Composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and combined technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem that nanofiltration membranes do not have antibacterial properties

Active Publication Date: 2016-03-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defect that existing nanofiltration membranes do not possess antibacterial properties, and provide a composite nanofiltration membrane and a preparation method thereof, as well as the composite nanofiltration membrane and the composite nanofiltration membrane prepared by the method Application in the field of water treatment

Method used

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  • Composite nanofiltration membrane and preparation method thereof
  • Composite nanofiltration membrane and preparation method thereof
  • Composite nanofiltration membrane and preparation method thereof

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preparation example Construction

[0031] The present invention also provides a kind of preparation method of composite nanofiltration membrane, and this method comprises the following steps:

[0032] (1) dissolving a hydroxyl-containing polymer and a silane coupling agent containing a structure shown in formula (I) in a solvent to prepare a coating solution;

[0033] (2) coating the coating solution on the support layer to form an initial film;

[0034] (3) immerse the supporting layer formed with the initial film in step (2) into a solution containing a crosslinking agent and a crosslinking catalyst to carry out a crosslinking reaction to obtain a crosslinked network structure comprising the supporting layer and the surface of the supporting layer Composite nanofiltration membrane;

[0035]

[0036] Among them, Y is a linear or branched alkyl group containing C1-C20, and the end of the linear or branched alkyl group is a quaternary amine group; X is Cl, methoxy (OMe), ethoxy (OEt), OC 2 h 4 OCH 3 , OS...

Embodiment 1

[0064] This embodiment is used to illustrate the composite nanofiltration membrane provided by the present invention and its preparation method.

[0065] Dissolve 1.0g of polyvinyl alcohol (PVA), 0.8g of dimethyloctadecyl [3-(trimethoxysilyl) propyl]ammonium chloride in 100g of deionized water, and then drop into 1mol / L of dilute hydrochloric acid to adjust the pH of the solution to 1. At room temperature, after stirring for 24 hours, filter to obtain a clear coating solution;

[0066] After coating the dilute coating solution evenly on the polysulfone bottom membrane, put it into an oven at 60°C and heat it for 30 minutes to ensure that the solvent is completely evaporated; , 10 g of formaldehyde and 15 g of sodium sulfate, heated at 60° C. for 30 min, took out the composite nanofiltration membrane, washed it with water, and soaked it in deionized water.

[0067] After soaking the obtained composite nanofiltration membrane in water for 24 hours, the water flux and desalina...

Embodiment 2

[0071] This embodiment is used to illustrate the composite nanofiltration membrane provided by the present invention and its preparation method.

[0072] Dissolve 1.0 g of chitosan and 1.0 g of dimethyloctadecyl [3-(trimethoxysilyl) propyl] ammonium chloride in 100 g of deionized water, and then drop into 1 mol / L dilute hydrochloric acid to adjust the pH of the solution to 1. At room temperature, after stirring for 24 hours, filter to obtain a clear coating solution;

[0073] After coating the dilute coating solution evenly on the polysulfone bottom membrane, put it into an oven at 60°C and heat it for 30 minutes to ensure that the solvent is completely evaporated; , 10g of formaldehyde and 15g of sodium sulfate, heated at 50°C for 30min, then took out the composite nanofiltration membrane, washed it with water and soaked it in deionized water.

[0074] After soaking the obtained composite nanofiltration membrane in water for 24 hours, the water flux and desalination rate we...

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Abstract

The present invention discloses a composite nanofiltration membrane and a preparation method thereof and application of the composite nanofiltration membrane prepared by the preparation method in the field of water treatment. The composite nanofiltration membrane comprises a support layer and a separation layer which are stacked together, wherein the separation layer is a cross-linked net structure formed by dissolving of a polymer containing a hydroxyl group and a silane coupling agent containing a structure as shown in formula (I) in a solvent for sol-gel and thermal crosslinking reaction, the cross-linked net structure is located on the surface of the support layer, Y is a C2-C10 linear or branched chain alkyl group, the terminal end of the C2-C10 linear or branched chain alkyl group is quaternary ammonium group, and X is one or more of Cl, OMe, OEt, OC2H4OCH3, OSiMe3 and OAc. The composite nanofiltration membrane has a high salt removing rate and water permeability (water flux), also has strong antibacterial property, is simple in preparation method, and has great prospects for industrial application.

Description

technical field [0001] The invention relates to a composite nanofiltration membrane and a preparation method thereof. Background technique [0002] Nanofiltration is a pressure-driven membrane separation process between reverse osmosis and ultrafiltration. The pore size of the nanofiltration membrane is in the range of several nanometers. Or multivalent ions and organic matter with a molecular weight between 200 and 500 have a higher removal rate. It can be widely used in fresh water softening, seawater softening, drinking water purification, water quality improvement, oil-water separation, waste water treatment and recycling, as well as the classification, purification and concentration of chemical products such as dyes, antibiotics, polypeptides and polysaccharides. [0003] The separation characteristics of nanofiltration membranes cannot be replaced by reverse osmosis membranes and ultrafiltration membranes, and they also have the characteristics of high efficiency and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/70B01D69/12B01D67/00C02F1/44
Inventor 张杨刘轶群潘国元严昊郭敏
Owner CHINA PETROLEUM & CHEM CORP
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