Kinetics of copper extraction using (anti)-2-hydroxy-5-nonylbenzophenone oxime

Abstract

For reaction 1 using the chelating agent anti-2-hydroxy-5-nonylbenzophenone oxime, the reaction orders for [Cu2+], the active isomer of the oxime, and [H+] were measured experimentally by using a rotating diffusion cell. The reaction orders were first order in [Cu2+], first order in the active isomer of oxime, and negative first order in [H+]. The concentration of copper solution ranged from 1.574 X 10"2 mol/dm3 (1000 ppm) to 1.574 X 10"1 mol/dm3 (10000 ppm), the pH ranged from 3.3 to 4.5, and the purified oxime concentration in decane ranged from 0.05 mol/dm3 to 0.125 mol/dm3. Extrapolation of the diffusion cell data for the kinetically limited case was an important advancement of the technique. The forward and reverse reaction rate constants were calculated; the forward reaction rate constant is 4 X 10-8 m/s, and the reverse reaction rate constant is 2 X 10~n m4/(mol s). These results were obtained using a resistance model of copper transport.

A Mechanistic Study of Uphill Transport of Metal Ions through Countertransport Supported Liquid Membranes

“…Formation reaction of the complex at the feed-membrane interface (13) and in the kinetic studies of Cu2+ extraction with LIX 65N using a rotating diffusion cell (19). In comparison with the present model, however, the nature of carrier (dimeror monomer) and the rate equations (Eqs.…”

“…They are determined to be 4. 19 x m/s and l.% x (mS/ mol.s2)1" at 298 K (16,18). For simplicity, the organic complex VORz(HR) is written as VOR2 hereafter.…”

“…[6][7][8][9][10] are different from those in the former paper (13); moreover, the counterdiffusion of carriers (Eqs. 8 and 9) was not considered in the earlier work (19).…”