Preparation method for phase transfer catalytic film

A phase transfer catalysis and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., can solve problems such as reaction progress and reduce the risk of combustion and explosion , Easy to recycle and reuse, the effect of high catalytic activity

Inactive Publication Date: 2020-02-11
杜倩
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the absence of a phase transfer catalyst, the two phases are isolated from each other, several reactants cannot come into contact, and the reaction proceeds very slowly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Catalyst preparation:

[0021] Dissolve 8 parts of butyltrimethylammonium bromide in 10 parts of ethanol solution, dissolve 33 parts of sodium tungstate in 100 parts of water, stir, adjust the pH value to 2 with hydrochloric acid, and then heat up to 90°C , Add the above-mentioned ethanol solution containing butyltrimethylammonium bromide, and then react at 90°C for 40min. Filter, wash with water, wash with ethanol, dry, and then dissolve it in 20 parts of phosphoric acid.

Embodiment 2

[0023] Raw material ratio: 50 parts of benzimidazole, 45 parts of N,N-dimethylformamide, 20 parts of diphenylmethane diisocyanate, 1 part of catalyst, 2 parts of chain extender, 2 parts of defoamer, pore forming agent 2 servings.

[0024] Test steps: Pour benzimidazole and N,N-dimethylformamide into the reaction kettle, mix with catalyst, chain extender, defoamer, and pore-forming agent, stir for 1 minute, and then add diphenylmethane Stir the diisocyanate for 1 minute, heat to 35°C; wash the bauxite, remove miscellaneous stones, dry in the sun, break up, sieve 8 meshes, continue to break large gravels, sieve 8 meshes, and then sieve at 800°C Calcination, immerse in acetic acid immediately after calcination, after the layers are peeled off, grind to form a powder; apply a release agent to the film-forming mold, and evenly sprinkle the above-mentioned powdery bauxite on the surface of the release agent , and keep the temperature of the mold at 20°C for 20 minutes, then preheat...

Embodiment 3

[0026] Raw material ratio: 55 parts of benzimidazole, 60 parts of N,N-dimethylformamide, 30 parts of diphenylmethane diisocyanate, 5 parts of catalyst, 5 parts of chain extender, 3 parts of defoamer, pore forming agent 3 copies.

[0027] Test steps: Pour benzimidazole and N,N-dimethylformamide into the reaction kettle, mix with catalyst, chain extender, defoamer, and pore-forming agent, stir for 2 minutes, and then add diphenylmethane Stir the diisocyanate for 2 minutes, heat to 40°C; wash the bauxite, remove miscellaneous stones, dry in the sun, break up, and sieve 8 meshes, continue to break large gravels, sieve 8 meshes, and then sieve them at 800-1000 Calcining at ℃, immerse in acetic acid immediately after calcination, after peeling off the layers, grind it into powder; smear the release agent on the film-forming mold, and evenly sprinkle the above-mentioned powdery bauxite on the release agent and keep the temperature of the mold at 30°C for 30 minutes, then preheat it ...

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PUM

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Abstract

The invention discloses a preparation method for a phase transfer catalytic film. The method comprises the following steps: pouring benzimidazole and N,N-dimethylformamide into a reaction kettle, performing mixing with a catalyst, a chain extender, an antifoaming agent and a pore-forming agent, performing stirring for 1-2 min, adding diphenylmethane diisocyanate, performing stirring for 1-2 min, and performing heating to 35-40 DEG C; coating a film-forming mold with a demolding agent, uniformly sprinkling powdery bauxite to the surface layer of the demolding agent, maintaining the temperatureof the mold at 20-30 DEG C for 20-30 min, performing preheating to about 40 DEG C, and keeping the temperature constant; pouring the above composition into the mold, and blowing the composition by using an air gun; and after 30-40 min, performing demolding and discharging. The method combines the advantages of a film reaction, and the catalytic reaction is performed in the form of the film; and the catalytic film has high catalytic activity, a simple preparation process, and good application prospects.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a preparation method of a phase transfer catalytic membrane. Background technique [0002] Phase transfer catalysis can accelerate or enable the reaction of substances in two immiscible solvents (liquid-liquid two-phase system or solid-liquid two-phase system). [0003] During the reaction, the catalyst transfers an entity that actually participates in the reaction (such as an anion) from one phase to another, so that it can meet the substrate and react. Phase transfer catalysis enables the reaction of ionic compounds with water-insoluble organic substances in low polarity solvents, or accelerates these reactions. [0004] Generally, there is a phase-transfer catalyzed reaction, and there are two phases of aqueous solution and organic solvent. The ionic reactant is often soluble in the aqueous phase and insoluble in the organic phase, while the organic substrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/12B01J35/02
CPCB01J31/123B01J35/02
Inventor 杜倩
Owner 杜倩
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