Industrial extractants KELEX

The complexation Co(II) and Ni(II) by 7-(4-ethyl-l-methyloctyl)-8-hydroxyquinoline (HL), the active constituent of the industrial extractant Kelex 100, proceeds through two paths linked through a protonic equilibrium. However, in contrast to the reactions discussed above, in which the kinetically important protonation involves the substituting ligand, the favored mechanism in this case involves metal ion protolysis as in Scheme 3, where for Co and Ni ", respectively, HL = 4.3 X 10 and 1.9 x 10 dm mol s" A hl[H20] = 16 and < 10" s", =... 

In the case of separation of Ni ions, 8-hydroxyquinoline and the industrial extractant Kelex 100 were used in water/SDS/butanol or pentanol/dodecane microemulsions. The kinetic and mechanistic formalisms in the extraction process were worked out by Tondre and coworkers [144,147]. To understand the coupled transport, crown ether or Kelex 100 were used by Derouiche and Tondre [143]. In several instances of metal ion transport, synergistic effects were observed the results were explained on the basis of carrier diffusion in the stagnant layers. 

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See also in sourсe #XX -- [ , , ]

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