A predictive model, which consists in a set of non-linear mass action and mass balance equations solved by using a taylor-made equation-solving program, is used as a basis to predict experimentally measured distribution coefficients for the Acorga M5640-Exxsol D100–CuSO4–H2SO4 liquid–liquid extraction system at 20°C and aqueous copper concentrations in the range 0.0016–0.0032 mol l−1. The model is also used to obtain the copper loading isotherm at various equilibrium aqueous pH values.
