Charged type chlorine containing polymer nanofiltration membrane and preparation method thereof

A polymer and nanofiltration membrane technology, applied in the field of membrane separation, can solve problems such as few research results, and achieve the effects of reducing operating costs, improving separation efficiency, and high performance

Active Publication Date: 2016-03-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research on polyvinyl chloride as a membrane separation material mostly focuses on microfiltration membranes and ultrafiltration membranes. The research in the field of nanofiltration membranes is still in its infancy, and there are few existing research results.

Method used

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  • Charged type chlorine containing polymer nanofiltration membrane and preparation method thereof
  • Charged type chlorine containing polymer nanofiltration membrane and preparation method thereof
  • Charged type chlorine containing polymer nanofiltration membrane and preparation method thereof

Examples

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preparation example Construction

[0048] The preparation method of the charged chlorine-containing polymer nanofiltration membrane comprises the following steps:

[0049] 1) Uniformly coating the polyamine compound aqueous solution on the surface of the chlorine-containing polymer ultrafiltration membrane, and then performing the first heat treatment on the ultrafiltration membrane;

[0050] 2) Washing the ultrafiltration membrane treated in step 1) and immersing it in a mixed solution of a crosslinking agent and a charging reagent, and performing a second heat treatment to obtain a charged chlorine-containing polymer nanofiltration membrane.

[0051] Preferably, the polyamine compound in step 1) is selected from any one or more of tetraethylenepentamine, triethylenetetramine, polyethylene polyamine, and polyethyleneimine, and the polyamine compound solution is 10% by mass ~50% aqueous solution.

[0052] As a preference, the material of the chlorine-containing polymer ultrafiltration membrane described in ste...

Embodiment 1

[0060] A 15% polyethyleneimine (PEI) aqueous solution was coated on a flat polyvinyl chloride (PVC) ultrafiltration membrane, and rinsed with deionized water after the first heat treatment at 60°C for 10 hours. Then the film was immersed in 10% glutaraldehyde and 10% methacryloyloxyethyltrimethylammonium chloride (EPTAC) aqueous solution at 60°C for the second time. After heat treatment for 1 hour, a positively charged low-pressure high-flux PVC / PEI polymer nanofiltration membrane is obtained.

[0061] attached image 3 Infrared reflection spectra of the surface before and after film treatment. Compared with the PVC support layer M0, M3 after depositing the PEI layer and crosslinking with glutaraldehyde, at 3377cm -1 and 1035cm -1 Two new absorption peaks appear, corresponding to -NH of PEI 2 and -C-N- single-bond stretching vibrations, indicating the stable existence of the PEI layer; at 1546cm -1 The new absorption peak at is the C=N stretching vibration peak of the Sch...

Embodiment 2

[0073] A 40% triethylenetetramine aqueous solution was coated on a chlorinated polyethylene flat ultrafiltration membrane, and after the first heat treatment at 80°C for 2 hours, it was rinsed with deionized water. Then soak the film in 0.1% by mass percentage of dicyclopentadiene epoxide and 8% by mass of 1,3-propane sultone ethanol solution, at 50°C for the second time After heat treatment for 10 hours, a negatively charged low-pressure high-flux chlorinated polyethylene / triethylenetetramine polymer nanofiltration membrane is obtained.

[0074] Under the test conditions of 25°C and 0.3MPa, the pure water flux of the prepared charged chlorine-containing polymer nanofiltration membrane is 61.9L / (m 2 h), the rejection rate of 0.01mol / L sodium sulfate is 90.1%, the rejection rate of 0.01mol / L sodium chloride is 42.1%, and the rejection rate of Congo red is 99.9%. The membrane is placed at 60°C for deionization The flux and interception performance remained unchanged when the wa...

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Abstract

The invention discloses a charged type chlorine containing polymer nanofiltration membrane and a preparation method thereof. The nanofiltration membrane is composed of a macroporous supporting layer and a dense functional layer. The macroporous supporting layer and the dense functional layer are connected through a C-N bond, the dense functional layer is a positive or charged or zwitterionic crosslinking multivariate amine compound, and the macroporous supporting layer is prepared from chlorine containing polymer. The preparation method of the nanofiltration membrane comprises the steps that a multivariate amine compound is smeared to the surface of a chlorine containing polymer ultrafiltration membrane, thermal treatment is carried out, the chlorine containing polymer ultrafiltration membrane is soaked in a crosslinking agent and charged reagent mixed solution after being washed, and thermal treatment is carried out again. The membrane flux of the prepared polymer nanofiltration membrane can reach 60 L / m<2>.h at the pressure of 0.3 MPa, and the reject rate of micromolecule dyes and high-valent inorganic salt can reach 90%. The chlorine containing polymer nanofiltration membrane comprises a slab ultrafiltration membrane state and a hollow fiber ultrafiltration membrane sate, and good practical prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a charged chlorine-containing polymer nanofiltration membrane and a preparation method thereof. Background technique [0002] Membrane separation technology has the advantages of high separation efficiency, easy operation, and low energy consumption, and has become one of the most important means in today's separation science. Nanofiltration is a separation technology with a separation capacity between ultrafiltration and reverse osmosis. The molecular weight cut-off is between 200-2000, and the membrane pore size is about 1nm. It can operate under low pressure and requires low equipment. It is used in the food industry and wastewater treatment. , oil exploration, pharmaceuticals and other fields have broad application prospects. [0003] At present, there are two main preparation methods for commercial nanofiltration membranes. One is interfacial polymer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/30B01D69/12B01D69/02B01D67/00
Inventor 朱宝库崔月许云秋姚之侃杜世媛孔新朱利平
Owner ZHEJIANG UNIV
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