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A kind of high strength and high water flux composite forward osmosis membrane and its preparation method and application

A forward osmosis membrane, high-strength technology, applied in the field of fiber membranes, to achieve the effects of thin support layer, reduced concentration polarization, high water flux and salt rejection

Active Publication Date: 2017-04-12
中科检测技术服务(广州)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, polysulfone and polyester are the most widely used support layer materials in forward osmosis membranes, but these materials cannot achieve high water flux of forward osmosis membranes when the thickness of the support layer is not high

Method used

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  • A kind of high strength and high water flux composite forward osmosis membrane and its preparation method and application
  • A kind of high strength and high water flux composite forward osmosis membrane and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A high strength and high water flux composite forward osmosis membrane is prepared by the following method:

[0051] (1) Dissolve 12 parts by weight of Kevlar fibers in 160 parts by weight of N-methylpyrrolidone (NMP), add 12 parts by weight of tetraethylammonium hydroxide and 4 parts by weight of lithium chloride, and stir at 28°C for 8 days to form Uniform, transparent black-red Kevlar nanofiber dispersion;

[0052] (2) Add 6 parts by weight of PEG-400 to the Kevlar nanofiber dispersion in step (1), stir with 200rpm rotating speed for 12h to form a uniform casting solution; vacuum degas the casting solution for 4h at 133Pa, and set aside ;

[0053] (3) Scrape the degassed casting liquid in step (2) on a clean glass plate with a scraper to make a 50um thick film; evaporate the solvent at 115°C for 5min, sink into a gel bath of distilled water at normal temperature for 15min, to obtain a gel film;

[0054] (4) Soak the gel film in distilled water for 24 hours, and th...

Embodiment 2

[0059] A high strength and high water flux composite forward osmosis membrane is prepared by the following method:

[0060] (1) Dissolve 15 parts by weight of Kevlar fibers in 200 parts by weight of N,N-dimethylformamide (DMF), add 15 parts by weight of potassium hydride and 5 parts by weight of lithium chloride, and stir at 50°C for 2 days to form Uniform, transparent black-red Kevlar nanofiber dispersion;

[0061] (2) Add 5 parts by weight of PVP-15 to the Kevlar nanofiber dispersion prepared in step (1), stir at 200rpm for 12h to form a uniform casting solution; vacuum degas the casting solution at 133Pa for 4h;

[0062] (3) Scrape the degassed casting solution on a clean glass plate with a scraper to form a film with a thickness of 150um, evaporate the solvent at 70°C for 4 minutes, sink into distilled water at room temperature for 35 minutes to form a gel film, and obtain a gel film;

[0063] (4) Soak the gel film in distilled water for 24 hours, and then put it in a vac...

Embodiment 3

[0068] A high strength and high water flux composite forward osmosis membrane is prepared by the following method:

[0069] (1) Add 16 parts by weight of Kevlar fiber to 200 parts by weight of N,N-dimethylacetamide (DMAC), then add 8 parts by weight of sodium hydride and 4 parts by weight of calcium chloride, and stir at 40°C for 4 days to form a uniform , Transparent black-red Kevlar nanofiber dispersion;

[0070] (2) Add 7 parts by weight of PEG-2000 to the Kevlar nanofiber dispersion prepared in step (1), stir at 200 rpm for 12 hours to form a uniform casting solution; vacuum degas the casting solution for 4 hours at 133 Pa and set aside ;

[0071] (3) Scrape the degassed casting solution on a clean glass plate with a scraper to make a 100um thick film, evaporate the solvent at 80°C for 3 minutes, sink into a solution with a volume ratio of distilled water / ethanol of 50 / 50 for 40 minutes to gel Forming a film to obtain a gel film;

[0072] (4) Soak the gel film in distil...

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Abstract

The present invention belongs to the technical field of fiber membranes and discloses a high-strength and high-water-flux composite forward osmosis membrane and its preparation method and application. This method is to first dissolve Kevlar fiber in an organic solvent, add additives and strong alkali, heat and stir to disperse, then add pore-forming agent, stir evenly, and vacuum degassing; then scrape the film to form a film, evaporate the solvent, and put in the gel Soak in a bath, then soak in water, heat treat, then soak in an aqueous solution of m-phenylenediamine for 15 to 30 minutes, take it out; soak in an organic solvent solution of trimesoyl chloride, react for 30 to 120 seconds; take it out and dry it , heat treatment to obtain a composite forward osmosis membrane with high strength and high water flux. The permeable membrane prepared by the invention uses Kevlar fiber as the supporting layer, which has high membrane strength, thin supporting layer, high water flow rate and high salt interception rate.

Description

technical field [0001] The invention belongs to the technical field of fiber membranes, relates to a forward osmosis membrane, in particular to a composite forward osmosis membrane with high strength and high water flux, a preparation method and application thereof. The forward osmosis membrane has high strength, high water flux and good salt rejection. Background technique [0002] Compared with the membrane separation technology driven by external pressure, the most notable feature of forward osmosis membrane separation technology is that it does not require external pressure or operates under very low external pressure. It has the advantages of good separation effect, energy saving and environmental protection. It is used in food, medicine, energy, Seawater desalination and other fields have a wide range of application prospects. However, the strength of the forward osmosis membrane materials currently used is not high, and a thicker support layer is needed to meet the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D69/10B01D67/00C02F1/44
CPCB01D69/12B01D67/00412
Inventor 胡继文姜婷婷靳焘胡盛逾于发猛涂园园
Owner 中科检测技术服务(广州)股份有限公司