Catalytic and noncatalytic CO2 abs-desorption studies of MEA-TETA-DEEA/MEA-TETA-AMP tri-solvents at specific blended ratios

Abstract

To discover the “coordinative effect” within MEA-polyamines, the non-catalytic CO₂ absorption-desorption tests were conducted within tri-solvents of “MEA-TETA (triethylenetetramine)-DEEA (N, N-diethylethanolamine)/AMP(2-amino-2-methyl-1-propanol)” at specific concentrations of .1 ~ .5 + 2 + 2 mol/L for the first time. The energy efficient combinations were detected of MEA-TETA based tri-solvents with solid acid catalysts, from catalytic CO₂ desorption experiments onto MEA-TETA-DEEA/MEA-TETA-AMP with several commercial solid acid catalysts: blended γ-Al₂O₃/H-ZSM-5 = 2:1, H-mordenite, H-Beta (Hβ), HND-580, and HND-8. Three parameters were adopted to evaluate desorption activity: average desorption rate, heat duty, and desorption factors (DFs). After analyses, the .1 + 2 + 2 mol/L MEA-TETA-AMP with catalyst HND-8 possessed the best CO₂ desorption at 95–98°C with biggest DF. The desorption ability of DEEA was better than AMP, but with aid of solid acid catalyst, the AMP can release more CO₂ than DEEA due to weak stability of AMP-CO₂⁻ carbamate.