Organic sol comprising at least one oxygenated rare-earth...

C - Chemistry – Metallurgy – 01 – F

Patent

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Details

C01F 17/00 (2006.01) B01J 13/00 (2006.01) B01J 23/10 (2006.01) C01G 3/00 (2006.01) C01G 25/00 (2006.01) C01G 45/00 (2006.01) C01G 49/00 (2006.01) C10L 1/10 (2006.01) C10L 1/30 (2006.01) C10L 10/02 (2006.01) C10L 10/06 (2006.01)

Patent

CA 2235716

A method for processing soot containing one or more rare earths, wherein said soot is contacted with an oxygen-containing gas, is disclosed. The method comprises (a) preparing an aqueous phase comprising a dispersion of at least one oxygenated metal compound; (b) simultaneously or consecutively contacting a suspension from step (a) with an organic phase including at least one amphiphilic agent and preferably an organic mixture or compound as the solvent; and (c) recovering the organic phase. Said oxygenated metal compound is produced by means of a method according to which a solution including at least one soluble rare-earth salt, usually an acetate and/or a chloride, is prepared; the solution is contacted with a basic medium and the resulting reaction mixture is maintained at a basic pH; and the precipitate formed by atomisation or freeze-drying is recovered. Said method is useful in inorganic synthesis and catalysis.

La présente invention a pour objet un procédé de traitement de suies contenant une ou plusieurs terres rares dans lesquelles on met en contact ladite suie avec un gaz contenant de l'oxygène. Ce procédé se définit en ce qu'il comporte les étapes suivantes: (a) préparer une phase aqueuse comportant en dispersion au moins un composé oxygéné métallifère; (b) mettre en contact, simultanément ou consécutivement, une suspension issue de l'étape (a) avec une phase organique comprenant au moins un agent amphiphile et de préférence un composé ou un mélange organique jouant le rôle de solvant; (c) puis récupérer la phase organique; et par le fait que ledit composé oxygéné métallifère est obtenu par un procédé comportant les étapes ci-après: on prépare une solution comprenant au moins un sel soluble, le plus souvent un acétate et/ou un chlorure, de terre rare; on met en contact la solution avec un milieu basique et on maintient le mélange réactionnel ainsi formé à un pH basique; on récupère le précipité formé par atomisation ou lyophilisation. Application à la synthèse minérale et à la catalyse.

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