| 摘要 |
FIELD: chemistry of rare-earth elements, chemical technology. ^ SUBSTANCE: invention relates to the improved methods (variants) for preparing salts formed by neodymium and organic acids that are used as components on preparing metal-chelating catalysts. Method for preparing neodymium organic salts from neodymium oxide and carboxylic acid involves conversion of neodymium oxide to a water-soluble salt by heating at temperature 50-150°C with inorganic ammonium salt aqueous solution with simultaneous distillation of water and ammonia. Then carboxylic acid is converted to water-soluble ammonium salt by mixing with distilled ammonia and water. In mixing prepared aqueous solutions of inorganic neodymium salt with organic ammonium salt the neodymium organic salt and inorganic ammonium salt aqueous solution are prepared. After isolation of the end neodymium organic salt an aqueous solution of ammonium inorganic salt is recirculated to the process. Method for preparing neodymium organic salts from neodymium oxide and carboxylic acids (variant) involves conversion of neodymium oxide to water-soluble inorganic salt by heating at temperature 50-150°C with inorganic ammonium salt aqueous solution and with simultaneous distillation of water and ammonia. Then carboxylic acid and hydrocarbon solvent are added to neodymium inorganic salt aqueous solution followed by addition of distilled ammonia at intensive stirring. After ceasing the stirring the reaction mixture if separated for aqueous and organic layers. Aqueous layer representing inorganic ammonium salt solution is recirculated to the process and the end product is isolated from an organic layer representing neodymium organic salt solution in hydrocarbon solvent, or solution of the definite concentration is prepared. Proposed methods (variants) provides excluding consumption of additional reagents and creates conditions for wasteless production of neodymium organic salts from neodymium oxide and organic acids. ^ EFFECT: improved preparing method. ^ 8 cl, 4 ex |
