Citric acid and rare earth complex as well as preparation method and application of rare earth catalyst

A rare-earth citric acid and rare-earth catalyst technology, applied in the field of rare-earth catalysts and their preparation, and rare-earth citric acid complexes, to achieve the effects of easy transportation, low price, and wide sources

Active Publication Date: 2014-06-18
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the complexes formed by citric acid and rare earths have not been reported as catalysts for the polymerization of diolefins. The present invention considers the preparation of rare earth complexes of citric acid for the polymerization of diolefins

Method used

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  • Citric acid and rare earth complex as well as preparation method and application of rare earth catalyst
  • Citric acid and rare earth complex as well as preparation method and application of rare earth catalyst
  • Citric acid and rare earth complex as well as preparation method and application of rare earth catalyst

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preparation example Construction

[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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Abstract

The invention provides a citric acid and rare earth complex, a rare earth catalyst as well as a preparation method and an application of the rare earth catalyst. The preparation method of the rare earth catalyst comprises the following steps: mixing citric acid and rare earth complex, alkyl aluminum, first diolefins, alkyl aluminum chloride and a second organic solvent under the condition of inert gas protection and aging so as to obtain the rare earth catalyst. Compared with the existing diolefin catalyst, the preparation method of the rare earth catalyst is simple, avoids dehydration and has no steep demand to the reaction condition; meanwhile, citric acid is a reagent commonly used in chemical industry, so that the rare earth catalyst is wide in source, low in cost, convenient to transport and easy to store.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a rare-earth citrate complex, a rare-earth catalyst and a preparation method and application thereof. Background technique [0002] Citric acid is the largest acid among organic acids, widely distributed in the plant kingdom, such as in lemon, gooseberry, raspberry, grape juice, etc., can be extracted from plant raw materials, and can also be produced by citric acid fermentation of sugar . Citric acid is used as a sequestering agent in food and medicine, and is also a chemical intermediate used in the manufacture of soft drinks, candies, etc. It can also be used as a metal cleaner, mordant, etc. [0003] With the rapid development of the rare earth industry, the application fields of rare earth are becoming wider and wider, and the reports on the synthesis of rare earth compounds are also increasing. These studies have promoted the development of rare earth coordin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F5/00C08F136/08C08F136/06C08F236/06C08F236/08C08F4/54
Inventor 代全权张学全白晨曦毕吉福张春雨张贺新那丽华
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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