Pervaporation alcohol permselective membrane and preparation method thereof

A technology of alcohol-preferential permeation membrane and pervaporation, which is applied in the field of pervaporation-preferential alcohol permeation membrane and its preparation, can solve the problems of inability to surpass silicon-containing materials, low flux of permeation membrane, poor mechanical properties, etc., and achieve film-forming properties High efficiency, convenient operation, stable structure and performance

Inactive Publication Date: 2011-09-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymer membrane materials mainly include silicon-containing and fluorine-containing two categories, among which silicon-containing membranes based on polydimethylsiloxane (PDMS) always occupy a dominant position; although fluorine-containing membranes are more hydrophobic, due to The mechanical properties of the material are poor, and it usually takes the form of a composite film. Due to its incomplete match with the base film and its high crystallinity, the flux through the film after film formation is very small, and the impact factor cannot surpass silicon-containing films. material, thus not applied, such as Chinese patent CN1239012

Method used

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  • Pervaporation alcohol permselective membrane and preparation method thereof
  • Pervaporation alcohol permselective membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] 1) Equipped with casting solution:

[0031] Mix 10 parts of dried P(VDF-HFP) (Mw=150000, Mn=100000, PDI=1.83) with 2 parts of porogen PVP and 88 parts of solvent DMAc, stir and heat vigorously in an oil bath at 80°C for 24 hours , and then placed in an oven at 60°C for defoaming to form a film-making material. The film-making material is stored in an oven, that is, when the film is scraped, the temperature of the film-casting liquid is 60°C.

[0032] 2) Scratch film:

[0033] Take the casting solution out of the oven, scrape the film on a completely dry glass plate, set the scraper knife to 700 μm, and put it into water at 25°C immediately. Replace the gel bath at intervals of 2 to 3 hours until the phase inversion process is complete, then take out the membrane and dry it in an oven.

[0034] The P(VDF-HFP) asymmetric pervaporation preferential alcohol permeation membrane obtained above is applied to the separation of ethanol water system, ethanol is preferentially ...

Embodiment 2

[0036] 1) Equipped with casting solution:

[0037] Mix 20 parts of dried P(VDF-HFP) (Mw=180,000, Mn=120,000, PDI=1.74) with 5 parts of porogen LiCl and 75 parts of solvent ACT, and heat vigorously in a 40°C oil bath for 48 hours , and then placed in an oven at 40°C for defoaming to form a film-making material. The film-making material is stored in an oven, that is, when the film is scraped, the temperature of the film-casting solution is 40°C.

[0038] 2) Scratch film:

[0039] Take the above casting solution out of the oven, scrape the film on a completely dry glass plate, set the scraper knife to 1000 μm, place it in the air for 20s, and then put it into a 25wt% methanol / 75wt% water mixed gel bath at 40°C middle. Replace the gel bath at intervals of 2 to 3 hours until the phase inversion process is complete, then take out the membrane and dry it in an oven.

[0040] The P(VDF-HFP) asymmetric pervaporation preferential alcohol permeation membrane obtained above is applied...

Embodiment 3

[0043] 1) Equipped with film-making materials:

[0044] Mix evenly 25 parts of dried P(VDF-HFP) (Mw=350000, Mn=150000, PDI=1.91) with 6.5 parts of porogen LiCl and 68.5 parts of solvent DMAc, and heat vigorously in an oil bath at 100°C for 12 hours , and then placed in an oven at 25°C for defoaming to form a film-making material. The film-making material is stored in an oven, that is, when the film is scraped, the temperature of the film-casting solution is 25°C.

[0045] 2), scraping film:

[0046] Take the above casting solution out of the oven, scrape the film on a completely dry glass plate, set the scraper knife to 500 μm, place it in the air for 15 seconds, and then put it into an ethanol gel bath at 4°C. Replace the gel bath at intervals of 2 to 3 hours until the phase inversion process is complete, then take out the membrane and dry it in an oven.

[0047] The P(VDF-HFP) asymmetric pervaporation preferential alcohol permeation membrane obtained above is applied to the...

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Abstract

The invention discloses a pervaporation alcohol permselective membrane, which is an asymmetric membrane prepared from polyvinylidene fluoride and hexafluoropropylene by a phase inversion method. The invention also discloses the phase inversion preparation method of the pervaporation alcohol permselective membrane. The pervaporation alcohol permselective membrane prepared by using the method disclosed by the invention has the advantages of high flux, high separation performance, high membrane forming performance, high structural and performance stability, and the like, and is applicable to an ethanol separation system. The preparation method is simple in process, convenient for operation, high in efficiency, controllable in membrane structure and high in production repeatability.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a pervaporation preferential alcohol permeation membrane and a preparation method thereof. Background technique [0002] Due to its renewable and non-polluting characteristics, bioenergy is considered to be the most promising new energy source that can replace heavily polluting and non-renewable energy sources such as petroleum and coal. In the past ten years of development, cellulosic ethanol has become a bioenergy source. Even the mainstream of liquid fuel research. [0003] During the ethanol fermentation process, the product is significantly inhibited, and the accumulation of ethanol concentration to 8-10wt% will significantly reduce the fermentation yield. Using pervaporation technology to separate ethanol from the fermentation broth, in order to maintain the continuous and efficient fermentation process, is a a practical way. Compared with traditio...

Claims

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Application Information

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IPC IPC(8): B01D61/36B01D71/32B01D67/00C07C29/76C07C31/08
Inventor 张林陈敬文陈欢林程丽华
Owner ZHEJIANG UNIV
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