Preparation method of chlorine-resistant composite nanofiltration membrane

A composite nanofiltration membrane and chlorine-resistant technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve problems such as depletion, lack of chlorine resistance evaluation methods, and membrane performance decline, and achieve the effect of simple process

Active Publication Date: 2021-08-10
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing aromatic polyamide composite membranes are easily attacked by active chlorine, resulting in a sharp decline in membrane performance or even failure
Chlorination degradation has become a technical bottleneck restricting the wide application of membrane separation technology
However, at present, there is no unified conclusion on the mechanism of chlorine resistance degradation, and there is a lack of uniform standard chlorine resistance evaluation method

Method used

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  • Preparation method of chlorine-resistant composite nanofiltration membrane
  • Preparation method of chlorine-resistant composite nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Activation: immerse the polytetrafluoroethylene microporous membrane in 50% ethanol aqueous solution for 1 min. After draining, the active base film was obtained.

[0029] (2) Water phase immersion: immerse the active base film described in step (1) in an aqueous solution of 0.1% mass concentration of amine monomers, stay for 5 minutes, take it out and dry it in the air to obtain the first intermediate film;

[0030] (3) Oil phase impregnation: immerse the first intermediate film described in step (2) in the organic solvent solution of acid chloride monomers with a mass concentration of 0.1%, stay for 5 minutes, and then place it in the air to dry to obtain the second intermediate film. Two intermediate membranes;

[0031] (4) Post-treatment: rinse the second interlayer with deionized water, then place it in a drying oven at 70° C., stay for 60 minutes, and take it out to obtain the third interlayer.

[0032] (5) Cross-linking agent impregnation: immerse the third...

Embodiment 2

[0037] (1) Activation: immerse the polytetrafluoroethylene microporous membrane in 50% ethanol aqueous solution for 5 minutes. After draining, the active base film was obtained.

[0038] (2) Water phase immersion: immerse the active base film described in step (1) in an aqueous solution of amine monomers with a mass concentration of 1.5%, stay for 1 min, take it out and place it in the air to dry to obtain the first intermediate film;

[0039] (3) Immersion in oil phase: immerse the first intermediate film described in step (2) in the organic solvent solution of acid chloride monomers with a mass concentration of 3.0%, stay for 60s, and then place it in the air to dry to obtain the second intermediate film. Two intermediate membranes;

[0040] (4) Post-treatment: rinse the second interlayer with deionized water, then place it in a drying oven at 70° C., stay for 10 minutes, and take it out to obtain the third interlayer.

[0041] (5) Cross-linking agent impregnation: immerse...

Embodiment 3

[0046] (1) Activation: immerse the polytetrafluoroethylene microporous membrane in 50% ethanol aqueous solution for 3 minutes. After draining, the active base film was obtained.

[0047] (2) Water phase immersion: immerse the active base film described in step (1) in an aqueous solution of amine monomers with a mass concentration of 1.0%, stay for 3 minutes, take it out and place it in the air to dry to obtain the first intermediate film;

[0048] (3) Oil phase impregnation: immerse the first intermediate film described in step (2) in an organic solvent solution of acyl chloride monomers with a mass concentration of 2.0%, stay for 3 minutes, and then place it in the air to dry to obtain the second intermediate film. Two intermediate membranes;

[0049] (4) Post-treatment: rinse the second interlayer with deionized water, then place it in a drying oven at 70° C., stay for 50 minutes, and take it out to obtain the third interlayer.

[0050] (5) Crosslinking agent impregnation:...

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Abstract

The invention discloses a preparation method of a chlorine-resistant composite nanofiltration membrane. The preparation method comprises the following steps: activating a polytetrafluoroethylene microporous membrane, and carrying out water-phase impregnation, oil-phase impregnation and post-treatment to obtain the polytetrafluoroethylene composite nanofiltration membrane, and then sequentially immersing into a cross-linking agent and a grafting monomer solution to prepare the chlorine-resistant composite nanofiltration membrane. The preparation method is simple, convenient to operate and high in production repeatability, the prepared membrane has good chlorine resistance, the technical bottleneck that the performance of an existing nanofiltration membrane is reduced during chlorination treatment is well solved, and the wide application of the nanofiltration membrane is greatly promoted.

Description

technical field [0001] The invention relates to a preparation method of a composite filter membrane, in particular to a preparation method of a chlorine-resistant composite nanofiltration membrane. Background technique [0002] Nanofiltration membrane is a kind of pressure difference between ultrafiltration and reverse osmosis, with a pore size of about 1nm, which can separate monovalent salts, divalent salts or organic substances with molecular weights between 200 and 1000. Most of them use porous support layers as substrates. Membrane, based on which a composite nanofiltration membrane is covered with an active layer. Nanofiltration separation technology has the advantages of low osmotic pressure during operation, low operating pressure, low operating cost, and excellent effluent quality, and can be widely used in many fields such as sewage treatment. [0003] In the actual use of nanofiltration membranes, the raw material liquid is usually pretreated before membrane sepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D67/00B01D69/02B01D69/12B01D71/36
CPCB01D71/82B01D71/36B01D69/125B01D69/02B01D67/0093B01D2325/30
Inventor 唐红艳孙娟李愈钱光存周铭洋
Owner ZHEJIANG SCI-TECH UNIV
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