VLE data and modelling of aqueous N,N-diethylethanolamine (DEEA) solutions

This work focuses on N,N-diethylethanolamine (DEEA), a tertiary amine relevant in the phase-change solvents context. Vapour liquid equilibrium data for CO2 loaded aqueous solutions of DEEA are presented. These, along with data for pure DEEA and the binary system H2O-DEEA available in literature, are represented by a model correlating the activity coefficients with the electrolyte non-random two-liquid (eNRTL) model. The model is shown to represent the experimental data well. The equilibrium model allows for simulating the regeneration of the solvent, thereby providing a measurement for the energy demand of the process. Experimental heat of absorption data presented by Kim (2009) are used to validate the predictions of the model.