The extraction of copper by an alkylated 8-hydroxy quinoline

Metal complexation at the liquid-liquid interface

“…For this reason, we conducted a detailed study of the kinetics of extraction of Cu(II) with aromatic (e.g., LIX 65N) and aliphatic (e.g., LIX 63) hydroxy oximes, which were introduced in the 1960s by General Mills for the large-scale extraction of cop- Previous workers, pointing to the low aqueous solubility of the LIX reagents, almost intuitively discarded the possibility of chelate formation in the aqueous phase and proposed that interfacial reaction kinetics, rather than homogeneous chemically controlled rates, are dominant. [13][14][15] Thus, in a review of the kinetics and mechanisms of Cu(II) extraction by LIX reagents, Flett16 took the extraordinary position that, because these reagents are "so hydrophobic", their aqueousphase solubility could be totally ignored! Having adopted this view, when chemical parameters appeared in the extraction rate expressions, these investigators invoked an "interfacial reaction" as the rate-determining step.…”

Effect of Hydrophobic Substituent on Solvent Extraction of Copper(II) with 5-Alkyloxymethyl-8-quinolinol or 5-Dialkylaminomethyl-8-quinolinol and Separation of Copper(II)

“…Kelex 100' (7-(1-vinyl-3,3,6,6-tetramethylhexyl)-8-quinolinol) with a hydrophobic substituent at 7-position of 8-quinolinol is chracterized by the large distribution constant (lOs.s) between chloroform and water.2 The origin of the selectivity for copper(II) over iron(III) was ascribed to the difference in the extraction rate at lower pH. 3 Ide et al 4 studied the equilibrium of the liquidliquid extraction of divalent metal ions with sulfonamide extractants having a hydrophobic substituent. They found that copper(II) was extracted with 1,2-bis(octanesulfonamide)benzene at relatively lower pH values by forming the coordinately-unsaturated Cu(L)(H20)2 complex.…”

Liquid membrane processes for gallium recovery from alkaline solutions

“…Kelex 100 (abbreviated as HL) was supplied by Schering Australia. The concentration of the active component, 7-(4-ethyl-l-methyloctyl)-8-quinolinol, was determined as 96% according to the copper loading test of Flett et al (1975). The commercial Kelex 100 was used without further purification.…”