METHOD OF PRODUCING CARBOXYLATES OF RARE-EARTH ELEMENTS Russian patent published in 2010 - IPC C07C51/41 C07C53/126 C07C53/128 C01F17/00 

FIELD: chemistry.

SUBSTANCE: method involves reacting oxides of rare-earth elements (REE) with α, α'-branched monobasic carboxylic acids with 8-20 carbon atoms while stirring at high temperature, as well as their mixtures in the presence of water with molar ratio of water to the rare-earth element equal to 1-3:1, with subsequent cooling, addition of solvent and azeotropic drying of the obtained solutions of carboxylates of rare-earth elements through distillation of the azeotropic solvent-water mixture, where the process is carried out while heating to 100°C and further at a rate of 10°C per hour to 150°C, with removal of the bulk of water during synthesis with a stream of inert gas fed to the bottom of the reactor and bubbled through the reaction mixture, without the stage of elutriation from unreacted oxides of rare-earth elements. The proposed method combines high output and purity of the product with simplification of the technique with minimal loss of reagents and minimal consumption of solvent.

EFFECT: obtaining carboxylates of rare-earth elements which are not prone to oligomerisation during azeotropic drying of their solutions and storage, and catalysts based on said compounds can be prepared with or without cooling and have high activity.

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