Effect of Pulsed DC Applied Voltage on Ionic Liquid Electrospray for Efficient Selective Absorption of Carbon Dioxide

Ionic liquid exhibits outstanding performance for selective absorption of carbon dioxide(CO2). Ionic liquid electrospray for CO2 absorption has been proposed as a high performance CO2 absorption system. CO2 absorption is caused through chemical reactions at gas-liquid interface, thus generating smaller droplets leads to higher absorption efficiency. In this study, the effect of applied pulsed DC voltage on ionic liquid electrospray was experimentally clarified. By applying pulsed DC voltage, smaller droplets are ejected compared to applying continuous DC voltage. Applying pulsed voltage of 50 - 150 Hz increases the number of generated droplets more than twice of that for DC voltage. An improvement of CO2 absorption was clearly obtained when the frequency is in the range of 50 - 150 Hz.