Table 3. Optimized UNIQUAC and MIDRANGE Binary Interaction Parameters for the Co(II) Chloride Solvent Extraction Model with TOMAC in Toluene at 298 K.
| system | UNIQUAC | MIDRANGEa | MIDRANGE densityb |
|---|---|---|---|
| b0(Cl–,Co2+) = 54.96 | |||
| aqueous phase: | c0(Cl–,Co2+) = −89.56 | ||
| Water | b0(Cl–,CoCl+) = 32.37 | ||
| CoCl2 | c0(Cl–,CoCl+) = 60.02 | ||
| HCl, LiCl | |||
| CaCl2, MgCl2 | b0(Cl–,CoCl42–) = 23.88 | ||
| AlCl3 | c0(Cl–,CoCl42–) = −45.38 | ||
| b0(Cl–,Li+) = 194.0 | d1(H2O,Li+) = 1.95 × 10–3 | ||
| c0(Cl–,Li+) = 10.36 | |||
| b0(Cl–,Al3+) = −902.1 | |||
| c0(Cl–,Al3+) = 1268 | |||
| a(H2O,QCl) = 1.239 × 105 | b0(H2O,QCl) = 30.32 | d1(H2O,QCl) = −6.99 × 10–3 | |
| a(QCl,H2O) = −3239 | c0(H2O,QCl) = 6.506 | d2(H2O,QCl) = −1.54 × 10–2 | |
| d4(H2O,QCl) = −1.54 × 10–6 | |||
| a(HCl,QCl) = −5970 | b0(HCl,QCl) = 7.738 | d1(HCl,QCl) = −0.207 | |
| organic phase: | a(QCl,HCl) = −1.720 × 104 | c0(HCl,QCl) = −114.1 | d2(HCl,QCl) = −0.195 |
| TOMAC (QCl) | |||
| toluene (Tol) | a(Tol,QCl) = 6510 | b0(Tol,QCl) = 23.48 | d1(H2O,Tol) = −3.38 × 10–4 |
| Water | a(Tol,H2O) = −4082 | d2(H2O,Tol) = −3.08 × 10–4 | |
| HCl | |||
| Q2CoCl4 | a(Tol,Q2CoCl4) = 651.4 | d1(HCl,Tol) = 4.51 × 10–3 | |
| a(Q2CoCl4,Tol) = −2492 | d2(HCl,Tol) = 8.08 × 10–3 | ||
| a(H2O,Q2CoCl4) = −664.4 | |||
| a(Q2CoCl4,H2O) = 5.296 × 106 |
a
MIDRANGE ionic strength independent (b) and dependent (c) parameters.19
b
MIDRANGE binary density interaction
parameters in the OLI-MSE framework according to the equation 
.