Abstract
In this research, a novel aqueous solvent, i.e., nanoparticle-enhanced ionic liquid (NEIL), is proposed for CO2 capture by mixing of MEA as the base fluid and [Bmim]BF4 ionic liquid and TiO2 nanoparticles as chemical additives. Then, the flow hydrodynamics, mass transfer characteristics, and CO2 absorption performance of the proposed solvent are investigated in a T-shaped microchannel structure by Computational Fluid Dynamics technique at steady-state condition. To present a detailed model, the Navier–Stokes and continuity equations are combined with a two-phase laminar flow module considering mass transfer between heterogeneous phases. Then, the effects of [Bmim]BF4 and TiO2 mass fraction on CO2 loading, bubble formation, and velocity profile are investigated at different gas and liquid holdups at ionic liquid fraction 0 % to 10% and nanoparticle fraction 0 to 0.1%. It concludes that the purification fraction reaches a maximum at TiO2 weight fraction 0.04% and applying solvent with high nanoparticle content decreases purification fraction. In general, the proposed solvent and the considered contactor present adequate performance to absorb CO2 from the gas mixture.
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Abbreviations
- a :
-
Interfacial area (m2)
- c :
-
Concentration (mol·m−3)
- D :
-
Diffusion coefficient (m2·s−1)
- d :
-
Nanoparticle diameter
- E :
-
Enhancement factor
- F :
-
Volume force vector (N·m−3)
- H :
-
Henry’s constant (Pa·m3·mol−1)
- I :
-
Gas–liquid interface
- ILs :
-
Ionic liquids
- k :
-
Reaction rate constant
- k L :
-
Liquid side mass transfer coefficient (m·s−1)
- n :
-
Normal vector
- p :
-
Pressure (Pa)
- R :
-
Total mass transfer rate expression (mol·m−3·s−1)
- Re :
-
Reynolds number
- S :
-
Strain rate tensor
- Sc :
-
Schmitt number
- t :
-
Time (s)
- u :
-
Velocity vector (m·s−1)
- w :
-
Mass fraction
- x :
-
Channel length (m)
- µ :
-
Dynamic viscosity (Pa·s−1)
- γ :
-
Reinitialization parameter (m·s−1)
- ε :
-
Interface controlling parameter (m)
- ϕ :
-
Volume fraction
- φ :
-
Volume concentration of nanoparticle
- τ c :
-
Residence time (s)
- τ f :
-
Viscous stress tensor (Pa)
- ρ :
-
Density (kg·m−3)
- η :
-
Purification fraction
- AMP:
-
Aminomethyl propanol
- DEA:
-
Diethanolamine
- MDEA:
-
Methyl diethanolamine
- MEA:
-
Monoethanolamine
- NEILs:
-
Nanoparticle-Enhanced Ionic liquids
- NPs:
-
Nanoparticles
- [Bmim]BF4 :
-
1-Butyl-3-methylimidazolium tetrafluoroborate
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Makarem, M.A., Kiani, M.R., Farsi, M. et al. CFD Simulation of CO2 Capture in a Microchannel by Aqueous Mixtures of MEA and [Bmim]BF4 Modified with TiO2 Nanoparticles. Int J Thermophys 42, 57 (2021). https://doi.org/10.1007/s10765-021-02812-1
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DOI: https://doi.org/10.1007/s10765-021-02812-1