Supercritical CO2 extraction of molybdenum-ligand complexes from sulfuric solutions

Abstract : The development of environmental-friendly process for strategic metal extraction, limiting organic solvent use and effluent production, appears to be quite a challenging purpose. Production of pure molybdenum using supercritical CO2 extraction process, from sulfuric solution obtained by ore or used catalyst leaching, has been evaluated. Two organic ligands, trioctylamine and 2-ethylhexyl 2-ethylhexylphosphonic acid, were studied to extract Mo as metal complexes solubilized in supercritical CO2. Extraction with trioctylamine revealed to be non-efficient due to a lack of Mo-trioctylamine complex solubility in CO2, even if extraction selectivity of molybdenum versus iron impurity was interesting. On the contrary, extraction with 2-ethylhexyl 2-ethylhexylphosphonic acid leads to high Mo collection efficiency (up to 90% in 7 h). However, no selectivity was observed between molybdenum and zirconium. The selectivity of 2-ethylhexyl 2-ethylhexylphosphonic acid towards molybdenum in presence of iron was better but clearly decreased in presence of zirconium.
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Laurence Hung, Audrey Hertz, Didier Hartmann, Frédéric Charton, Olivier Boutin. Supercritical CO2 extraction of molybdenum-ligand complexes from sulfuric solutions. Journal of Supercritical Fluids, Elsevier, 2016, 111, pp.97-103. ⟨10.1016/j.supflu.2016.01.017⟩. ⟨hal-01297659⟩



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