Forward osmosis membrane based on interface hydrophilic modification and preparation method of forward osmosis membrane

A technology of forward osmosis membrane and hydrophilic modification, which is applied in the direction of semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., to achieve the effects of reducing tortuosity, reducing osmotic resistance, and reducing the ratio of salt water

Active Publication Date: 2015-12-30
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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  • Forward osmosis membrane based on interface hydrophilic modification and preparation method of forward osmosis membrane
  • Forward osmosis membrane based on interface hydrophilic modification and preparation method of forward osmosis membrane
  • Forward osmosis membrane based on interface hydrophilic modification and preparation method of forward osmosis membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0053] (1) Soak 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 water...

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 10vol.% sulfuric acid, 10vol.% acetic acid, 10vol.% 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 the ...

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Abstract

The invention discloses a forward osmosis membrane based on interface hydrophilic modification. The forward osmosis membrane comprises a separation peel layer arranged on the surface, a porous support layer arranged in the middle and a non-woven fabric support material arranged at the lower part. The forward osmosis membrane is characterized in that a hydrophilic polymer layer is also arranged between the porous support layer and the non-woven fabric support material, and is embedded into the non-woven fabric support material; the non-woven fabric support material is made of polyolefin or polyester. The hydrophilic polymer can also be interlinked through a crosslinking agent. The forward osmosis membrane has the advantages that through the hydrophilic modification, on the one hand, the permeation resistance of water in a permeation process is reduced, and the water flux is improved, and on the other hand, in a phase inversion process, the water can easily permeate, so that an instant phase inversion can be more easily generated; a large pore structure is formed; the porosity is improved; the sinuosity of pores is reduced, so that the inner concentration polarization can be obviously reduced; the water flux of the membrane is improved.

Description

Technical field [0001] The invention is a high -molecular separation film technology field, which specializes in a modified positive osmotic membrane and its preparation method. Background technique [0002] Positive infiltration process is a concentration driving process, which refers to the spontaneous water from high water chemical potential zone (raw material liquid side) to transmit it to the low -water chemical potential area (drawing liquid side) through selective semi -transparent membrane, while the soluble molecules and ions remain.Process in the original solution.Positive penetration technology has developed rapidly in recent years with low energy consumption, low -membrane pollution, and high -destruction rate. In recent years, it has developed rapidly. In the fields of water purification and dehydration, food and pharmacy, and energy, it has obtained a series of applications.Great superiority. [0003] With the rapid development of the application of positive permeab...

Claims

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Application Information

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Patent Type & Authority Applications(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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