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A kind of sulfonated polyvinyl alcohol catalytic composite membrane and its preparation method

A technology of sulfonated polyvinyl alcohol and composite membrane, which is applied in the field of materials, can solve problems such as catalyst loss, and achieve the effects of reducing corrosion, simple production, high separation factor and flux

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 method generally has a higher synthesis efficiency, but the catalyst is easy to lose into the reaction solution, which also needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Pretreatment of the support layer: cut the PAN support to an appropriate size, soak it in deionized water for 6 hours, and then fix it on a glass plate with a wide adhesive tape for use.

[0028] (2) Preparation of separation layer: prepare 3wt% sodium alginate (SA) solution: weigh 0.09 g of molybdenum disulfide powder (molybdenum disulfide is a lamellar structure), add 40 g of deionized water, and use a cell pulverizer to sonicate for 3 h , then use a 100mL volumetric flask to prepare the dispersion, then use an ultrasonic cleaner to sonicate for 6 hours, and then use it for later use; pour the above 97ml dispersion into a beaker, add 3g of sodium alginate powder, cover with plastic wrap, and stir in a 60°C water bath Heat until dissolved, then turn off the stirring switch, let it stand at constant temperature for 3 hours, and take it out for use; scraping film: apply the sodium alginate solution after standing still on the PAN support with a scraping machine, and t...

Embodiment 2

[0033] (1) Pretreatment of the support layer: cut the PAN support to an appropriate size, soak it in deionized water for 8 hours, and then fix it on a glass plate with a wide adhesive tape for use.

[0034] (2) Preparation of separation layer: prepare 1.5wt% sodium alginate (SA) solution: first weigh 0.03g of molybdenum disulfide powder (molybdenum disulfide is a lamellar structure), add 40g deionized water, and use a cell pulverizer Sonicate for 2 hours, then use a 100mL volumetric flask to prepare a dispersion, then use an ultrasonic cleaner to sonicate for 8 hours, and put it into a beaker, add 1.5g of sodium alginate powder, cover with plastic wrap, and place at 30°C Stir and heat in a water bath until dissolved, then stand at constant temperature for 2 hours, take it out for use; scraping film: apply the sodium alginate solution after standing on the PAN support with a scraping machine, and set the height of the scraper to 0.45 mm, the scraping speed is 20m·min -1 , afte...

Embodiment 3

[0039] (1) Pretreatment of the support layer: the PAN support was cut to an appropriate size, soaked in deionized water for 12 hours, and then fixed on a glass plate with wide adhesive tape for use.

[0040] (2) Preparation of separation layer: prepare 1wt% sodium alginate (SA) solution: first weigh 0.005 g of molybdenum disulfide powder (molybdenum disulfide is a lamellar structure), add 40 g of deionized water, and use a cell pulverizer to sonicate 0.5h, then use a 99mL volumetric flask to prepare the dispersion, and then use an ultrasonic cleaner to sonicate for 10h, and then use it; pour the above dispersion into a beaker, add 1g of sodium alginate powder, cover with plastic wrap, and stir in a 35°C water bath Heat until dissolved, then turn off the stirring switch, let it stand at constant temperature for 4 hours, take it out for use; scraping film: apply the sodium alginate solution after standing on the support with a scraping machine, and set the height of the scraper t...

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Abstract

The invention relates to a catalytic composite membrane of sulfonated polyvinyl alcohol and a preparation method thereof. It is characterized in that the catalytic composite membrane has a "sandwich" structure, that is, it includes a support layer, a separation layer and a catalytic layer. The support layer adopts a hydrophilic support body; the separation layer is made of MoS 2 The separation layer is prepared by adding sodium alginate (SA); the catalytic layer is prepared by cross-linking polyvinyl alcohol (PVA) with an acidic catalyst. Specific preparation method: soak the support with deionized water for pretreatment; dissolve SA in MoS 2 The separation layer casting liquid is prepared in the dispersion liquid, and the film is scraped to dry; the PVA solution, the acidic catalyst and the crosslinking agent are added together, stirred, and then coated on the dried separation layer, and the film is dried to prepare the catalytic layer. The invention adopts the chemical grafting method to graft the acidic catalyst on the PVA chain, so that the polymer chain can have more acid sites; at the same time, the chemical grafting method can minimize the loss of the catalyst.

Description

technical field [0001] The invention belongs to the field of materials and membrane separation technology, and in particular relates to a sulfonated polyvinyl alcohol double-layer catalytic 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 applications in human production and life. For example, as an industrial solvent, it can be used in coatings, adhesives, artificial leather, etc.; as an extractant, it can be used in the production of medicines, organic acids and other products; as a raw material for spices, It can be used in whiskey, butter, etc.; as an extractant, it can extract many compounds from aqueous solution, as an organic solvent, and as a standard substance for calibrating thermometers when separating sugars, so ethyl acetate i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/38B01D71/08B01D71/02B01D71/82B01D69/12B01D69/10B01D67/00B01J31/10
CPCB01D71/38B01D71/08B01D71/02B01D71/82B01D69/125B01D69/12B01D69/105B01D67/0079B01J31/10B01D2325/10
Inventor 李卫星刘青邢卫红
Owner NANJING TECH UNIV
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