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PDMS/PVDF pervaporation composite membrane, preparation method and application thereof

A technology of pervaporation and composite membrane, which is applied in chemical instruments and methods, semi-permeable membrane separation, separation/purification of carboxylic acid compounds, etc., to achieve the effects of high permeation flux, good application prospect and low preparation cost

Inactive Publication Date: 2010-05-12
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After the 1980s, scholars from various countries have conducted extensive research on pervaporation membranes, but mainly focused on the discussion of preferential water-permeable membranes. At present, the dehydration of ethanol and isopropanol has been industrialized. However, for other organic matter The research on preferentially permeable membranes, especially the preferential separation of acetic acid in acetic acid aqueous solution, has not been reported in the prior art, so it is necessary to develop a new composite membrane to solve the problem of acetic acid separation in acetic acid aqueous solution

Method used

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  • PDMS/PVDF pervaporation composite membrane, preparation method and application thereof
  • PDMS/PVDF pervaporation composite membrane, preparation method and application thereof
  • PDMS/PVDF pervaporation composite membrane, preparation method and application thereof

Examples

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Embodiment 1

[0026] Example 1 Preparation of pervaporation composite membrane

[0027] Its preparation method is as follows: According to the required mass ratio, take 6 parts of polymer PDMS, 3 parts of solvent n-hexane, 0.4 part of crosslinking agent orthosilicate and 0.1 part of curing agent dibutyltin dilaurate, mix them, stir them evenly and Stand to defoam, pour it on the polyvinylidene fluoride microporous filter membrane with a pore size of 0.1 μm soaked in 20% polyethylene glycol aqueous solution for 24 hours, scrape it with a scraper to form a film, and let it stand at room temperature 24 hours to complete the cross-linking, and then soak the composite membrane in distilled water for 24 hours to dissolve the residual polyethylene glycol in the support layer. Finally, the composite membrane was dried under vacuum for 24 hours to obtain a PDMS / PVDF composite membrane with a total thickness of the composite membrane of 135 μm and a thickness of the skin separation layer of 35 μm.

Embodiment 2

[0028] Example 2 Preparation of pervaporation composite membrane

[0029] Its preparation method is as follows: according to the required mass ratio, take 6 parts of polymer PDMS, 4 parts of solvent n-hexane, 0.3 part of crosslinking agent tetraethyl orthosilicate and 0.2 part of curing agent dibutyltin dilaurate, mix, stir evenly and Stand to defoam, pour it on the polyvinylidene fluoride microporous filter membrane with a pore size of 0.2 μm soaked in 25% polyethylene glycol aqueous solution for 28 hours, scrape it with a scraper to form a film, and let it stand at room temperature 36h to make the cross-linking complete, and then soak the composite membrane in distilled water for 30 hours to dissolve the residual polyethylene glycol in the support layer. Finally, the composite membrane was dried under vacuum for 30 hours to obtain a PDMS / PVDF composite membrane with a total thickness of the composite membrane of 120 μm and a thickness of the skin separation layer of 30 μm. ...

Embodiment 3

[0030] Example 3 Preparation of pervaporation composite membrane

[0031] Its preparation method is as follows: according to the required mass ratio, take 6 parts of polymer PDMS, 3 parts of solvent n-hexane, 0.5 part of crosslinking agent tetraethyl orthosilicate and 0.05 part of curing agent dibutyltin dilaurate, mix them, stir them evenly and Stand to defoam, pour it on the polyvinylidene fluoride microporous filter membrane with a pore size of 0.45 μm soaked in 15% polyethylene glycol aqueous solution for 36 hours, scrape it with a scraper to form a film, and let it stand at room temperature 24 hours to complete the cross-linking, and then soak the composite membrane in distilled water for 36 hours to dissolve the residual polyethylene glycol in the support layer. Finally, the composite membrane was dried under vacuum for 36 hours to obtain a PDMS / PVDF composite membrane with a total thickness of the composite membrane of 135 μm and a thickness of the skin separation layer...

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Abstract

The invention discloses a PDMS / PVDF (polydimethylsiloxane / polyvinylidence fluoride) pervaporation composite membrane which comprises a polyvinylidence fluoride supporting layer and a polydimethylsiloxane separating layer with different bore diameters. The composite membrane has high separating capability and separating efficiency when applied to separating acetic acid in an acetic acid water solution. The PDMS / PVDF pervaporation composite membrane comprises a separating layer and a supporting layer, wherein the separating layer is uniformly attached on the supporting layer, the total thickness of the composite membrane is 120-150 micrometers, the thickness of the skin separating layer is 30-40 micrometers, the supporting layer is made of polyvinylidence fluoride microfiltration membranes with bore diameters being respectively 0.1-2.0 micrometers, and the separating layer is made of the polydimethylsiloxane.

Description

technical field [0001] The present invention relates to a pervaporation composite membrane, more specifically to a PDMS / PVDF (polydimethylsiloxane / polyvinylidene fluoride) pervaporation composite membrane; in addition the present invention also relates to the above-mentioned PDMS / PVDF polymer A pervaporation composite membrane preparation method and its application, especially the application in separating acetic acid aqueous solution. Background technique [0002] Acetic acid is one of the important organic chemical raw materials. Mainly used in the production of vinyl acetate, acetic anhydride, cellulose acetate, acetates, terephthalic acid, chloroacetic acid and acetates, etc. Acetic acid has been widely used in chemical industry, light industry, textile, medicine, printing and dyeing, rubber, pesticide, photographic medicine, electronics, food and other fields, with hundreds of derivatives. At present, there are many methods for studying the separation of acetic acid / w...

Claims

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Application Information

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IPC IPC(8): B01D71/70B01D71/34B01D69/12C07C53/08C07C51/42
Inventor 洪厚胜张庆文由涛陈龙祥
Owner NANJING UNIV OF TECH
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