Dry Ionic Liquid (D-IL) never means some “water-free” ionic liquid but is a member of “Dry Matter (DM)”. DM is a collective name for powdery substances that are composed of micro droplets as an inner core phase and surrounding hydrophobic silica nano particles as the shell part. When the core part is water, it is called Dry Water (DW), which is the first member of DM, while D-IL is the newest one. Because of the much larger surface area of DM compared with that of the inner phase in bulk state, this novel substances are expected to show excellent performance for any mass transfer through the gas-liquid interface. In the present study, we investigated CO2 absorption by some D-ILs and a DM containing a polyamine in terms of the speed to the equilibrium and a mol-based absorption efficiency. Compared with the respective bulk systems, the D-IL and DM systems proved to be accelerated by ca.50 times without impairing the absorption efficiency.
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