
New Trends and Achievements on Solvent Extraction of Copper 67
TABLE 6 Equilibrium data of (CuSO
4
+ lauric acid + benzene) at 298.2K. C
Cu,initial
= 2.5×10
–2
M (1.5886 g/dm
3
) ,
2
4Na SO
C
= 0.1 M (14.204 g/dm
3
).
C
acid
= 0.2 M(40.07 g/dm
3
)C
acid
= 0.5 M(100.17 g/dm
3
)
2
[]10Cu
−
×
(mol/dm
3
)
2
[]10Cu
−
×
(mol/dm
3
)
D
'
%E pH
2
[]10Cu
−
×
(mol/dm
3
)
2
[]10Cu
−
×
(mol/dm
3
)
D
'
%E pH
0.067 2.43 0.03 2.7 3.86 0.205 2.23 0.09 8.2 3.46
0.10 2.40 0.04 4.0 3.88 0.393 2.11 0.19 15.7 3.55
0.132 2.37 0.06 5.3 3.89 0.467 2.03 0.23 18.7 3.58
0.136 2.36 0.06 5.4 3.90 0.629 1.87 0.34 25.2 3.63
0.150 2.35 0.06 6.0 3.91 0.735 1.77 0.42 29.4 3.66
0.199 2.30 0.09 8.0 3.93 0.889 1.61 0.55 35.5 3.70 ...