Abstract
Present study is focused on developing a rigorous thermodynamic model to correlate and predict the vapor-liquid equilibria of CO2 in aqueous blends of DEA / MDEA. Modified Clegg-Pitzer equations have been used to develop the model for (CO2 - MDEA - DEA- H2O) system using the interaction parameters derived from the corresponding ternary systems (CO2 - MDEA - H2O) and (CO2 - DEA - H2O) without any additional parameter. Simulated annealing (SA), a non-traditional algorithm has been used in the numerical part of the model solution. Present work also reports new experimental results for CO2 solubility in (DEA+MDEA+H2O) blend in the temperature range 303 - 323 K, CO2 partial pressure range 1- 100 kPa, and for relative amine compositions 1.5 mass% DEA + 28.5 mass% MDEA, 3 mass% DEA + 27 mass% MDEA, and 4.5 mass% DEA + 25.5 mass% MDEA. The model predictions have been found to be, in general, in good agreement with the literature results as well as experimental results of this work.
