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A kind of supported double metal cyanide catalyst, preparation method and application

A double metal cyanide and catalyst technology, applied in the field of catalytic materials, can solve the problem that the copolymerization product cannot take into account high carbonate unit content, low cyclic carbonate content, and low molecular weight distribution at the same time, so as to promote amorphousness and facilitate separation , Improve the effect of catalytic activity

Active Publication Date: 2017-12-26
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When the above-mentioned double metal cyanide catalyst catalyzes the copolymerization reaction of carbon dioxide and epoxy derivatives, the copolymerization product cannot simultaneously take into account high carbonate unit content, low cyclic carbonate content, high catalytic efficiency and low molecular weight distribution

Method used

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  • A kind of supported double metal cyanide catalyst, preparation method and application
  • A kind of supported double metal cyanide catalyst, preparation method and application
  • A kind of supported double metal cyanide catalyst, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of DMCC-1 Containing Only tert-Butanol Ligand

[0035] (1) Dissolve 1×10-1mol zinc chloride in 100ml deionized water and 20ml tert-butanol mixed solution, stir until zinc chloride is completely dissolved to obtain zinc chloride solution; mix 1×10 -2 mol potassium cobaltcyanide was dissolved in 40ml of deionized water to obtain a potassium cobaltcyanide solution; 15g of PEG4000 was completely dissolved in a mixed solution of 2ml of deionized water and 40ml of tert-butanol at 298K to obtain a PEG solution.

[0036] (2) Add 10 g of Mg-Al LDHs to the zinc chloride solution and keep stirring to obtain a mixed solution I.

[0037] (3) Under the condition of rapid stirring at 333K, slowly add the potassium cobaltcyanide solution into the mixed solution I dropwise, and control the dropping speed at 5-10 seconds / drop. After the dropwise addition, continue to stir, and quickly add the PEG solution , and kept stirring for 1 h to obtain a mixed solution II.

[0038] (4)...

Embodiment 2

[0040] The preparation method of the catalyst is basically the same as in Example 1, except that all the parts of tert-butanol used in Example 1 are replaced with ethanol in equal volume, and the prepared catalyst is marked as DMCC-2.

Embodiment 3

[0042] The preparation method of the catalyst is basically the same as in Example 1, except that all the parts of tert-butanol used in Example 1 are replaced with dimethyl ether (DME) in equal volume, and the prepared catalyst is marked as DMCC-3.

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Abstract

The invention discloses a supported double-metal cyanide catalyst and a preparation method and application thereof. The supported double-metal cyanide catalyst uses hydrotalcite as the supporter, double-metal cyanide is supported on the supporter, and the supported double-metal cyanide catalyst uses polyethylene glycol as the chelating agent. The preparation method includes: using zinc chloride and metal cyanide as precursors, dripping the aqueous solution of central metal into a ligand substance solution for reaction, adding the supporter and the chelating agent at the same time, and performing centrifugal separating and drying to obtain the supported double-metal cyanide catalyst. The invention also provides a preparation method using the supported double-metal cyanide catalyst to prepare carbon dioxide-epoxide copolymer. Compared with same-type catalysts, the supported double-metal cyanide catalyst has the advantages that the catalyst is high in catalyzing activity and good in product selectivity; when the catalyst catalyzes carbon dioxide to have copolymerization reaction with epoxides, the carbonic ester unit content of the copolymerization product is high, the cyclic carbonate content of the copolymerization product is low, and the catalyst is high in actual application value and promising in market prospect.

Description

technical field [0001] The invention belongs to the field of catalytic materials, and in particular relates to a supported double metal cyanide catalyst, a preparation method and a method for preparing polycarbonate by using the catalyst to catalyze the copolymerization reaction of carbon dioxide and epoxy derivatives. Background technique [0002] Carbon dioxide is one of the chief culprits of the greenhouse effect. It accounts for the largest proportion of greenhouse gases and can be used as an abundant carbon and oxygen resource. At present, how to convert carbon dioxide into useful resources has become a research hotspot. Among them, the polycarbonate synthesized by copolymerization of carbon dioxide and epoxy derivatives has a good development prospect. Since its appearance (Polymer Science Polymer Letters, 1969, 7, 287), it has received widespread attention from scientists, and has successively developed a variety of catalytic systems, such as: diethyl zinc / polyproton...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G64/34
CPCC08G64/34
Inventor 许琦周钰韩粉女郁桂云何建玲
Owner YANCHENG INST OF TECH
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