Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

ABSTRACT

tThe mutual diffusion coefficients of aqueous solutions of new polyamine CO2absorbents,namely 3-(methylamino)propylamine, diethylenetriamine, N,N,N ,N -tetramethylethylenediamine, andtetramethyl-1,3-diaminopropane at different concentrations were measured at temperatures from303.15 to 323.15 K using the Taylor dispersion technique. Empirical and semi-theoretical models suchas a modified Snijder et al. equation, UNIDIF equation, and a free-volume relation based on the roughhard-sphere theory were used to represent the experimental diffusion coefficient data as function oftemperature and amine concentration. Densities and viscosities of the aqueous solutions, which wereused in the calculation of diffusion coefficients, were also measured. The obtained density and viscos-ity data were correlated with temperature and amine concentration using a Redlich Kister-type andVogel Tamman Fulcher equation, respectively. The predicted density, viscosity, and diffusion coefficientdata were in reasonable agreement with the experimental data, suggesting that the measured propertieswere satisfactorily represented by the applied models.