The densities and viscosities of
three solutions, namely, two binary
solutions [triethylenetetramine (TETA) + H2O and TETA +
2-amino-2-methyl-1-propanol (AMP)] and one ternary solution (TETA
+ AMP + H2O) were measured at atmospheric pressure and
in the temperature range of 303.15 to 343.15 K. Their viscometric
and volumetric characteristics, such as the excess molar volume (V
E), partial molar volume (V̅
i
), excess partial molar volume (V̅
i
E), partial molar volume at infinite dilution (V̅
i
∞), excess partial molar volume at infinite dilution
(V̅
i
E,∞), apparent molar volume (V
φ.i
), viscosity deviation
(Δη), molar Gibbs free energy (ΔG), molar entropy (ΔS), and molar enthalpy
(ΔH), were calculated to determine the viscous
flows of the solutions, and they could also explain the empirical
results theoretically. The degrees of the decrease in viscosities
and densities of the solutions were different. The variations in the
properties were also analyzed through their intermolecular interactions
and molecular structures. Additionally, Δη and V
E were obtained by the Redlich–Kister
model, for the binary solutions, and the Cibulka model, for the ternary
solution. With the given standard deviations, σ ≤ 3.55,
for the binary solutions, and σ = 3.98, for the ternary solution,
the viscosity data were parameterized by the Eyring–non-random
two-liquid model. The obtained thermodynamic properties were reliable
and could be employed in the design and optimization of a CO2-capture process, utilizing the studied solutions.
