In the extraction of aluminum (III) from sodium hydroxide solutions by 7-(5, 5, 7, 7-tetramethyl-1-octen-3-yl)-8-hydroxyquinoline (Kelex 100, designated as HQ hereafter) in kerosene, the distribution equilibria and kinetics have been investigated under different conditions. From the dependence of the distribution coefficient on the concentrations of aqueous sodium hydroxide solution and Kelex 100, it is deduced that the extraction reaction can be expressed as Al (OH)
4-(aq)+3HQ(org)_??_AlQ
3(org)+OH
-(aq)+3H
2O(aq). Besides, the kinetic results under non-equilibrium conditions suggest that aluminium (III) is taken up through either formation of two different activated species, [Al(OH)
3], OH
- or Na
+[Al(OH)
3], OH
-, depending on the concentration of sodium hydroxide in the aqueous phase.
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