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Preparation method and application of double-metal cyanide catalyst

A double metal cyanide and double metal catalyst technology, applied in the field of catalytic systems, can solve the problems of reducing the amount of organic ligands used, achieve high catalytic activity and selectivity, wide applicability, and reduce consumption

Active Publication Date: 2020-12-25
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In general, although researchers are constantly streamlining and improving the preparation process of DMC in order to shorten the preparation cycle of DMC catalysts and reduce the amount of organic ligands, so far, it is difficult for DMC catalysts to simultaneously reduce the amount of organic ligands in the preparation process. Usage amount and high catalytic activity

Method used

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  • Preparation method and application of double-metal cyanide catalyst
  • Preparation method and application of double-metal cyanide catalyst
  • Preparation method and application of double-metal cyanide catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Preparation of DMC-1 using ethylene glycol dimethyl ether (DME) as extract:

[0056] (a) At a constant temperature of 30°C, 5g K 3 [Co(CN) 6 ] and a mixed solution of 30ml deionized water (the concentration of double metal cyanide is 0.5mol / L) dropwise added to the mixture made of 10g ZnCl 2 , 20ml of DME and 20ml of deionized water (the concentration of the metal salt is 1.84mol / L), after the dropwise addition is completed, continue to stir and react at a constant temperature of 30°C for 2h. The catalyst filter cake was obtained by filtration.

[0057] (b) Put the filter cake in the extraction device and use 100mL DME as the extraction liquid. After the DME is heated and vaporized, it will be condensed and dropped into the extraction device to wash the double metal cyanide catalyst, and then return to the container for storing the extraction liquid. Within, extract for 1h. Then, the extracted and washed precipitate was dried and pulverized to obtain 2.8 g of DMC-1....

Embodiment 2

[0060] Preparation of DMC-2 using methanol (MeOH) as organic ligand:

[0061] The preparation process of DMC-2 is the same as that of Example 1, except that the equal volume of DME is replaced by MeOH to obtain 2.6g DMC-2, the structural formula of which is: Zn 3 [Co(CN) 6 ] 2 1.35MeOH 1.21ZnCl 2 0.18H 2 O.

Embodiment 3

[0063] Preparation of DMC-3 using ethanol (EtOH) as organic ligand:

[0064] The DMC-3 preparation process is the same as in Example 1, except that the equal volume of DME is replaced by EtOH to obtain 2.6g DMC-3, and the structural formula is: Zn 3 [Co(CN) 6 ] 2 1.66EtOH 1.17ZnCl 2 0.22H 2 O.

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Abstract

The invention relates to a preparation method and application of a double-metal cyanide catalyst. The method comprises the following steps: dissolving a water-soluble metal cyanide salt into a mixed solution of deionized water, dropwise adding the mixed solution into a mixed solution of an organic ligand L1 of the water-soluble metal cyanide salt and the deionized water, adding or not adding an organic ligand L2, performing stirring for 0.5-6 hours, and carrying out centrifugal separation and precipitation; putting the precipitate into an extraction device, heating and vaporizing an extractionsolution into organic ligand steam or azeotropic steam of an organic ligand and water, and washing the precipitate dropwise added into the extraction device through condensation; and performing drying to obtain the double-metal cyanide catalyst. The obtained catalyst can efficiently catalyze copolymerization of epoxy compounds to prepare polyether ester polyol and homopolymerization of the epoxycompounds to prepare polyether polyol.

Description

technical field [0001] The invention belongs to the field of catalytic systems, and specifically relates to a simple preparation method of a double metal cyanide catalyst and its use in catalyzing the homopolymerization of epoxy compounds to prepare polyether polyols or to prepare polyether ester polyols by binary or ternary copolymerization with carbon dioxide and acid anhydrides. Alcohol process application. Background technique [0002] Double Metal Cyanide Catalyst (abbreviated as DMC) is a highly efficient catalyst developed by General Tire & Rubber Company of the United States in the 1960s that can be used for ring-opening polymerization of epoxy compounds, cyclic anhydrides and episulfide compounds. It is currently mainly used for ring-opening homopolymerization of epoxy compounds to prepare polyether polyols and copolymerization with carbon dioxide to prepare polycarbonate polyether polyols. It has the advantages of high activity, low unsaturation, and narrow molecu...

Claims

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Application Information

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IPC IPC(8): C08G64/34C08G65/28
CPCC08G64/34C08G65/2663C08G65/2609C08G65/2603C08G65/2615
Inventor 刘宾元董金成张逍
Owner HEBEI UNIV OF TECH
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