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A kind of forward osmosis membrane based on interface hydrophilic modification and preparation method thereof

A forward osmosis membrane, hydrophilic modification technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., to achieve the effect of reducing tortuosity, reducing osmotic resistance, and reducing brine ratio

Active Publication Date: 2018-03-09
OCEAN UNIV OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have their own limitations

Method used

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  • A kind of forward osmosis membrane based on interface hydrophilic modification and preparation method thereof
  • A kind of forward osmosis membrane based on interface hydrophilic modification and preparation method thereof
  • A kind of forward osmosis membrane based on interface hydrophilic modification and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0053] (1) Soak the polypropylene (PP) non-woven support material (basis weight 52 g / m2, thickness 85 microns) with acetone to remove impurities adsorbed on the surface, and then dry it for later use;

[0054] (2) Immerse the treated non-woven support material in an aqueous solution of hydrophilic polymer polyvinyl alcohol (PVA) with a mass percent concentration of 0.05%, 0.1%, 0.3%, and 0.5%, respectively, and then remove the excess solution, Dry and reserve;

[0055] (3) Add 13.1% (V%) cellulose triacetate (CTA) to 52.4% (V%) 1,4-dioxane, 19.7% (V%) acetone, 8.2% (V%) methanol In a mixed solvent of 6.6% (V%) lactic acid, heat and stir at 40°C to dissolve, and let it stand for more than 24 hours to completely defoam;

[0056] (4) Pour the above-mentioned casting solution on the dried support material, scrape the film with a scraper with a gap of 150 microns, volatilize in the air for 30 seconds at room temperature and 90% relative humidity, and then immerse it in deionized w...

Embodiment 5

[0060] (1) Soak the polyester (PET) non-woven support material (basis weight 55 g / m2, thickness 66 microns) with acetone to remove impurities adsorbed on the surface, and then dry it for later use;

[0061] (2) Immerse the treated non-woven support material in an aqueous solution of hydrophilic polymer polyvinyl alcohol (PVA) with a concentration of 0.3% by mass, then remove the excess solution, and dry it for later use;

[0062] (3) Add 10.1% (V%) cellulose triacetate (CTA) to 54.4% (V%) 1,4-dioxane, 20.7% (V%) acetone, 8.2% (V%) methanol In a mixed solvent of 6.6% (V%) lactic acid, heat and stir at 40°C to dissolve, and let it stand for more than 24 hours to completely defoam;

[0063] (4) Pour the above-mentioned casting solution on the dried support material, scrape the film with a scraper with a gap of 160 microns, volatilize in the air for 30 seconds at room temperature and 80% relative humidity, and then immerse it in deionized water to make it dry. Gel to obtain nasce...

Embodiment 6

[0067] (1) Soak the polyester (PET) non-woven support material (basis weight 55 g / m2, thickness 66 microns) with acetone to remove impurities adsorbed on the surface, and then dry it for later use;

[0068] (2) Immerse the treated non-woven support material in a mixed solution of hydrophilic polymer polyvinyl alcohol (PVA) and cross-linking agent with a concentration of 0.3% by mass, react at 50°C for 1 hour, and then remove The excess solution was dried for later use; the crosslinking solution contained 10 vol.% sulfuric acid, 10 vol.% acetic acid, 10 vol.% methanol, and 2wt.% glutaraldehyde (GA) at a volume ratio of 1:2:3;

[0069] (3) Add 10.1% (V%) cellulose triacetate (CTA) to 54.4% (V%) 1,4-dioxane, 20.7% (V%) acetone, 8.2% (V%) methanol In a mixed solvent of 6.6% (V%) lactic acid, heat and stir at 40°C to dissolve, and let it stand for more than 24 hours to completely defoam;

[0070] (4) Pour the above-mentioned casting solution on the dried support material, scrape t...

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Abstract

The invention discloses a forward osmosis membrane based on interfacial hydrophilic modification, which comprises a separation skin layer on the surface, a porous support layer in the middle and a non-woven fabric support material at the bottom, and is characterized in that the porous support layer and the non-woven fabric There is also a hydrophilic polymer layer between the support materials, and the hydrophilic polymer layer is embedded in the non-woven support material. The material of the non-woven supporting material is polyolefin or polyester. The hydrophilic polymer can also be crosslinked by a crosslinking agent. The present invention, through hydrophilic modification, on the one hand reduces the osmotic resistance of water in the osmosis process and improves the water flux; on the other hand, in the process of phase inversion, because water is more permeable, it is easier to undergo instantaneous phase inversion , forming a large pore structure, increasing the porosity and reducing the tortuosity of the pores, so it can significantly reduce the internal concentration polarization and improve the water flux of the membrane.

Description

technical field [0001] The invention belongs to the technical field of polymer separation membranes, in particular to a modified forward osmosis membrane and a preparation method thereof. Background technique [0002] The forward osmosis process is a concentration-driven process, which refers to the spontaneous transfer of water from the high water chemical potential area (feed liquid side) to the low water chemical potential area (drawing liquid side) through the selective semipermeable membrane, while the solute molecules and ions remain process in the original solution. Forward osmosis technology, with its outstanding advantages of low energy consumption, low membrane fouling, and high rejection rate, has developed rapidly in recent years, and has been applied in a series of fields such as water purification and desalination, food and pharmacy, and energy, showing Great advantage. [0003] With the rapid development of the application of the forward osmosis process, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/10B01D67/00B01D71/16
Inventor 王铎管盼盼范小青许增团
Owner OCEAN UNIV OF CHINA
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