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

A double metal cyanide and catalyst technology, applied in the field of catalytic systems, can solve the problems of reducing the usage of organic organic ligands, etc., and achieve the effects of high catalytic activity and selectivity, wide applicability, and reduced consumption

Active Publication Date: 2022-06-21
HEBEI UNIV OF TECH
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  • 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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  • A kind of preparation method and application of double metal cyanide catalyst
  • A kind of preparation method and application of double metal cyanide catalyst
  • A kind of 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, 5 g K 3 [Co(CN) 6 ] and 30ml of deionized water (the concentration of double metal cyanide is 0.5mol / L) was added dropwise to 10g of ZnCl 2 , 20ml of DME and 20ml of deionized water in a mixed solution (the concentration of the metal salt is 1.84mol / L), after the dropwise addition is completed, continue to stir and react for 2h at a constant temperature of 30°C. The catalyst filter cake was obtained by filtration.

[0057] (b) Place the filter cake in the extraction device and use 100 mL of DME as the extraction liquid. After DME is heated and vaporized, it is dripped into the extraction device by condensation to wash the double metal cyanide catalyst, and then returned to the container for storing the extraction solution. , extract for 1h. Then, the precipitate after extraction and washing 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 with MeOH to obtain 2.6g of DMC-2, and the structural formula 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 preparation process of DMC-3 is the same as in Example 1, except that the equal volume of DME is replaced by EtOH to obtain 2.6g of 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 the water-soluble metal cyanide salt in a mixed solution of deionized water, and adding dropwise to the organic ligand L of the water-soluble metal salt 1 After mixing the solution with deionized water, with or without the addition of organic ligand L 2 , stirred for 0.5 to 6 hours, centrifuged and precipitated; the precipitate was placed in an extraction device, and the extract was heated and vaporized into an organic ligand vapor or an azeotropic vapor of an organic ligand and water, which was condensed and dripped into the extraction device. The precipitate is washed; after drying, a double metal cyanide catalyst is obtained. The catalyst obtained in the invention can efficiently catalyze the copolymerization of epoxy compounds to prepare polyether ester polyols and the homopolymerization of epoxy compounds to prepare polyether polyols.

Description

technical field [0001] The invention belongs to the field of catalytic systems, in particular to a simple preparation method of a double metal cyanide catalyst and the method for preparing polyether polyol by catalyzing epoxy compound homopolymerization or preparing polyether ester polyol by binary or ternary copolymerization with carbon dioxide, acid anhydride applications in alcohol processes. Background technique [0002] Double metal cyanide catalyst (DMC for short) is an efficient catalyst developed by General Tire & Rubber Company in the 1960s for ring-opening polymerization of epoxy compounds, cyclic acid anhydrides and episulfide compounds. It is currently mainly used for the preparation of polyether polyols by ring-opening homopolymerization of epoxy compounds and the preparation of polycarbonate polyether polyols by copolymerization with carbon dioxide. It has the advantages of high activity, low unsaturation and narrow molecular weight distribution. [0003] Pat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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