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PVA catalytic composite membrane functionalized with ionic liquid and preparation method thereof

A technology of ionic liquid and composite membrane, applied in the field of materials science, can solve the problems of large amount of ionic liquid, easy to be corroded, difficult to recycle, etc., and achieve the effects of low price, high conversion rate, and easy control

Active Publication Date: 2021-12-28
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method of immobilized ionic liquid can solve the problem of large amount of ionic liquid and difficult recovery to a certain extent, but it is easy to be corroded and peeled off during the esterification reaction

Method used

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  • PVA catalytic composite membrane functionalized with ionic liquid and preparation method thereof
  • PVA catalytic composite membrane functionalized with ionic liquid and preparation method thereof
  • PVA catalytic composite membrane functionalized with ionic liquid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0029] (1) First, weigh 3g of PVA solid powder (degree of polymerization is 1750), add it to a container with deionized water, and continuously stir at 90°C to obtain a PVA solution with a mass fraction of 3%; then, weigh 50g of PVA The solution is placed in a beaker, add the cross-linking agent glutaraldehyde (0.05% of the mass of PVA), stir evenly, filter out the insoluble impurities, let it stand for defoaming to obtain the separation layer casting liquid, adjust the height of the scraper to 100 μm, and adjust the scraping speed of the film. 50m·min -1 , the casting liquid was carefully coated on the substrate, and dried at room temperature for 2 days to obtain a separation membrane;

[0030](2) Take 30 g of PVA solution with a mass fraction of 3%, add a strongly acidic ionic liquid monomer 1-vinyl-3-sulfonic acid butylimidazole hydrochloride (the molar ratio of ILs to PVA is 0.1), place it at 60 In a constant temperature water bath at ℃, under the protection of nitrogen, ...

Embodiment example 2

[0034] (1) First weigh 5g of PVA solid powder (degree of polymerization is 2050), add it to a container with deionized water, and continuously stir at 95°C to obtain a PVA solution with a mass fraction of 5%; then, weigh 50g of PVA solution, add the cross-linking agent glutaraldehyde (0.1% of the mass of PVA), stir evenly, filter out the insoluble impurities, let stand for defoaming to obtain the separation layer casting liquid, adjust the height of the scraper to 100μm, and adjust the scraping speed to 10m·min -1 , the casting liquid was carefully coated on the substrate, and dried at room temperature for 3 days to obtain a separation membrane;

[0035] (2) take 30g of PVA solution whose mass fraction is 5%, add strong acid ionic liquid monomer 1-vinyl-3-sulfonic acid propyl imidazole hydrogen sulfate (mol ratio of ILs to PVA is 0.2), place it at 75 In a constant temperature water bath at ℃, under the protection of nitrogen, first purge for 30min, then add the initiator potas...

Embodiment example 3

[0039] (1) First, weigh 10g of PVA solid powder (degree of polymerization is 1750), add it to a container with deionized water, and continuously stir at 100°C to obtain a PVA solution with a mass fraction of 10%; then, weigh 30g of PVA solution, add cross-linking agent maleic acid (0.1% of the mass of PVA), stir at room temperature, filter out insoluble impurities, let stand for defoaming to obtain separation layer casting liquid, adjust the height of the scraper to 200μm, and the scraping speed to 5m· min -1 , the casting liquid was carefully coated on the substrate, dried at room temperature for 2 days, and finally a separation membrane with high separation performance was obtained;

[0040] (2) Take 30g of PVA solution with a mass fraction of 8%, add a strongly acidic ionic liquid monomer 1-enebutyl-3-sulfonic acid butylimidazolium trifluoromethanesulfonate (the molar ratio of ILs to PVA is 0.3 ), placed in a constant temperature water bath at 80°C, under the protection of...

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Abstract

The invention relates to a catalytic composite membrane functionalized with ionic liquid and a preparation method thereof. The catalytic composite membrane has a double-layer structure, the separation layer adopts a polyvinyl alcohol (PVA) membrane crosslinked by a crosslinking agent, and the catalytic layer adopts a PVA membrane functionalized with an acidic ionic liquid. Its specific preparation method: the separation layer uses a cross-linking agent to cross-link the PVA film, and the catalytic layer is under the protection of an inert gas, and the strongly acidic ionic liquid (ILs) containing double bonds is grafted and polymerized with PVA through free radical polymerization. A catalytic composite membrane with a double-layer structure is prepared by the solvent evaporation method; the present invention grafts and copolymerizes a type of strongly acidic ionic liquid on the PVA molecular chain through a chemical grafting method, so that each unit on the polymer chain contains an acidic site , thereby greatly improving the catalytic activity and catalytic stability of the PVA membrane, and showing high catalytic performance in the esterification reaction; at the same time, the ionic liquid is immobilized on the PVA membrane in the form of chemical bonds, which better solves the problem of ionic liquid The problem of easy loss.

Description

technical field [0001] The invention belongs to the field of materials science and the technical field of membrane separation, and particularly relates to an ionic liquid functionalized PVA catalytic composite membrane for promoting esterification reaction and a preparation method thereof. Background technique [0002] Ester compounds are an important fine chemical product, widely used in petrochemical, pharmaceutical, paint, fragrance, plasticizer and other chemical industries, and will also be used as biodiesel to replace petrochemical diesel. Esterification is a traditional process for directly synthesizing carboxylate. This process usually uses a liquid strong acid such as concentrated sulfuric acid as an esterification catalyst, which is easy to cause equipment corrosion, difficult to handle reaction waste, difficult product separation, and comprehensive production costs. The difficult separation and recycling of the catalyst for the esterification reaction are the key ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/06
Inventor 李卫星张莉邢卫红
Owner NANJING TECH UNIV
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