Solubility of Carbon Dioxide in Aqueous Blends of 2-Amino-2-methyl-1-propanol and <i>N</i>-Methyldiethanolamine

Abstract

Solubility of CO 2 in aqueous solution of 40 mass % MDEA + 5 mass % AMP, 22.5 mass % MDEA + 22.5 mass % AMP, and 10 mass % MDEA + 35 mass % AMP at (313.15, 333.15, and 353.15) K and pressure from vapor pressure of solutions up to 2.5 MPa using isochoric saturation method (or volumetric–gravimetric method) were measured. The results showed that the CO 2 solubility decreases with increasing of temperature and increases with rising of partial pressure of CO 2 and also AMP concentration can improve absorption capacity of MDEA aqueous solution as [AMP] 0 /[MDEA] 0 increases. Deshmukh–Mather model and Peng–Robinson equation of state were used for liquid and vapor phase, respectively, to correlate solubility data.