Abstract
The main objective of this study is to investigate the efficiency of 3-(Dimethylamino)-1-propylamine (DMAPA) as a solvent for carbon dioxide (CO2) capture. The solubility of CO2 in aqueous solutions of DMAPA was measured at (313.15 and 333.15) K and at a partial pressure of CO2 up to 275 kPa using the pressure-decay method. Measurements were performed at two concentrations of DMAPA (15 wt % and 30 wt %). DMAPA exhibited high CO2 loading when compared with other benchmark amines for CO2 absorption technology such as mono-ethanolamine (MEA) and piperazine (PZ). In this study, the highest CO2 loading recorded was 1.46 at 313.15 K at a CO2 partial pressure of 271 kPa. The experimental solubility data were correlated with the electrolyte-NRTL model, and the Redlich-Kwong (RK) equation of state was used for the estimation of the vapor phase fugacity coefficients at equilibrium. Excess enthalpy (HE) for DMAPA-water binary system was measured using a C80 flow calorimeter at (313.15 and 333.15) K. Binary NRTL parameters for DMAPA/H2O were regressed from the excess enthalpy (HE) data of the DMAPA-water system; and some other parameters such as the molecule-ion pair parameters, equilibrium constants, etc. were regressed using vapor-liquid equilibrium (VLE) data. Finally, the Gibbs-Helmholtz equation was used to predict the heat of absorption of CO2 solubility in the amine solution based on solubility data.
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