文摘
Extraction of copper (II) from aqueous solutions using trifluoro-acetylacetone (TFA) diluted in 1-decanol, MIBK and tetradecane at 298 and 313 K was investigated experimentally and theoretically. Experimental part of the study concerns with the partitioning of copper (II) in both phases at equilibrium. Distribution of copper (II) in aqueous and organic phases was studied to investigate the hypothesis of constant partition coefficient for solvent extraction mass transfer analysis in hollow fiber membrane contactors (HFMCs). Partition coefficient of copper complexant was measured from extraction equilibrium analysis. Hatta number was calculated to define the kinetic regime. In the second part of experimentation, copper (II) extraction with TFA diluted in 1-decanol using hollow fiber membrane contactor closed system was examined based on aforementioned batch extraction kinetics. Previously developed theoretical model [M. Younas, S. Druon-Bocquet, J. Sanchez, Kinetic and dynamic study of liquid¨Cliquid extraction of copper in a HFMC: experimentation, modeling and simulation, AIChE J. 56 (2010) 1469?480] was modified to a more robust single-fiber flow model for mass transfer in non-dispersive solvent extraction in HFMC-based integrated plant. The model was, then, validated with the experimental results for dynamic responses of the solute concentration in reservoir. Experimental results were analysed with various shell side mass transfer correlations. It has been shown, by model simulations that the extent and speed of the extraction depend upon the copper (II) and TFA initial concentration, temperature and physical characteristics of solute and solvents. Likewise flow configuration affects the speed of extraction depending upon the nature of solute and solvent.
