Removal of CO₂ in a multistage fluidized bed reactor by diethanol amine impregnated activated carbon

ABSTRACT

To mitigate the emission of carbon dioxide (CO₂), we have developed and designed a four-stage fluidized bed reactor. There is a counter current exchange between solid adsorbent and gas flow. In this present investigation diethanol amine (DEA) impregnated activated carbon made from green coconut shell was used as adsorbent. This type of adsorbent not only adsorbs CO₂ due to the presence of pore but also chemically reacts with CO₂ and form secondary zwitterions. Sampling and analysis of CO₂ was performed using Orsat apparatus. The effect of initial CO₂ concentration, gas velocity, solid rate, weir height etc. on removal efficiency of CO₂ have been investigated and presented. The percentage removal of CO₂ has been found close to 80% under low gas flow rate (0.188 m/s), high solid flow rate (4.12 kg/h) and weir height of 50 mm. From this result it has been found out that multistage fluidized bed reactor may be a suitable equipment for removal of CO₂ from flue gas.

KEYWORDS:

• Activated carbon
• adsorbent
• adsorption
• carbon dioxide capture
• fluidized bed
• multistage