A performance comparison study of five single and sixteen blended amine absorbents for CO2 capture using ceramic hollow fiber membrane contactors

Abstract

• A new emerging topic in CO 2 gas separation and chemical engineering was presented. • CO 2 absorption using a hydrophobic modified ceramic hollow fiber membrane contactor. • CO 2 capture performances in twenty-one amine-based absorption systems were examined. • CO 2 capture performance order was MEA ≥ DEA ≥ PZ > AMP > MDEA. • MDEA blended DEA reaches a percentage of increase of CO 2 absorption flux over 500%. The present study has endeavored to establish the relations between the CO 2 absorption properties of five single amine-based absorbents including monoethanolamine (MEA), diethylamine (DEA), N -methyldiethanolamine (MDEA), 2-amino-2-methyl-1-propanol (AMP), and piperazine (PZ), and their sixteen binary mixtures in the blended amine-based absorbents for CO 2 chemical absorption using a hydrophobic modified ceramic hollow fiber membrane contactor (HFMC). Keeping all other variables constant, the CO 2 absorption properties of single and blended amine-based absorbents for CO 2 chemical absorption using hydrophobic modified ceramic HFMCs are highly dependent on their chemical nature and concentration. MEA and DEA have the highest CO 2 absorption flux among the single amine solutions. For the CO 2 absorption in the blended amine-based absorbents, the replacement of MDEA with 20 wt% DEA increased the CO 2 chemical absorption from 1 × 10 4 mol/m 2 s to about 7 × 10 4 mol/m 2 s. Aqueous MDEA blended DEA reaches a percentage of increase of CO 2 absorption flux over 500% in comparison with the corresponding aqueous solution of single MDEA.