Abstract
CO2 solubility in a new solvent based on a blend of N-methyldiethanolamine (MDEA) and Triethylene Tetramine (TETA) was measured between 298 and 393 K for a MDEA concentration ranging from 1400 to 3400 mol•m-3 and a TETA concentration varying from 200 to 400 mol•m-3. At a given TETA concentration, a high increase in the MDEA concentration decreases the CO2 solubility in the solvent. Indeed, an increase in the amine concentration decreases the solubility. However, at a given MDEA concentration, an increase in the TETA concentration leads to a greater CO2 solubility. Affinity with CO2 is dominating compared to the reduction in solubility due to the increase in the TETA concentration. The presence of the TETA increases the CO2 solubility, particularly at low CO2 loading. But, at very low CO2 loadings, experimental uncertainties lead to lower CO2 solubility in the solvents than that obtained for MDEA aqueous solutions, whereas the presence of a very reactive amine with CO2 such as TETA should largely increase the solubility of this gas.