Composite nanofiltration membrane and preparation method and application thereof

A composite nanofiltration membrane and compound technology, applied in the field of separation membranes, can solve problems such as poor salt interception, and achieve the effects of simple preparation method, good salt rejection and water permeability

Active Publication Date: 2019-11-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of composite nanofiltration membrane and preparation method thereof in order to overcome the defect that existing PVA composite nanofiltration membrane has poor salt cut-off

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0048] The present invention also provides a method for preparing a composite nanofiltration membrane, characterized in that the method comprises: (1) coating a coating solution containing polyvinyl alcohol and a polymer having a carboxyl group on a support layer, so that the Polyvinyl alcohol and the polymer having a carboxyl group undergo a first crosslinking reaction to obtain a separation layer;

[0049] (2) Contacting the composite membrane obtained in step (1) with a polyphenolic compound, causing a second crosslinking reaction between the polyphenolic compound and the surface of the separation layer to obtain a surface-modified membrane.

[0050] According to the present invention, the molecular weight of polyvinyl alcohol is not particularly limited. In order to obtain higher water flux and desalination rate, preferably, the molecular weight of polyvinyl alcohol is 10000-200000, preferably 50000-10000, for example, 10000, 20000, 30000, 40000, 50000, 60000, 70000, 80000...

Embodiment 1

[0082] This embodiment is used to illustrate the composite nanofiltration membrane provided by the present invention and its preparation method.

[0083] 1.0 g of polyvinyl alcohol and 1.0 g of carboxymethyl chitosan were dissolved in 100 g of deionized water. At room temperature, after stirring for 24 hours, filter to obtain a clear coating solution; evenly coat the diluted coating solution on the polysulfone base film, and then heat it in an oven at 100°C for 30 minutes to ensure complete cross-linking; The composite nanofiltration membrane is taken out, immersed in 1% by weight of tannic acid aqueous solution, taken out after 1 min, and the composite nanofiltration membrane is soaked in deionized water for later use. The thickness of the separation layer of the composite nanofiltration membrane is 0.17 μm, and the thickness of the surface modification membrane is 0.021 μm.

Embodiment 2

[0085] This embodiment is used to illustrate the composite nanofiltration membrane provided by the present invention and its preparation method.

[0086] Dissolve 3.0 g of polyvinyl alcohol and 0.5 g of carboxymethyl cellulose in 100 g of deionized water. At room temperature, after stirring for 24 hours, filter to obtain a clarified coating solution; evenly coat the diluted coating solution on the polysulfone base film, and then heat it in an oven at 120°C for 20 minutes to ensure complete cross-linking; The composite nanofiltration membrane was taken out, immersed in a 5% by weight aqueous solution of tannic acid, taken out after 1 min, and the composite nanofiltration membrane was soaked in deionized water for later use. The thickness of the separation layer of the composite nanofiltration membrane is 0.27 μm, and the thickness of the surface modification membrane is 0.038 μm.

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Abstract

The present invention relates to the field of separation membranes, and discloses a composite nanofiltration membrane comprising a support layer and a separation layer which are sequentially laminated. One surface of the separation layer is attached to the support layer, and the other surface is subjected to surface modification with a polyphenol compound so that the polyphenol compound is crosslinked with hydroxyl in the separation layer. The separation layer is formed by crosslinking a composition comprising polyvinyl alcohol and a carboxyl-containing polymer. The composite nanofiltration membrane has excellent water permeability and salt-intercepting properties, and the preparation method is simple and has a good industrial application prospect.

Description

technical field [0001] The invention relates to the field of separation membranes, in particular to a composite nanofiltration membrane and its preparation method and application. Background technique [0002] Membrane separation technology is a new separation technology that appeared in the early 20th century and rose rapidly after the 1960s. Because membrane separation technology not only has the functions of separation, concentration, purification and refining, but also has the characteristics of high efficiency, energy saving, environmental protection, molecular level filtration, simple filtration process and easy control, it is widely used in food, medicine, biology, environmental protection, chemical industry , metallurgy, energy, petroleum, water treatment, electronics, bionics and other fields, and has produced huge economic and social benefits, and has become one of the most important means in today's separation science. [0003] The core of membrane separation tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D61/00B01D71/38
CPCB01D61/027B01D67/0006B01D69/125B01D71/38
Inventor 张杨刘轶群魏相榕潘国元周欣然
Owner CHINA PETROLEUM & CHEM CORP
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