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.