Comparison of adsorption capacity of mono-ethanolamine and di-ethanolamine impregnated activated carbon in a multi-staged fluidized bed reactor for carbon-dioxide capture

摘要

The increase of carbon dioxide (CO2) concentration in the atmosphere leads to global warming and climate change. In our present study, a four stage fluidized bed reactor has been designed and developed for removal of CO2. Two different amine impregnated activated carbons have been prepared and used as adsorbents for capture of CO2. By changing the three hydrodynamics factors like gas velocity, solid flow rate and weir height, the highest percentage (%) removal of CO2 has been found out. Sampling and analysis has been performed by using Orsat apparatus. Among the two adsorbents i.e. Monoethanolamine impregnated activated carbon (MEA-AC) and Diethanolamine impregnated activated carbon (DEA-AC), the % removal of CO2 by Monoethanolamine impregnated activated carbon of impregnation ratio 0.6 (MEA-AC(0.6)) shows the highest, due to high degree stability of primary zwitterions formed than secondary zwitterions. Monoethanolamine impregnated activated carbon (MEA-AC) shows the highest % removal of CO2 (95%), at minimum gas velocity (0.188 m/s), maximum solid flow rate (4.12 kg/h) and at maximum weir height (50 mm) at initial concentration of CO2, 3000 ppm. MEA impregnated activated carbon was found to be suitable adsorbent for removal of CO2 from the flue gas in a multistage fluidized bed reactor.