Enhancement of Carbon Dioxide Mass Transfer Rate by (Ionic Liquid)-in-Water Emulsion

Abstract

Effects of dispersed ionic liquid (IL) on physical absorption of CO2in aqueous solution were investigated in the study. IL-in-water emulsion had been prepared, whose continuous phase was surfactant aqueous solution, and dispersed phase was an ionic liquid, 1-octyl-3 methyl imidazole hexafluoride phosphate. The morphololgy of dispersion had been observed by visual method. The CO2concentrations in the bulk of the absorption solvent were calculated. Results show that the enhancement of carbon dioxide mass transfer was realized by IL-in-water emulsion. The reason for the increase of CO2mass transfer rates by dispersed ionic liquid has been attributed to the increase of mass transfer driving force depending on shuttle effect.

Ionic Liquids/Deep Eutectic Solvents-Based Hybrid Solvents for CO2 Capture

“…However, some of the ILs (e.g., [P 4442 ][Cy-Suc], 2567 mPa•s at 303.15 K) [8] and DESs (e.g., [MTPP][Br]-GLY 1:4, 1658 mPa•s at 298.15 K) [9] have high viscosities that influence the rate of absorptions, inhibiting their industry applications. To cope with this disadvantage, hybrid ILs or DESs with water have been strongly recommended [9][10][11][12][13][14]. For example, Zhang et (90 wt %) + H 2 O (10 wt %)) [13].…”