LAUSR

Abstract Enthalpy and vapour-liquid equilibrium (VLE) characteristics of CO 2 absorption in aqueous solution of a new polyamine, bis(3-aminopropyl) amine known as dipropylenetriamine (DPTA) and its aqueous mixture with monoethanolamine (MEA), N-methyldiethanolamine (MDEA), 2-amino-2-methyl-1-propanol (AMP) and potassium carbonate (K 2 CO 3 ) is investigated in this work. The VLE and heat of CO 2 absorption for 30% DPTA is studied in the range of temperature 30–50 °C. In order to analyse the performance of DPTA as additive, mixed amine systems of (5 wt% DPTA + 25 wt% MEA), (5 wt% DPTA + 25 wt% AMP), (5 wt% DPTA + 25 wt% MDEA), (5 wt% DPTA + 25 wt% K 2 CO 3 ) are studied and compared at 40 °C temperature. Density, viscosity and heat capacity of single and mixed amine solvents are also measured in this work. Based on the properties explored in this work, aqueous (DPTA + K 2 CO 3 ) appears to be better solvent compared to the other system studied.