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A kind of preparation method of organic forward osmosis membrane

A forward osmosis membrane, an organic technology, applied in the field of membrane separation, can solve the problems of low rejection rate, low membrane strength, and small permeation flux, so as to reduce internal concentration polarization, increase permeation flux, and increase antibacterial performance Effect

Active Publication Date: 2017-11-10
薛立新
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The organic forward osmosis membrane produced by the existing method has poor hydrophilicity, large internal concentration polarization, small permeation flux, low rejection rate and poor antibacterial property, low membrane strength, and poor practical performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Using cellulose triacetate as the polymer, 13.1% (V%) cellulose triacetate and 0.9% (V%) of chitin nanocrystals were added to 57.8% (V%) of 1,4-dioxane , 19.6% (V%) acetone and 8.6% (V%) methanol in a mixed solvent, stirred at a temperature of 60 ℃ for 9 hours to dissolve the formation of chitin nanocrystals with a content of 0.9% (V%) Casting liquid; let stand for more than 24 hours to completely degas; stir the casting liquid evenly, after standing for degassing, coat it on the substrate, and use a scraper to evenly scrape on the substrate to form a bottom film layer, The bottom mold layer on the material is allowed to stand in the air for 30 seconds, and then the bottom film layer is put into a gel bath (the composition of the gel bath is deionized water) and the gel is transformed into a dense skin film. The membrane is heat-treated in a water bath at 50°C for 5 minutes, and after cleaning, it is stored in a 1% sodium bisulfite solution for later use.

[0018] The flu...

Embodiment 2

[0021] Using cellulose diacetate as the polymer, 12.2% (V%) of cellulose diacetate and 0.8% (V%) of 1-pyrene butyric acid nanoparticles were added to 55.1% (V%) of 1,4-bis In a mixed solvent of oxane, 20.6% (V%) acetone, 7.2% (V%) methanol and 4.2% (V%) lactic acid, stir at 70℃ for 24 hours to dissolve to form 0.9 % (V%) of chitin nanocrystals casting film; let stand for more than 24h to completely degas; ultrasonic dispersion for 30min; stir the casting liquid evenly, after standing for deaeration, coat it on the substrate, and use Scrape the base film evenly on the substrate with a spatula. Let the base film on the substrate stand in the air for 15 seconds, and then put the base film in the gel bath and undergo phase conversion to gel into a dense skin layer. The membrane is cleaned with deionized water to remove the residual organic solvents to prepare an organic forward osmosis membrane, and the membrane is heat-treated in a 60℃ water bath for 10 minutes. After thorough cle...

Embodiment 3

[0025] Weigh 20g polysulfone polymer and dissolve it in 80g mixed solvent consisting of N,N-dimethylacetamide and polyethylene glycol 400 (the ratio of the two is 72:8), and the polymer concentration is 20% Polysulfone solution; add 1g of organic carbon nanotubes to the prepared polysulfone solution, disperse in ultrasound for 30 minutes to prepare a casting solution containing 1wt% of organic carbon nanotubes, stir the casting solution evenly and statically After defoaming, it is coated on the substrate, and the bottom film layer is uniformly scraped on the substrate with a spatula. The bottom mold layer is put into a gel bath to form a gel film, using m-phenylenediamine and pyromellitic acid The acid chloride undergoes interfacial polymerization reaction on the formed membrane and reacts at 110°C for 3 minutes; after the interfacial polymerization reaction, the prepared membrane is washed with deionized water to remove residual organic solvents, thereby preparing an organic fo...

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Abstract

The invention discloses a method for preparing an organic forward osmosis membrane. According to the preparation method, nanometer particles are added, and the preparation method comprises the specific steps of matching, stirring, standing still, coating and the like. The prepared organic forward osmosis membrane remarkably improves hydrophilia of the membrane, reduces internal concentration difference polarization, improves permeation flux, reserves a high retention rate, remarkably improves antimicrobial property, enhances strength of the membrane due to the nanometer particle size and is more practical.

Description

Technical field [0001] The invention relates to a method for preparing a permeable membrane, in particular to a method for preparing an organic forward osmosis membrane, and belongs to the technical field of membrane separation. Background technique [0002] FO (Forward Osmosis) technology is an osmosis-driven membrane process that has the characteristics of low energy consumption, low pollution and high recovery. It has realistic or potential application prospects in the fields of seawater desalination, wastewater treatment, energy power generation, food processing, and drug concentration. . However, the lack of efficient FO membrane materials greatly restricts the development of FO technology. The membrane materials currently used in the FO process all have an asymmetric structure, consisting of a thin selective separation layer and a porous support layer. In the FO process, there are external and internal concentration polarizations, especially the internal concentration pola...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/16B01D71/68B01D69/12B01D67/00
CPCB01D67/0013B01D69/12B01D71/16B01D71/68B01D2323/02B01D2325/36B01D2325/48
Inventor 薛立新张安将赵秀兰刘义平潘惠凯盛建芳
Owner 薛立新
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