine hybrid solvent is an auspicious solvent for CO 2 removal in the future. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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