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: 2016-08-31
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

[0016] Using triacetate cellulose as a polymer, 13.1% (V%) triacetate cellulose and 0.9% (V%) chitin nanocrystals were added to 57.8% (V%) 1,4-dioxane , 19.6% (V%) of acetone and 8.6% (V%) of methanol in a mixed solvent, stirred at a temperature of 60°C for 9 hours to dissolve and form chitin nanocrystals with a content of 0.9% (V%) Casting solution; let it stand for more than 24 hours to completely defoam; stir the casting solution evenly and apply it on the substrate after standing for degassing, and use a scraper to scrape evenly on the substrate to form a bottom film layer, and apply the substrate The bottom mold layer on the material is left 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) to form a film with a dense skin layer through phase inversion gel, and The membrane was heat-treated in a water bath at 50° C. for 5 minutes, and after cleaning, it was stored in 1% sodium bis...

Embodiment 2

[0020] Take by weighing 20g polysulfone polymer, be dissolved in 80g by the mixed solvent that N,N-dimethylacetamide and polyethylene glycol 400 form (the ratio of both is 72:8), be made into polymer concentration and be 20% Add 1g of organic carbon nanotubes to the prepared polysulfone solution, disperse in ultrasonic for 30 minutes to prepare a casting solution containing 1wt% organic carbon nanotubes, stir the casting solution evenly, and statically After defoaming, it is coated on the substrate, and scraped evenly on the substrate with a scraper to form a bottom film layer, and the bottom mold layer is put into a gel bath to form a gel film. The acid chloride was subjected to interfacial polymerization reaction on the formed membrane, and reacted at 110° C. for 3 minutes; after the interfacial polymerization reaction, the prepared membrane was washed with deionized water to remove residual organic solvent, thereby preparing an organic forward osmosis membrane.

[0021] The...

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Abstract

The invention discloses a preparation method of an organic forward-osmosis membrane. Nanoparticles are added in the preparation method; the preparation method specifically comprises the steps of proportioning, stirring, standing, coating and the like. The prepared organic forward-osmosis membrane allows the hydrophilicity of the membrane to be significantly improved, reduces the internal concentration difference polarization, improves the osmosis flux, retains high interception rate, and significantly increases the antibacterial properties; and because of the nano particle size, the membrane strength is also enhanced, and the organic forward-osmosis membrane is more practical.

Description

technical field [0001] The utility model relates to a preparation method of a permeable membrane, in particular to a preparation method of an organic forward osmosis membrane, which belongs to the technical field of membrane separation. Background technique [0002] FO (Forward Osmosis) technology is an osmosis-driven membrane process with low energy consumption, low pollution, high recovery, etc. It has realistic or potential application prospects in seawater desalination, wastewater treatment, energy generation, food processing, drug concentration, etc. . 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 both external concentration polarization and internal concentration polarization, especially the internal concentration pola...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/02B01D71/16B01D71/68B01D67/00
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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