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Composite catalyst for epoxy ring opening as well as preparation method and application of composite catalyst

A composite catalyst and epoxy ring-opening technology, which is applied in the field of catalyst preparation, can solve problems such as poor applicability, inability to produce block products, and safety issues, and achieve the effects of narrow distribution, low degree of unsaturation, and simple preparation methods

Active Publication Date: 2022-03-25
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of process has poor applicability to the original polyether industrialization equipment, requires a lot of technical transformation, and has safety problems caused by excessive small molecules
In addition, block products cannot be produced

Method used

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  • Composite catalyst for epoxy ring opening as well as preparation method and application of composite catalyst
  • Composite catalyst for epoxy ring opening as well as preparation method and application of composite catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Disperse 100 parts of calcium acetate and 1 part of DMC catalyst (particle size 5um) in a 1:1 mixture of tert-butanol and water, add the liquid level to 40% of the reaction kettle, and carry out hydrothermal reaction at 100°C. After 24 hours, add the reacted dispersion liquid to ethylene glycol monomethyl ether which is 3 times the volume of the reaction liquid and filter to obtain the crude product. The crude product is calcined at a high temperature at 400° C. for 4 h; the calcined catalyst is ball milled and controlled The average particle diameter of the catalyst is 50um, and a composite catalyst is obtained.

Embodiment 2

[0032] Disperse 10 parts of barium hydroxide and 1 part of DMC catalyst (particle size 500um) in a 1:1 mixture of tert-butanol and water, add the liquid level to 60% of the reaction kettle, and carry out hydrothermal reaction at 120°C. After reacting for 18 hours, add the reacted dispersion liquid to diethylene glycol monomethyl ether 5 times the volume of the reaction liquid and filter to obtain the crude product. The crude product is calcined at a high temperature at 250°C for 6 hours; the calcined catalyst is ball milled , the average particle size of the catalyst is controlled to 1500um to obtain a composite catalyst.

Embodiment 3

[0034] Disperse 50 parts of magnesium sulfate and 1 part of DMC catalyst (particle size 50um) in a 1:1 mixture of tert-butanol and water, add the liquid level to 80% of the reaction kettle, and carry out hydrothermal reaction at 100°C. After 12 hours, add the reacted dispersion liquid to propylene glycol monomethyl ether which is 7 times the volume of the reaction liquid and filter to obtain the crude product. The crude product is calcined at a high temperature at 400°C for 8 hours; the calcined catalyst is ball milled to control the average The particle size is 200um, and a composite catalyst is obtained.

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Abstract

The invention discloses a composite catalyst for epoxy ring opening and a preparation method thereof, an alkaline earth metal catalyst and a DMC catalyst are subjected to a hydrothermal reaction to obtain the catalyst with a composite structure, and the particle size of the catalyst is 50-1500nm. The novel catalyst can directly catalyze the reaction of small molecules and epoxide, has the characteristics of good catalytic activity, low degree of unsaturation of the prepared product and narrow distribution, can be used for synthesis of polyether, and can also be used for other reactions for preparing compounds through epoxy ring opening.

Description

technical field [0001] The invention relates to a composite catalyst for epoxy ring opening and a preparation method thereof, belonging to the field of catalyst preparation. Background technique [0002] The ring-opening reaction of epoxides is an important class of reactions, especially for the preparation of polyether polyols. The catalysts currently used for ring opening of epoxides are mainly acid catalysts, alkali metal catalysts, alkaline earth metal catalysts, double metal cyanide catalysts (DMC), phosphazene catalysts, and the like. [0003] The use of acidic catalysts generally produces products with small molecular weight and more impurities; the cost of phosphazene catalysts is relatively high; and alkaline earth catalysts have the problem of low activity. At present, alkali metal catalysts and bimetallic catalysts are the most commonly used in industrialization, but there are also problems such as high unsaturation of alkali metal catalyzed products, and bimetal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28
CPCC08G65/2651C08G65/2663C08G65/2609
Inventor 秦承群丛鑫张鹏飞李传亮殷玲陆国太张永振黎源华卫琦
Owner WANHUA CHEM GRP CO LTD