Equilibrium solubility and enthalpy of CO2 absorption in aqueous bis(3-aminopropyl) amine and its mixture with MEA, MDEA, AMP and K2CO3

•Enthalpy and solubility of CO2 in aqueous DPTA are measured.•Effect of addition of DPTA in aqueous MEA, MDEA, AMP and K2CO3 is studied.•Mixed amine solvent characteristics is improved due to addition of DPTA.•Density, viscosity and heat capacity of the DPTA based solvents are measured.

Enthalpy and vapour-liquid equilibrium (VLE) characteristics of CO2 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 (K2CO3) is investigated in this work. The VLE and heat of CO2 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% K2CO3) 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 + K2CO3) appears to be better solvent compared to the other system studied.