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Supported catalyst with surface active effect and application thereof in preparing polyphenyl ether in oil-water two-phase system

A technology of supported catalyst and surface activity, which is applied in the field of supported catalyst and its preparation, and the preparation of polyphenylene ether by supported catalyst in oil-water two-phase medium, which can solve the problems of increased cost, complex system, and unrecoverable surfactant. , to achieve the effect of small size and large surface area

Active Publication Date: 2019-03-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method also needs to add surfactants, which makes the system more complicated, and the inability to recover surfactants will also increase costs and cause pollution

Method used

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  • Supported catalyst with surface active effect and application thereof in preparing polyphenyl ether in oil-water two-phase system
  • Supported catalyst with surface active effect and application thereof in preparing polyphenyl ether in oil-water two-phase system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1 Preparation of polyvinylimidazole ligands with silane coupling agent at one end

[0039] Dissolve 5.44 mL (60 mmol) of N-vinylimidazole and 0.6 mL (3 mmol) of 3-mercaptopropyltriethoxysilane in 60 mL of methanol, add 0.1 g of azobisisobutyronitrile as an initiator, and under nitrogen protection, Stir at reflux at 65°C for 48h. Distill under reduced pressure, add excess anhydrous ether to filter and wash, and dry to obtain a polyvinylimidazole ligand with a silane coupling agent at one end

Embodiment 2～4

[0041] The method of Example 1 is used to prepare polyvinylimidazole ligands with a silane coupling agent at one end, except that the type of silane coupling agent with a mercapto group used at one end and the amount of VI used in the synthesis are changed, as shown in Table 1. :

Embodiment 5

[0042] Embodiment 5 Preparation of supported catalyst with surface activity

[0043] Disperse the polyvinylimidazole with a silane coupling agent at one end prepared in Example 1, 30 mmol of methyltrimethoxysilane and 15 g of silica nanoparticles in toluene, heat and reflux in nitrogen for 4 hours, and centrifuge to obtain Particles with surface activity. The particles obtained above were dispersed in water, 15 mmol of copper chloride was added, stirred and centrifuged to obtain a supported catalyst with surface activity, and the copper loading was 3.1%.

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Abstract

The invention discloses a supported catalyst with a surface active effect. The supported catalyst is a complex of imidazole ligands and metal ions, and the complex is grafted in nano-silica particlessubjected to surface modification, wherein the nano-silica particles subjected to surface modification are nano silicon dioxide particles which are grafted on the surface of a silane coupling agent subjected to hydrophobic treatment and the surfaces of polyvinyl imidazole ligands with a silane coupling agent at one end. The catalyst is high in catalytic efficiency and good in product selectivity,and can catalyze an oxidative coupling polymerization reaction of phenol monomers is catalyzed in an oil-water two-phase system; after the reaction is finished, the catalyst and a surfactant can be recycled through centrifugation or filtration separation, so that greenness and environment friendliness are achieved, and the catalyst meets the requirements of sustainable development better.

Description

technical field [0001] The invention relates to the technical field of catalyst design, in particular to a supported catalyst with surface activity and a preparation method thereof, and the application of the supported catalyst with surface activity to prepare polyphenylene ether in an oil-water two-phase medium. Background technique [0002] Poly 2,6-dimethylphenylene ether (PPO) for short is one of the five major engineering plastics, because of its good dimensional stability, heat resistance, acid and alkali corrosion resistance, low dielectric constant, and low dissipation factor And so on, and widely used in electrical and electronic, automobile industry and machinery manufacturing and other fields. U.S. Patents US3,306,874, US3,306,875, US3,257,357, US3,257,358, etc. disclose the homogeneous phase of polyphenylene ether produced by oxidative coupling polymerization of phenolic monomers in organic solvents under the catalysis of monovalent copper complexes. method. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/44
CPCC08G65/44
Inventor 黄家辉王奂
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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