Preparation method and application of citric acid rare earth complex and rare earth catalyst
A rare-earth citric acid and rare-earth catalyst technology, applied in chemical instruments and methods, compounds containing elements of group 3/13 of the periodic table, organic chemistry, etc., to achieve the effects of simple preparation method, easy storage, and low price
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[0027] The present invention also provides a kind of preparation method of rare earth citrate complex, comprising the following steps:
[0028] The citrate rare earth compound and the electron-donating ligand are mixed in the first organic solvent, heated to carry out a reflux reaction, and the citrate rare earth complex is obtained after the first organic solvent is removed.
[0029] Wherein, the present invention has no special limitation on the sources of all raw materials, which can be commercially available or self-made.
[0030] The rare earth citrate compound is preferably prepared according to the following method: mixing the alcoholic aqueous solution of citric acid and the alcoholic aqueous solution of rare earth chloride to obtain a mixed solution, adjusting the pH value of the mixed solution to be alkaline, and filtering to obtain the rare earth citrate compound.
[0031] The invention mixes the alcoholic aqueous solution of citric acid and the alcoholic aqueous so...
Embodiment 1
[0048] 1.1 Dissolve citric acid and neodymium chloride in aqueous ethanol solution with a volume ratio of 1:1, and slowly drop the ethanol aqueous solution of neodymium chloride into the aqueous solution of citric acid and ethanol at a temperature of 50°C, and then drop them into the mixed solution. Add sodium hydroxide solution until the pH value is 4-5, and obtain a large amount of precipitate, filter, wash with absolute ethanol for 2-3 times, and dry to obtain a neodymium citrate compound.
[0049] 1.2 Add the neodymium citrate compound and isooctyl alcohol obtained in 1.1 into the reactor at a molar ratio of 1:3, then add 40ml of tetrahydrofuran as a solvent, condense and reflux for 5 to 24 hours in a boiling state, and evaporate the solvent. and dried to constant weight to obtain the rare earth citrate complex NdC 6 h 5 o 7 ·3(CH 3 ) 2 C(CH 2 ) 5 Oh.
Embodiment 2
[0051] Add the neodymium citrate compound and ethylamine obtained in 1.1 into the reactor at a molar ratio of 1:2, then add 20ml of tetrahydrofuran as a solvent, condense and reflux for 5 to 24 hours in a boiling state, evaporate the solvent, and dry to constant weight, the rare earth complex NdC of citrate was obtained 6 h 5 o 7 ·2CH 3 CH 2 NH 2 .
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