CO₂ Absorption Using Nanofluids in a Wetted‐Wall Column with External Magnetic Field

Abstract

A new method for enhancing the mass transfer coefficient in the gas absorption process is reported. CO2 absorption experiments were carried out in a wetted‐wall column using different aqueous nanofluids as the solvent. The mass transfer characteristics were found to increase by applying Al2O3/water nanofluid. The mass transfer coefficient decreased with TiO2/water nanofluid. In the case of Fe3O4/water nanofluid, the mass transfer rate was enhanced by increasing the nanoparticle volume fraction, but the mass transfer coefficient was lower than that obtained with water for all experimental conditions studied. Finally, applying a downward magnetic field resulted in higher mass flux and mass transfer coefficient in comparison with experiments without a magnetic field.

Review and Perspectives of CO2 Absorption by Water- and Amine-Based Nanofluids

“…This was because more fresh solvents entered the reactor as the liquid velocity rose to participate in the reaction. Similar results were obtained by Ghasem and Samadi et al, who discovered that, as gas–liquid flow rates rose, mass transfer efficiency did as well. It was discovered that the mass transfer resistance of the liquid phase was more powerful than that of the gas phase, and the positive flow rate effect of the liquid was stronger than that of the gas phase.…”

Experimental Investigation of Mass Transfer Intensification for CO2 Capture by Environment-Friendly Water Based Nanofluid Solvents in a Rotating Packed Bed

“…This result confirms Krishnamurthy et al's and Kim et al's reports [71,85], which demonstrated that an increase in the concentration values of NPs intensifies the diffusion up to a certain value and then decreases. In addition, viscosity does not have a significant effect because of low concentrations, as reported by Samadi [25].…”

Detailed performance model of carbon dioxide absorption utilizing titanium dioxide nanoparticles in a wetted wall column

“…It is observed that at the lowest temperature of 25°C, k l is significantly influenced by raising the liquid flow rate from 100 to 300 mL/min. This is due to the fact that at higher liquid flow rates small and fast moving eddies are formed, resulting in growing CO 2 diffusion into the absorbent . On the other side, the rapid increase in k l with liquid flow rate at low temperatures can be attributed to the liquid phase boundary layer.…”