Capture of Co 2 by Vacuum Swing Adsorption Process Using Activated Carbon Beads

Pitch-based AC beads (particle size about 1mm) were synthesized from coal tar pitch through the emulsion method without using binder material in our laboratory. Adsorption equilibrium and adsorption kinetics of CO2 and N2 on the activated carbon beads were studied experimentally and theoretically. Based on the equilibrium and kinetics data, an improved vacuum-pressure swing adsorption (VPSA) process were designed for CO2 capture, and simulations of the VPSA process were performed in gPROMS. Various operating conditions and different process steps were evaluated in order to obtain the high product purity and high CO2 recovery at the expense of the reduced energy consumption.