Abstract: In order to solve the problem of high temperature(above 100 ℃) desorption of CO₂ captured by traditional process, based on the optimization of CO₂ absorption conditions, a low-temperature and efficient microwave swing regeneration method was proposed. The results showed that when the mass ratio of the N-methyl ethanolamine (MDEA), piperazine (PZ) and 2-(2-aminoethylamino) ethanol (AEEA) was 3:1:5,the CO₂ absorption efficiency of the mixed alcohol amine aqueous solution was the best. At an absorption temperature of 30℃, with the optimized blended alcohol amines as the absorption solution, whenthe mass fraction of the total amines was 20%, the CO₂ absorption capacity of the alcohol amine aqueous solution reached 1.15 mol/mol;the desorption equilibrium could be reached at 95 ℃ for 4 min, the desorption rate of CO₂ was 97.52%, and the desorption of CO₂ was almost complete. Compared with the conventional heating desorption method, the CO₂ desorption ratio of the microwave heating method at 95℃ increased by 62.25 percentage points, the desorption time was significantly shortened, and the high efficiency desorption of CO₂ at low temperature was realized.

Key words: carbon dioxide, capture, blended alcohol amines, microwave heating, desorption