C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 53/126 (2006.01) B01J 31/04 (2006.01) C07C 51/41 (2006.01) C07C 57/03 (2006.01) C08F 4/52 (2006.01) C08F 36/04 (2006.01)
Patent
CA 2250934
The invention relates to the production of solid, powdery carboxylates of Rare Earth elements, particularly Nd, La, Pr, and Ce, where the ligands coordinated to the metal are preferably long chain, branched carboxylic acids, most preferably 2-ethylhexanoic, neodecanoic (versatic) and naphthenic acids. The process involves batch precipitation under controlled pH and temperature conditions of the product by utilizing Rare Earth water soluble salts, preferably Rare Earth nitrates, and salts of the carboxylic acid and washing the product with water, alcohol, water and alcohol mixtures or combinations thereof.
La présente invention concerne la production carboxylates solides pulvérulents d'éléments de terres rares, en particulier le néodyme (Nd), le lanthane (La), le praséodyme (Pr) et le cérium (Ce), les ligands coordonnés au métal étant de préférence des acides carboxyliques ramifiés à longues chaînes, et tout particulièrement des acides 2-éthylhexanoïque, néodécanoïque (versatique) et naphténique. Le procédé consiste à précipiter dans des conditions contrôlées e pH et de température le produit en utilisant des sels hydrosolubles de terres rares, de préférence des nitrates de terres rares ainsi que des sels de l'acide carboxylique et à laver le produit avec de l'eau, de l'alcool, ou des mélanges ou des combinaisons d'eau et d'alcool.
Gowling Lafleur Henderson Llp
Rhodia Electronics And Catalysis Inc.
Rhodia Inc.
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