Functionalized polyvinyl alcohol catalytic composite membrane and preparation method thereof

A polyvinyl alcohol and polyvinyl alcohol solution technology, applied in the field of materials science, can solve the problems of slow swelling of hydrophilic polymers, decline in membrane separation performance, loss of membrane application, etc., so as to reduce water mass transfer resistance and improve conversion. rate, the effect of reducing damage

Active Publication Date: 2022-02-22
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This membrane layer is dual-purpose, that is, it has two functions of catalysis and separation. It is a very interesting attempt, but the catalytic layer is relatively rough, and the moisture generated in the esterification reaction will cause the hydrophilic polymer to slowly swell, which will The separation performance of the membrane is reduced, resulting in the loss of substances in the reaction system through the membrane, which will gradually lose the application of the membrane in the reaction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Pretreatment of the catalyst: Weigh 30g polycresol sulfonal aqueous solution, add 3g nano silicon dioxide and 30g ethanol solution, put into an ultrasonic cleaner for ultrasonic 1h, then place it in a rotary evaporator at 80°C and spin evaporate to Viscous, take out and set aside.

[0031] (2) Preparation of separation layer: prepare 3wt% PVA solution and 3wt% SA solution, mix 15gPVA and 35gSA solution (PVA:SA=0.42:1), then add glutaraldehyde 0.025g, sulfuric acid 0.025g and 5g water, stirred for 6h, and allowed to stand for defoaming. Using an automatic film scraping machine, slowly pour the casting solution into the glass plate, scrape the film, adjust the height of the scraper to 300 μm, and the scraping speed to 15m·min -1 , put it in a dust-proof net at room temperature, and dry it for later use.

[0032] (3) preparation of catalytic layer: prepare the PVA solution of 5wt%, get 30g solution, add the catalyzer 2g (catalyst is 0.1 of PVA mol ratio) in the PVA s...

Embodiment 2

[0036](1) Pretreatment of the catalyst: Weigh 30g of p-hydroxybenzenesulfonic acid solution, add 6g of nano zirconium dioxide and 15g of ethanol solution, put it into an ultrasonic cleaner for 2h to mix, and then place it in a rotary evaporator at 70°C to spin Steam until thick, take out and set aside.

[0037] (2) Preparation of separation layer: prepare 5wt% PVA solution and 1wt% SA solution, mix 20g PVA and 20g SA solution (PVA:SA=1:1), then add glutaraldehyde 0.04g, sulfuric acid 0.0125g and 5g water, stirred for 24h, filtered, and stood at room temperature for degassing for 12h. Using an automatic film scraping machine, slowly pour the casting solution onto the substrate to coat the scraping film, adjust the height of the scraper to 200 μm, and the scraping speed to 30m·min -1 , put it in a dust-proof net at room temperature, and let it dry for later use.

[0038] (3) preparation of catalytic layer: prepare the PVA solution of 8wt%, get 30g solution, add the catalyst 4....

Embodiment 3

[0041] (1) Pretreatment of the catalyst; Weigh 30g of polycresol sulfonaldehyde aqueous solution, add 6g of nano-titanium dioxide and 15g of ethanol solution, put it into an ultrasonic cleaner for 1h to mix, and then place it in a rotary evaporator at 60°C for rotary evaporation to Viscous, take out and set aside.

[0042] (2) Preparation of separation layer: prepare 7wt% PVA solution and 3wt% SA solution, mix 35gPVA and 15gSA solution (PVA:SA=2.33:1), then add glutaraldehyde 0.1g, sulfuric acid 0.025g and 5g water , Stir for 12h, filter, let stand for degassing for 8h. Using an automatic film scraping machine, slowly pour the casting solution onto the substrate to coat the scraping film, adjust the height of the scraper to 500 μm, and the scraping rate to 20m·min -1 , put it in a dust-proof net at room temperature, and let it dry for later use.

[0043] (3) preparation of catalytic layer: prepare the PVA solution of 10wt%, get 30g solution, add the catalyst 6.015g (catalyst...

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Abstract

The invention relates to a functionalized polyvinyl alcohol catalytic composite membrane and a preparation method thereof. It is characterized in that the catalytic composite membrane has a double-layer structure: the separation layer is composed of cross-linked polyvinyl alcohol (PVA) and sodium alginate (SA), and the catalytic layer is composed of acid catalyst cross-linked PVA. Its specific preparation method: after mixing PVA and SA solution, add a crosslinking agent for crosslinking, then scrape the film and dry it; after mixing PVA and pretreated acidic catalyst evenly, add a crosslinking agent to form a casting solution, Then it is coated on the separation layer, and the catalyst layer is prepared by impregnation phase inversion method. The invention uses a chemical grafting method to graft an acidic catalyst into the long chain of PVA so as to achieve the purpose of immobilizing the catalyst. Moreover, the present invention uses the impregnation phase inversion method to treat the composite membrane, so as to minimize the damage of moisture in the catalytic layer to the separation, and also form a porous structure, which reduces the mass transfer resistance of water removal during the reaction, and also increases the number of catalytic active sites. , improve the standardization rate of acetic acid.

Description

technical field [0001] The invention belongs to the field of material science and the field of membrane separation technology, in particular to a functionalized polyvinyl alcohol catalyzed composite membrane and a preparation method thereof. The polyvinyl alcohol catalyzed composite membrane prepared by the invention is mainly used for the esterification reaction of organic carboxylic acid and organic alcohol. Background technique [0002] Ethyl acetate has a wide range of uses, such as as an industrial solvent, it can be used in paints, adhesives, linoleum colorants, artificial fibers, etc.; as an adhesive, it can be used in the production of artificial pearls; as an extractant, it can be used in organic acids The production of products such as spices; as a spice raw material, it can be used as the main raw material of pineapple, banana, strawberry and other fruit essences and cream and other spices. [0003] Ethanol and acetic acid synthesize ethyl acetate and by-product ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/06C07C69/14C07C67/08B01D71/38B01D71/08B01D69/12B01D69/02B01D67/00
CPCB01J31/06C07C67/08B01D71/38B01D71/08B01D69/125B01D69/02B01D2325/10B01J2231/49
Inventor 李卫星刘青邢卫红
Owner NANJING TECH UNIV
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