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This study presents measured density and viscosity of N-methyldiethanolamine (MDEA) + H2O, Dimethylethanolamine (DMEA) + H2O, and Diethylethanolamine (DEEA) + H2O mixtures. The density was measured at amine mass fraction w1 from 0.3 to 1 for the temperature range 293.15–353.15 K. The excess molar volumes VE were determined from density data. Redlich–Kister type polynomials were proposed to fit VE and density deviation ln(ργ) to represent measured densities. The viscosity was measured at amine mass fraction w1 from 0.3 to 1 for the temperature range 293.15–363.15 K. The viscosity deviation ηE and excess free energy of activation for viscous flow ΔGE* were determined from measured viscosities and examined for intermolecular interactions among mixture molecules. Correlations were proposed to fit viscosity data with acceptable accuracies. The McAllister's three-body model was adopted to fit kinematic viscosities determined from density and dynamic viscosity data. The results showed the importance of examining intermolecular interactions that are discussed in McAllister's four-body model to improve the accuracies of data fits. [ABSTRACT FROM AUTHOR]

Evaluation of measurement uncertainty is vital in the measurement of physicochemical properties. The uncertainty of viscosity measurement of a mixture of monoethanol amine (MEA), water and CO2 is evaluated according to the Guide to the expression of Uncertainty in Measurement (GUM) and validated using Monte Carlo Simulation (MCS) method. This helps to estimate the truncation error due to the first order approximation of Taylor series on nonlinear models in GUM. In literature, only one method is normally used. Calculated uncertainty according to GUM for CO2 loaded aqueous MEA is 0.035 mPa·s. For the uncertainty of viscosity in unloaded aqueous MEA solutions, the confidence interval calculated by GUM deviates from calculated confidence interval according to MCS. This deviation is beyond the numerical tolerance defined for the comparison. The probability distributions of the uncertainty sources influence the distribution of the model output in the MCS method. For the uncertainty of viscosity in CO2 loaded aqueous MEA solutions, the confidence interval calculated by GUM is within the defined numerical tolerance and closer to the calculated confidence interval according to MCS. Combining GUM and MCS will improve confidence in the uncertainty evaluation. [ABSTRACT FROM AUTHOR]

This work presents an experimental study of densities and viscosities of aqueous AMP (2-amino-2-methyl-1-propanol) + MEA (monoethanol amine) + H 2 O solutions with and without CO 2. Amine concentrations were at AMP to MEA mass % ratios of 21/9, 24/6, 27/3 by maintaining 70 mass % of H 2 O. Density measurements were performed in a temperature range from 293.15 K to 343.15 K and viscosity was measured at temperatures from 293.15 K to 363.15 K. The excess molar volume was determined from experimental density data. A Redlich-Kister type polynomial of excess molar volume was adopted to represent the density of unloaded aqueous mixtures. For CO 2 loaded solutions, Setschenow-type correlations and modified Weiland's density and viscosity correlations were used to fit density and viscosity data. Eyring's viscosity model was used to evaluate free energy of activation for viscous flow of mixtures through measured density and viscosity data. The volumetric and viscometric properties of aqueous mixtures were analyzed through the molecular structure and interactions. A correlation was proposed for the free energy of activation of viscous flow to represent viscosity of CO 2 loaded solutions. The results reveal that the proposed correlations for the density and viscosity of mixtures are in good agreement with measured data. • Present measured densities and viscosities of different CO 2 loaded amine mixtures. • Correlations represent measured data with acceptable accuracies. • Weiland's correlations modified for CO 2 loaded aqueous mixtures with two amines. • Eyring's viscosity model adopted to correlate viscosities. [ABSTRACT FROM AUTHOR]