Abstract:

Monoethanolamine（MEA）aqueous is the most often used absorbent for removing carbon dioxide（CO₂）from fuel gas in industry. Improving the performances of MEA aqueous is one of the key problems for the CO₂ removal. In this paper，the absorption and regeneration performances of MEA，three kinds of tertiary amine aqueous，including N,N-diethylethanolamine ethanol（DEAE），N,N- dimethylethanolamine（DMAE）and N-methyldiethanolamine（MDEA），and the blends of MEA with three tertiary（MEA/tertiary amine）were studied. The results showed that the regeneration capacity of three blends were much better than that of MEA. However，the absorption rate of MEA/tertiary amine was lower than that of MEA. The interaction effects between MEA and tertiary amines during absorption and regeneration process were quite different. The interaction effects depended on the tertiary amine and the type absorption/regeneration time. MDEA had the strongest interaction effect with MEA among theses four tertiary amines. MEA/MDEA is a better absorbent for CO₂ removing.