Experimental measurement and modeling study on CO2 equilibrium solubility, density and viscosity for 1-dimethylamino-2-propanol (1DMA2P) solution

Abstract

In this study, new experimental data of CO2 equilibrium solubility for an aqueous solution of 1DMA2P, a novel ternary amine, are presented over a CO2 partial pressure range of 3–168 kPa, at different concentrations of 1DMA2P (2, 3 and 4 M), and in a temperature range of 298.15–333.15 K. Besides, new experimental data of viscosity and density are reported in a concentration range from 20 wt% up to pure 1DMA2P, in a temperature range of 298.15–333.15 K, and in atmospheric pressure. CO2 equilibrium solubility data were predicted by Deshmukh–Mather (D-M) thermodynamic model. From the experimental data of density and viscosity, thermodynamic properties including the thermal expansion coefficient (αp), excess molar volume (VE), viscosity deviation (Δη), activation molar enthalpy (ΔH), activation molar entropy (ΔS), and activation molar Gibbs free energy (ΔG) were obtained. We have modeled and predicted the experimental data of viscosity based on Eyring's theory and nonrandom two-liquid (NRTL) and Wilson models. The results showed that the Eyring-Wilson model predicts the experimental viscosity data better than Eyring-NRTL. For CO2 equilibrium solubility, D-M model gave a good prediction with an absolute average relative deviation of 2.64%.