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Double metal cyanide catalyst, preparation method and usage thereof

A double metal cyanide and catalyst technology, applied in the direction of physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, chemical instruments and methods, can solve high cost, affect industrial applications, and catalyst manufacturing costs High-level problems, to achieve the effect of reducing dosage and high catalytic efficiency

Inactive Publication Date: 2010-01-13
湖南领湃达志科技股份有限公司
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Yet the above-mentioned catalyst that can be used for carbon dioxide / epoxide copolymerization has all adopted similar synthetic method in the process of preparation, all is to carry out chelation with metal halide and chelating agent first, then gradually add dropwise metal cyanide, metal The amount of halide and chelating agent is far in excess, generally 3-20 times that of metal cyanide. When Shang Chen et al. prepared tert-butanol as a double metal cyanide catalyst with chelating agent, the excess of zinc chloride was about 20 times. Mixture overdose thousands of times
In industrial application, the recovery cost of chelating agent is high. When polymer chelating agent is used, the recovery of chelating agent is not economically cost-effective. The cost of treating these wastewater containing a large amount of chelating agent is very high, and the catalyst manufacturing cost is high, which affects the industrial application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Under stirring conditions, gradually add 50ml of 20% potassium ferricyanide aqueous solution dropwise into 50ml of 10% zinc chloride aqueous solution, filter and collect the resulting yellow precipitate, wash with 1000ml of deionized water for 5 times, then add 50ml of A 10% diethylene glycol dimethyl ether solution was stirred for 20 hours, filtered to obtain a yellow precipitate, and dried at 100° C. under normal pressure for 24 hours to obtain 15.3 g of a light yellow double metal cyanide catalyst.

Embodiment 2

[0034] Under stirring conditions, gradually add 10ml of 20% potassium cobaltcyanide aqueous solution dropwise to 10ml of 10% zinc chloride aqueous solution, filter and collect the resulting white precipitate, wash with 500ml of deionized water for 5 times, and then add 20ml Diethylene glycol dimethyl ether solution with a concentration of 10% was stirred for 20 h, filtered to obtain a white precipitate, and dried at 100° C. under normal pressure for 24 h to obtain 3.8 g of a white double metal cyanide catalyst.

Embodiment 3

[0036] Under stirring conditions, gradually add 10ml of 20% potassium cobaltcyanide aqueous solution dropwise to 10ml of 10% zinc chloride aqueous solution, filter and collect the resulting white precipitate, wash with 500ml of deionized water for 5 times, and then add 20ml A 10% tert-butanol solution was stirred for 20 h, filtered to obtain a white precipitate, and dried at 100° C. under normal pressure for 24 h to obtain 3.7 g of a white double metal cyanide catalyst.

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Abstract

The invention discloses a method for preparing double metal cyanide catalyst, so as to obtain the double metal cyanide catalyst with the structure of Aa Bb Cc Dd (H2O) e. The method comprises: halide water solution which has a certain concentration and contains one or more divalent metal(s) is gradually dripped with cyanide water solution containing one or more variable valency metal(s) B; after being filtered and fully washed for reaction, precipitate can be formed; then, chelating agent is added for reaction; after being separated and dried, the double metal cyanide catalyst can be obtained. The preparation method is simple and does not produce a great deal of waste water which is harmful to the environment; the unreacted chelating agent can be recycled, so that the production cost is low, and the method is beneficial to environmental protection. When being applied to the copolymerization of carbon dioxide / epoxide, the catalyst has good application effect.

Description

technical field [0001] The invention relates to a catalyst, in particular to a double metal cyanide catalyst. The present invention also relates to the preparation method and application of the double metal cyanide. [0002] It can be used to catalyze carbon dioxide / epoxide copolymerization to prepare aliphatic polycarbonate polyol. Background technique [0003] Carbon dioxide / epoxide can be reacted to prepare aliphatic polycarbonate polyol under the trigger of small molecule initiator. This reaction does not go through the reduction reaction of carbon dioxide. The product can be used as polyurethane raw material to prepare various high-performance polyurethane materials. Widespread concern. [0004] Double metal cyanide catalysts are a class of excellent carbon dioxide / epoxide copolymerization catalysts, which can be used to prepare aliphatic polycarbonate polyols and high molecular weight polycarbonate resins. US 4500704 uses a complex of zinc ferricyanide and diglyme a...

Claims

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Application Information

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IPC IPC(8): B01J31/22C08G64/34
Inventor 蔡志华
Owner 湖南领湃达志科技股份有限公司
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