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Nanofiltration membrane, and preparation method and application thereof

A nanofiltration membrane and reaction technology, applied in the field of composite membranes, can solve the problems of increasing wastewater treatment costs, limiting the dye separation process of polyamide composite nanofiltration membranes, poor chemical and physical stability of polyamide membranes, etc. Improved hydrophilicity and high separation efficiency

Active Publication Date: 2017-05-24
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Claims
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Problems solved by technology

However, due to the hydrophobic characteristics of the material itself, its anti-pollution ability needs to be further improved.
In the literature Journal of Membrane Science, 477 (2015) 183-193, the polyamide composite membrane is used for printing and dyeing wastewater treatment, the maximum use temperature is 50°C, and the pH range used is 3-10, and the chemical properties of the polyamide membrane and poor physical stability
Considering that the actual printing and dyeing wastewater has a high temperature and a wide range of acid-base changes, it is necessary to add condensing equipment and acid-base detection and other adjustment equipment, which increases the cost of wastewater treatment and limits the use of polyamide composite nanofiltration membranes in practical applications. dye separation process

Method used

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  • Nanofiltration membrane, and preparation method and application thereof
  • Nanofiltration membrane, and preparation method and application thereof
  • Nanofiltration membrane, and preparation method and application thereof

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preparation example Construction

[0026] The embodiment of the present invention discloses a preparation method of a nanofiltration membrane, comprising the following steps:

[0027] A), mixing the polymer with a solvent and a co-solvent to obtain a polymer solution;

[0028] B), pouring the polymer solution onto the surface of the support, scraping the membrane, and performing phase inversion of the obtained nascent membrane in the coagulation bath aqueous solution to obtain a nanofiltration membrane;

[0029] The polymer is obtained by reacting an organic halide with phenolphthalein; the organic halide is selected from one or both of dichlorodiphenyl sulfone and difluorobenzophenone, or tetrafluorodiphenyl sulfone.

[0030] This application uses polyarylethersulfone (PAES-COOH, FPAES-COOH) or polyaryletherketone (PAEK-COOH) containing carboxyl groups as raw materials, and uses a non-solvent-induced phase inversion method to prepare a nanofiltration membrane. The filter membrane has good hydrophilicity and t...

Embodiment 1

[0043] Phenolphthalein (0.50mol), dichlorodiphenylsulfone or tetrafluorodiphenylsulfone or difluorobenzophenone or dichlorodiphenylsulfone+difluorobenzophenone (0.50mol), K 2 CO 3 (0.85mol), DMSO (1.5L) were added to a dry 2.0L three-neck flask filled with nitrogen atmosphere; under the protection of nitrogen, the toluene water separation reaction was carried out at 140°C for 4-6h; the toluene was evaporated and the temperature was raised to 180°C, and the reaction 12 to 24 hours; after the reaction system is cooled to room temperature, pour the mixed system into 4.5L of 10% HCl aqueous solution to obtain a fibrous polymer; collect the obtained polymer, wash with water and ether in sequence, and then vacuum-dry at 120°C After 24 hours, the target polymer was obtained with a yield greater than 95.0%. The reaction formula of the prepared polymer is as follows:

[0044]

[0045] According to the above reaction formula, it can be seen that when the reaction raw materials are ...

Embodiment 2

[0060] The nanofiltration membrane was prepared according to the method of Example 1, except that the dye solution for the corresponding flux and cut-off tests had a pH range of 5.0-7.0, and the test data results are shown in Table 1.

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Abstract

The invention provides a preparation method of a nanofiltration membrane. The method comprises the following steps: A) mixing a polymer with a solvent and a cosolvent to obtain a polymer solution; and B) pouring the polymer solution to a support surface, scraping the membrane, and carrying out phase inversion on the primary membrane in a coagulation bath water solution, wherein the polymer is prepared by carrying out reaction on organic halide and phenolphthalin, and the organic halide is selected from one or both of dichlorodiphenylsulfone and difluorodiphenylketone, or tetrafluorodiphenylsulfone. The polyether sulfone or polyaryletherketone containing carboxyl in the side chain is used as the raw material to prepare the novel hydrophilic nanofiltration membrane by the non-solvent-induced phase inversion process. The nanofiltration membrane can be used for dye-containing wastewater decolorization, dye recovery and purification and other water treatment processes. The result indicates that the nanofiltration membrane has higher separation efficiency and staining resistance for negatively charged dyes dissolved in the water body.

Description

technical field [0001] The invention relates to the technical field of composite membranes, in particular to a nanofiltration membrane, its preparation method and application. Background technique [0002] With the increasing scarcity of water resources and the aggravation of environmental problems, people's demand for efficient water treatment technology is becoming stronger and stronger. Water treatment technology based on porous separation technology has been widely used. It has provided fresh water for our daily life and industrial and agricultural production through purification of surface water, treatment of industrial wastewater and seawater desalination. Nanofiltration membrane is a kind of pressure-driven separation technology whose separation performance is between ultrafiltration membrane and reverse osmosis membrane. Molecular or polyvalent inorganic salt ions, while monovalent ions pass through selectively, the main separation mechanism is pore size sieving and...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D67/00B01D69/12C02F1/44C02F103/30
CPCB01D61/027B01D67/0016B01D69/125C02F1/442C02F2101/308C02F2103/30
Inventor 张所波柳春丽郑吉富
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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