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Rare earth compound and preparation method thereof

A technology of rare earth compounds and carboxylic acid compounds, applied in the field of polymerization, can solve the problems of low catalytic efficiency and high impurity content of rare earth catalysts, and achieve the effects of low production cost, low impurity content and high catalytic efficiency

Inactive Publication Date: 2017-04-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects of high impurity content and low catalytic efficiency of rare earth catalysts in the rare earth compounds of the prior art, and provide a preparation method of rare earth compounds and the rare earth compounds prepared by the method

Method used

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  • Rare earth compound and preparation method thereof
  • Rare earth compound and preparation method thereof

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preparation example Construction

[0022] In the second aspect, the present invention provides a method for preparing a rare earth compound, the method comprising: in the presence of an inert solvent, under the condition of dehydration and reflux, contacting a rare earth metal salt with a carboxylic acid compound to obtain a rare earth compound, wherein the The rare earth metal salt is Ln(M) 3 ; M is acetate, nitrate or sulfate; Ln is a lanthanide; the carboxylic acid compound is HR, and R is a carboxylate with 7-12 carbon atoms.

[0023] The above preparation method of the present invention has the advantage of low production cost, and the rare earth catalyst prepared by using the rare earth compound prepared by the above method of the present invention has the advantage of high catalytic efficiency.

[0024] In the present invention, the rare earth metal salt can exist in the form of hydrate. That is to say, the rare earth metal salt described in the present invention includes its hydrate form.

[0025] In ...

Embodiment 1

[0058] This example is used to illustrate the method for preparing rare earth compounds of the present invention. specifically:

[0059] Add 0.01mol of neodymium acetate (Nd(OAc) to 100mL of chlorobenzene 3 ·6H 2 (0) and 0.04mol of neodecanoic acid, and add 5g of Molecular sieves, and then heated to reflux for 7 hours. After the obtained reactant was distilled off under reduced pressure to remove the solvent, an appropriate amount of hexane solvent was added to dissolve it into a rare earth compound solution with a concentration of 0.5 mol / L for use.

Embodiment 2

[0061] This example is used to illustrate the method for preparing rare earth compounds of the present invention. specifically:

[0062] To 100mL of toluene was added 0.01mol of neodymium acetate (Nd(OAc) 3 ·6H 2 O) and 0.05mol of cyclohexyl formic acid, and add 6g of Molecular sieves, and then heated to reflux for 10 hours. After the obtained reactant was distilled off under reduced pressure to remove the solvent, an appropriate amount of cyclohexane solvent was added to dissolve it into a rare earth compound solution with a concentration of 0.5 mol / L for use.

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Abstract

The invention relates to the field of polymerization, and discloses a rare earth compound and a preparation method thereof. The rare earth compound is represented by a formula (1) Ln(R)3.HR, wherein R represents a carboxylate radical having 7 to 12 carbon atoms, and Ln represents lanthanide. The preparation method comprises a step of contacting rare earth metal salts with carboxylic acid compounds in the presence of an inert solvent under the conditions of dehydration and refluxing. The prepared rare earth compound has a low impurity content. Moreover, the cost of production using the rare earth compound to prepare a rare earth catalyst is low, and the catalytic efficiency of the obtained rare earth catalyst is high.

Description

technical field [0001] The invention relates to the field of polymerization, in particular to a rare earth compound, a preparation method of the rare earth compound and the rare earth compound prepared by the method. Background technique [0002] Rare earth catalysts can be used for homopolymerization or copolymerization of conjugated diolefins to synthesize polymers with high cis structure, and the polymers have the characteristics of high linearity, high molecular weight, and low gel content. Synthesis of high-cis polybutadiene and polyisoprene rubber products using neodymium rare earth catalysts has become the focus of industry attention. Catalysts are the key to ensuring process stability, producing high-quality products and controlling production costs. Catalysts with high activity and high selectivity are the common goals pursued by academia and industry. [0003] US2005 / 0137338A1 discloses a neodymium carboxylate / aluminum alkyl / rare earth halogen catalyst, which can ...

Claims

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Application Information

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IPC IPC(8): C08F4/54C08F136/08C08F136/06C07F5/00
Inventor 谭金枚董江舟张杰李传清徐林王雪
Owner CHINA PETROLEUM & CHEM CORP
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