Sorption behavior of zirconium and hafnium on different commercial anion exchange resins with different amine functions; ammonium (Amberjet 4200Cl), pyridine (PVP) and pyridinium (HPQ) was investigated in hydrochloric acid by both batch and column methods. Experiments were studied as a function of the concentration of hydrochloric acid. For all resins, zirconium was preferably extracted. The highest separation factors at equilibrium conditions were obtained by poly(vinyl-pyridine) (PVP) with a hydrochloric acid concentration of 9.5 M. It was observed that a single contact of the loaded resins with pure water completely back extracted the metal ions from the resins. On the basis of the significant difference between distribution coefficients of Zr and Hf, the separation was performed on a glass column (25 Â 160 mm), packed with the resin. The breakthrough curves
This work focuses on the analysis of three types of adsorbents that can be used in hydrogen purification, for the supply of vehicle fuel cells. This technique uses several adsorption columns filled with an adsorbent to obtain continuous operation of the hydrogen production process. Among the three adsorbents tested, the experimental study leads to the choice of Amberlite XAD-4, which gives high adsorption capacity (up to 0.0620 kg Tol • kg XAD -1) with good regeneration properties at low cost. Equilibrium data were fitted to the modified Drachsel isotherm equation. These data provide a useful reference in the design and assessment of the purification process.
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