CO2 absorption into N-methyldiethanolamine aqueous-organic solvents

The CO2 absorption experiments were significantly influenced by the effect of temperature, amine concentration and water/methanol ratio. The performance of CO2 absorption into aqueous MDEA solutions was compared to that into hybrid MDEA solutions. It was concluded that MDEA aqueous solutions demonstrated lower performance than amine solutions using pure methanol or water-methanol mixtures as solvents, even at high temperatures and amine concentrations. Results showed that at high temperatures, amine concentration and chemical absorption had no relevant influence on the process. The methanol effect was noticed to improve the diffusivity and solubility in the process, by means of physical absorption.