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

AbstractTo 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.