Abstract:

Amino acid ionic liquid adsorbs CO₂ rapidly and N-methyldiethanolamine (MDEA)has high CO₂ absorption load.Therefore, tetramethylammonium glycinate (［N₁₁₁₁］［Gly］)was synthesized and mixed with N-methyldiethanolamine (MDEA)aqueous solutions to form complex absorbents.The CO₂ absorption capabilities of the complex absorbents were measured with the constant volume method.The results indicated that the absorption capacity per volume increased with CO₂ pressure and concentration of ［N₁₁₁₁］［Gly］, while the mole absorptivity at absorption equilibrium was independent of ［N₁₁₁₁］［Gly］ concentration under different CO₂ pressures.The absorption of CO₂ was also performed in a countercurrent falling film column, showing that the concentration of ［N₁₁₁₁］［Gly］