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Nanofiltration membrane for seawater desalination and preparation method thereof

A nanofiltration membrane and hydrophilic technology, which is applied in the field of nanofiltration membrane for seawater desalination and its preparation, can solve the problems of only removing some bacteria, macromolecules, and large-particle organic matter in seawater, and cannot remove organic matter with small molecular hardness. , to achieve the effect of anti-pollution ability and performance improvement, high surface smoothness, good surface smoothness

Active Publication Date: 2015-09-30
VONTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional treatment method cannot effectively remove small molecular hardness organic matter, but can only remove some bacteria, macromolecules, and large particle organic matter in seawater, so membrane fouling and scaling are inevitable.

Method used

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  • Nanofiltration membrane for seawater desalination and preparation method thereof
  • Nanofiltration membrane for seawater desalination and preparation method thereof
  • Nanofiltration membrane for seawater desalination and preparation method thereof

Examples

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Effect test

Embodiment 1

[0041] A preparation method of a nanofiltration membrane for seawater desalination, comprising the following steps:

[0042] (1) Preparation of polysulfone solution: Disperse 10 grams of isopropanol in 890 grams of N,N-dimethylformamide, stir at 1600 rpm for 30 minutes to completely dissolve the isopropanol; disperse 100 grams of yellowed polysulfone Put it in the mixed solution, and raise the temperature to 40°C, adjust the stirrer to stir and dissolve at 1400rpm for 12h, after it is completely dissolved, put the resulting solution in an oven with a vacuum degree of -80KPa for vacuum degassing for 10h, and obtain a polysulfone solution ;

[0043] (2) Preparation of polymer solution for ultra-thin porous transition layer:

[0044] A. Disperse 10 grams of isopropanol in 40 grams of N,N-dimethylformamide to obtain a mixed solution of pore-forming agent solvent;

[0045] B. Dissolve 15 grams of sulfonated polysulfone in the mixed solution of pore-forming agent solvent, and heat...

Embodiment 2

[0050] A preparation method of a nanofiltration membrane for seawater desalination, comprising the following steps:

[0051] (1) Preparation of polysulfone solution: Disperse 10 grams of ethylene glycol in 60 grams of N,N-dimethylacetamide, and mechanically stir at 1500 rpm for 30 minutes. After the ethylene glycol is completely dissolved, 30 grams of sulfone Disperse the polyethersulfone in the mixed solution, raise the temperature to 60°C, adjust the mechanical stirrer to stir and dissolve at 1300rpm for 12h, and after it is completely dissolved, place the obtained solution in an oven with a vacuum degree of -80KPa for degassing for 10h , to obtain polysulfone solution;

[0052] (2) Preparation of polymer solution for ultra-thin porous transition layer:

[0053] A. 1 gram of ethylene glycol is dispersed in 99 grams of N,N-dimethylacetamide to obtain a mixed solution;

[0054] B. Dissolve 5 grams of sulfonated polyethersulfone in the mixed solution, heat to 120°C and dissol...

Embodiment 3

[0059] A preparation method of a nanofiltration membrane for seawater desalination, comprising the following steps:

[0060] (1) Preparation of polysulfone solution: Disperse 5 grams of glycerol in 75 grams of dimethyl sulfoxide, and mechanically stir at 1700 rpm for 30 minutes. After all the solutions are dissolved, disperse 20 grams of cellulose triacetate in the mixed solution , and raised the temperature to 120°C, adjusted the mechanical stirrer to stir and dissolve at 1500rpm for 12h, after it was completely dissolved, put the obtained solution in an oven with a vacuum degree of -80KPa for degassing for 10h, and obtained a polysulfone solution;

[0061] (2) Preparation of polymer solution for ultra-thin porous transition layer:

[0062] A. 10 grams of glycerol are dispersed in 90 grams of dimethyl sulfoxide to obtain a mixed solution;

[0063] B. Dissolve 17.5 grams of cellulose triacetate in the mixed solution and heat to 120°C to dissolve until the solution is clear; ...

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Abstract

The invention relates to the technical field of membranes, and particularly relates to a nanofiltration membrane for seawater desalination. The nanofiltration membrane structurally comprises a non-woven cloth layer, a polysulfone porous support layer, an ultrathin porous transition layer and a polyamide cross-linked network desalination layer, wherein the ultrathin porous transition layer with the thickness of 5-10 microns is arranged between the polysulfone porous support layer and the polyamide cross-linked network desalination layer. The invention also relates to a preparation method of the nanofiltration membrane. The preparation method comprises the steps of preparation of the polysulfone porous support layer, preparation of the ultrathin porous transition layer and preparation of the polyamide cross-linked network desalination layer. The impedance and the pollution resistance of the nanofiltration membrane and the discrimination to a monovalent ion and a divalent ion are enhanced; the surface structure, the hydrophilic-to-hydrophobic property and the levelness of the nanofiltration support layer are adjusted effectively, so that the nanofiltration support layer is good in surface smoothness.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a nanofiltration membrane for seawater desalination and a preparation method thereof. Background technique [0002] Due to the shortage of fresh water resources, the problem of seawater desalination needs to be solved urgently. Traditional seawater desalination methods mainly include reverse osmosis, multi-effect evaporation, multi-stage flash evaporation, etc. However, traditional treatment methods cannot effectively remove small molecular hardness organic matter, but only part of the bacteria, macromolecules, and large particle organic matter in seawater, which inevitably produces membrane fouling and scaling. Nanofiltration membrane technology is a new type of membrane separation technology, which has been widely used in chemical environment engineering, water treatment, etc.; nanofiltration membrane can remove SO in seawater 4 -2 , Mg 2+ , Ca 2+ Divalent ions such as di...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00B32B3/24B32B27/12B32B27/06C02F1/44C02F103/08
CPCY02A20/131
Inventor 梁松苗蔡志奇吴宗策许国扬
Owner VONTRON TECH CO LTD
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