Magnetic supported catalyst and use thereof in polyphenylene oxide preparation

A supported catalyst and catalyst technology, which is applied in the direction of chemical recovery, can solve the unsolved problems of catalyst recovery and reuse, and achieve the effects of large specific surface area, high catalytic efficiency and high catalytic efficiency

Inactive Publication Date: 2009-08-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, at present, the recovery and reuse of catalysts f

Method used

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  • Magnetic supported catalyst and use thereof in polyphenylene oxide preparation
  • Magnetic supported catalyst and use thereof in polyphenylene oxide preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Example 1 Preparation of Magnetic Loaded Metal Ion-PAMAM Dendrimer Catalyst

[0053] (1) Preparation of nano-ferric oxide

[0054] Prepare 250 mL of 0.5 mol / L sodium hydroxide solution and add it to a three-necked flask. Under the protection of nitrogen, the temperature was raised to 80°C. Configure 1mol / L FeCl 3 ·6H 2 O, 0.5mol / L FeCl 2 4H 2 O, 25 mL of 0.4 mol / L HCl solution was added to the above alkaline solution. Under mechanical stirring, react for 30 minutes. After the reaction, wash with distilled water and ethanol 5 times respectively. Vacuum drying at room temperature for 24 hours to prepare black nano iron ferric oxide powder.

[0055] (2) Surface amination of magnetic nanoparticles

[0056] 5g of the above-mentioned nano ferric oxide was redispersed in 200mL of toluene. Then 3 mL of 3-aminopropyltriethoxysilane was added. Heat to 105°C and react at this temperature for 20 hours with mechanical stirring. After the reaction, it was washed with meth...

Embodiment 2～4

[0063] The magnetically supported metal ion-PAMAM dendrimer catalyst was prepared according to the method of Example 1, except that the algebra of the copper compound and PAMAM (PAMAM Gn) was changed, as shown in Table 1.

[0064] Table 1

[0065] Example serial number Copper compound (mmol) Nitrogen content in PAMAM Gn (mmol) 2 Copper chloride (0.05) G2(0.1) 3 Copper nitrate (0.05) G3(0.1) 4 Copper sulfate (0.05) G4(0.1)

Embodiment 5～8

[0067] The magnetically supported metal ion-PAMAM dendritic compound catalyst was prepared according to the method of Example 1, except that the copper compound was replaced by a manganese compound, as shown in Table 2.

[0068] Table 2

[0069] Example serial number Manganese compound (mmol) Nitrogen content in PAMAM Gn (mmol) 5 Manganese chloride (0.05) G1(0.1) 6 Manganese bromide (0.05) G2(0.1) 7 Manganese nitrate (0.05) G3(0.1) 8 Manganese sulfate (0.05) G4(0.1)

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Abstract

The invention discloses a magnetic loaded catalyst of metallic ion-polyamide which is a composition of metallic ions and the polyamide treeing compound on the surfaces of Nano magnetic particles, the mol ratio of nitrogen-atoms and metallic ions in the polyamide treeing compound is 0.5 to 300, and the metallic ions are a cupric ion or manganese ions. The invention combines the characteristics that metallic ion-polyamide treeing compound complex catalyst has high catalytic efficiency and the Nano magnetic particles are easy to be recovered through a magnetic field, can enable PPO to obtain high yield when being applied to aqueous medium for preparing the PPO with only a little quantity, and can be recycled for reusage by the magnetic field after the oxypolymerization, thereby solving the problem that prior catalyst for preparing polyphenylether in the water medium has low catalytic efficiency and is difficult to recover.

Description

technical field [0001] The invention belongs to the technical field of polymer chemical industry, and in particular relates to a magnetic-loaded catalyst and the application of preparing polyphenylene ether in water medium. Background technique [0002] The recovery and reuse of catalysts can greatly reduce production costs and save resources. A common method for preparing a recyclable catalyst is to load the catalyst on a carrier (usually a micron-sized carrier), and recover the loaded catalyst by filtering or centrifuging after the reaction. However, usually the reactivity and selectivity of supported catalysts are reduced due to the presence of supports. Loading the catalyst on the nano-scale carrier can basically keep the original catalytic activity and selectivity of the supported catalyst. full contact. However, nanoscale catalysts are difficult to separate from the reaction system by traditional methods such as filtration. Therefore, the preparation of recyclable ...

Claims

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Application Information

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IPC IPC(8): C08G65/44
CPCY02P20/584
Inventor 顾成申屠宝卿翁志学
Owner ZHEJIANG UNIV
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