This work has focused on the study of the kinetics of zinc removal from spent pickling effluents by means
of membrane-assisted solvent extraction (NDSX), as the main step in the valorization process of the metal.
Tributyl phosphate (TBP) and service water were used as extraction (EX) and back-extraction (BEX) agents,
respectively. Working with hollow fiber membrane contactors, kinetic experiments were performed in order
to analyze the influence of operation variables on the rate of zinc separation. A mathematical model that
considers diffusion through the organic membrane as the main kinetic resistance was developed, and the
membrane mass transport coefficient was estimated by means of the parameter estimation tool gEST (from
gPROMS) to obtain a value of K
m = 3.89 × 10-4 m/h. Simulated results agreed satisfactorily with experimental
data, thus confirming the validity of the kinetic model and parameters.
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