Solubility of N2O, equilibrium solubility, mass transfer study and modeling of CO2 absorption into aqueous monoethanolamine (MEA)/1-dimethylamino-2-propanol (1DMA2P) solution for post-combustion CO2 capture

In order to establish an integrative mass transfer coefficient (K(G)a(V)) model for CO2 absorption into blended monoethanolamine (MEA)/1-dimethylamino-2-propanol (1DMA2P) solution in packed column, the models of CO2 Henrys law constants (HeCO2-MEA/1DMA2P) and the equilibrium CO2 solubility (alpha(eq)) were constructed. The experimental produced data can be reasonably analyzed. In this work, the Arrhenius equation was employed to fit the values of HeCO2-MEA/1DMA2P at different temperature with AARD of 4.06%; the Kent-Eisenberg prediction model and empirical polynomial prediction model were used to predict the data of alpha(eq) under different CO2 partial pressures and temperatures with AARDs of 2.64% and 0.83%, respectively; the empirical K(G)a(V) model proposed by Li, the empirical K(G)a(V) model proposed by Aroonwilas and new K(G)a(V) model were used to correlate the average values of K(G)a(V) with AARDs of 14.36%, 12.44% and 9.03%, respectively; the model for outlet CO2 concentration (y(CO2,out)) in packed column was developed with AARD of 15.97%. Moreover, the heat of CO2 absorption in 6 kmol/m(3) MEA/1DMA2P solution was estimated by Gibbs-Helmholtz equation which gave a value of -39.8 kJ/mol. The results show that the blended MEA/1DMA2P solution has advantages that make it a potential absorbent for CO2 capture.