Density, Viscosity, and Excess Properties of Ternary Aqueous Mixtures of MDEA + MEA, DMEA + MEA, and DEEA + MEA

Abstract

This study presents the measured densities and viscosities of three ternary aqueous mixtures of tertiary and primary amines. The tertiary amines of n-methyldiethanolamine (MDEA), dimethylethanolamine (DMEA), diethylethanolamine (DEEA), and the primary amine monoethanolamine (MEA) at different concentrations (mass%) were mixed to prepare the liquid mixtures. The excess molar volume VE of the mixtures was analyzed using measured densities to acquire a better understanding of the molecular packing and intermolecular interactions in the mixtures. The excess free energy of activation ∆GE* and excess entropy of activation ∆SE* for viscous flow were determined from the measured viscosities by implementing the theory of rate processes of Eyring. Correlations based on the Redlich–Kister type polynomial were adopted to correlate the excess properties VE and ∆GE* as a function of the amine mole fraction and temperature. The results showed that the correlations were able to represent the measured data with satisfactory accuracies for engineering calculations.

Mixing Functions of Binary Liquid Mixtures of Cyclic Alcohols and Ethylene Glycol at T = 293.15–318.15 K and Pressure P = 0.1 MPa: An Approach from the Volumetric and Viscometric Properties

“…The estimated V m E values were positive for all systems, indicating probably that there is a low intermolecular packing and weak intermolecular interactions between cyclic alcohols and ethylene glycol . Similar behavior has been observed by Tsierkezos and co-workers for ethylene glycol + benzyl alcohol, ethylene glycol + 2-chloroethanol, and ethylene glycol + pentanol-1 mixtures.…”

“…The estimated V m E values were positive for all systems, indicating probably that there is a low intermolecular packing and weak intermolecular interactions between cyclic alcohols and ethylene glycol. 30 Similar behavior has been observed by Tsierkezos and co-workers 31 for ethylene glycol + benzyl alcohol, ethylene glycol + 2-chloroethanol, and ethylene glycol + pentanol-1 mixtures. In addition, the observed positive contributions in V m E is a result of volume expansion on mixing, indicating dispersion type of interactions between the components, due to an incomplete interstitial accommodation of EG in the structural network of cyclic alcohol, due to the difference in molar volume and free volume between components.…”

Understanding the physical and thermodynamic properties of monoethanolamine‐ionic liquids for solvent screening in CO2 capture process

“…Initially, Δ η of solvent mixture exhibits a negative deviation at temperatures <303 K, but later it shows positive sign, which gradually increases with increasing temperatures. Karunarathne et al 46 noticed similar behavior. This progressive increase in viscosity deviations with increasing temperature suggests that the molecules strength diminishes during interactions.…”

“…Simultaneously, increasing the IL content in MEA mixtures increases the surplus molar volume V E , which lowers intermolecular interactions. Furthermore, V E increased as temperature increased 46 . Because the kinetic energy between the molecules increases with temperature, the hydrogen bond between the molecules weakens.…”

“…Furthermore, V E increased as temperature increased. 46 Because the kinetic energy between the molecules increases with temperature, the hydrogen bond between the molecules weakens.…”