Composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane, a combined technology, applied in chemical instruments and methods, membranes, membrane technology and other directions, can solve the problems of poor acid resistance and poor alkali resistance of nanofiltration membranes

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

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Problems solved by technology

[0013] The purpose of the present invention is to 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, in order to overcome the defects of existing nanofiltration membranes with poor acid resistance and alkali resistance. Application of filter membrane 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

[0034] The present invention also provides a kind of preparation method of composite nanofiltration membrane, and this method comprises the following steps:

[0035] (1) dissolving a polymer containing a hydroxyl group and a silane coupling agent containing a mercapto group in a solvent to prepare a coating solution;

[0036] (2) coating the coating solution on the support layer to form an initial film;

[0037] (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 Initial composite nanofiltration membrane;

[0038] (4) Post-treating the initial composite nanofiltration membrane with an aqueous solution containing an oxidant to obtain a modified composite nanofiltration membrane.

[0039] According to the present invention, the pres...

Embodiment 1

[0069] This embodiment is used to illustrate the composite nanofiltration membrane provided by the present invention and its preparation method.

[0070] Dissolve 1.0g of polyvinyl alcohol (PVA) and 1.0g of γ-mercaptopropyltriethoxysilane (KH580) in 100g of deionized water, then add 1mol / L dilute hydrochloric acid dropwise under stirring to adjust the pH of the solution to 1. At room temperature, after stirring for 24 hours, filter to obtain a clear coating solution;

[0071] 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; then soak the obtained initial composite nanofiltration membrane in a solution containing 100g In a solution of sulfuric acid, 10g formaldehyde and 15g sodium sulfate, at 50°C, after heating for 30min, take out the initial composite nanofiltration membrane, wash it with water and soak it in deionized water for late...

Embodiment 2

[0078] This embodiment is used to illustrate the composite nanofiltration membrane provided by the present invention and its preparation method.

[0079] Dissolve 1.0 g of PVA and 0.75 g of γ-mercaptopropyltrimethoxysilane in 100 g of deionized water, and then add 1 mol / L dilute hydrochloric acid dropwise under stirring to adjust the pH value of the solution to 4. At room temperature, after stirring for 24 hours, filter to obtain a clear coating solution;

[0080] 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; then soak the obtained initial composite nanofiltration membrane in a solution containing 100g In a solution of sulfuric acid, 15g formaldehyde and 20g sodium sulfate, at 50°C, after heating for 30min, the initial composite nanofiltration membrane was taken out, washed with water and soaked in deionized water for later use;

...

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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 obtained by forming of an initial composite nanofiltration membrane by sol-gel and thermal crosslinking reaction of a polymer containing a hydroxyl group and a silane coupling agent containing a mercapto group and then post-treatment of the initial composite nanofiltration membrane by use of a water solution containing an oxidizing agent, wherein the initial composite nanofiltration membrane is located on the surface of the support layer and is in a crosslinking net structure. The composite nanofiltration membrane may be stable to operate in a water solution of pH = 0-14, has a high salt removing rate and water permeability (water flux), also has strong acid and base resistance, 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] At present, most commercial nanofiltration membranes use polysulfone ultrafiltration membrane as the support layer, and the interfacial polymerization of polyamine aqueous phase and polyacyl chloride ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/70B01D69/12B01D67/00C02F1/44
CPCB01D69/02B01D2323/46B01D61/027B01D71/08C02F1/442B01D69/125B01D67/0006B01D67/0093B01D2325/04B01D2323/30B01D2323/21824B01D2323/21826B01D2323/21827B01D71/381B01D71/5211B01D71/702B01D71/38B01D71/52
Inventor 张杨刘轶群潘国元严昊郭敏
Owner CHINA PETROLEUM & CHEM CORP
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