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Cobalt recovery from sulfate solutions was studied by using a liquid membrane containing Cyanex 302. The influence of the pH and the concentrations of cobalt and the extractant on the metal equilibrium distribution was established. Kinetic investigations of the cobalt transfer across a liquid membrane containing Cyanex 302 were performed in a rotating film contactor. Sulfuric acid was used as a stripping agent. The results obtained show that cobalt can be successfully recovered from neutral and weakly acidic sulfate solutions. A mathematical model describing the transport of cobalt ions across the liquid membrane was proposed. The local mass transfer coefficients of cobalt ions in the aqueous phases and cobalt-carrier complex in the organic phase were evaluated on the basis of the experimental data obtained at various conditions as well as on the proposed model.

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This paper presents the design of a pervaporator in order to separate water from an azeotropic mixture, light oil. This mixture is composed of five alcohols ranging from C 2 ±C 5 . From the mass transfer equations obtained from our experimental results, we develop three basic equations governing the pervaporation process formulating mass and energy balance. A very simple heat balance is used considering the vaporization enthalpy of the permeate supplied by the feed mixture under adiabatic conditions. It was clearly seen that the membrane area required to obtain a specific final concentration neglecting the feed temperature drop was underestimated. The membrane surface area is important because the pervaporation modules called stages have higher surface area.