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Composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and organic solvent technology, applied in the field of separation membranes, can solve the problems of poor compatibility and high cost of use, and achieve the effects of increased rejection rate, high production cost, high production efficiency and high yield

Inactive Publication Date: 2020-12-11
CHENGDU ZHIA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the use of polypyrrole nanotubes, this material is generally used in the new energy industry by virtue of its electrical conductivity. The use cost is high and its compatibility with polyethersulfone is not good, resulting in the composite nanofiltration Membrane comprehensive performance needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of preparation method of composite nanofiltration membrane is characterized in that, comprises the steps:

[0033] Step S1, disperse the amino-modified fullerene in an organic solvent, then add quaternary ammonium salt-15 and a basic catalyst therein, stir and react at 40°C for 4 hours, remove the solvent by rotary evaporation, and centrifuge wash with water for 3 times, and finally placed in a vacuum oven at 85°C and dried to constant weight to obtain an intermediate product;

[0034] Step S2, adding the intermediate product and carboxyl-terminated hyperbranched polybenzimidazole produced in step S1 into a high-boiling solvent, stirring evenly to form a mixed solution, and then adding the amino-terminated hyperbranched polybenzimidazole film to the Soak in the mixed solution for 1 hour at 50°C, then take it out and place it in a vacuum drying oven at 85°C to dry to constant weight, and then place it in a nitrogen atmosphere radiation field for radiation cross-li...

Embodiment 2

[0042] A kind of preparation method of composite nanofiltration membrane is characterized in that, comprises the steps:

[0043] Step S1, disperse the amino-modified fullerene in an organic solvent, then add quaternary ammonium salt-15 and a basic catalyst therein, stir and react at 45°C for 4.5 hours, then spin evaporate to remove the solvent, and wash with water for 4 times, and finally placed in a vacuum oven at 87°C and dried to constant weight to obtain an intermediate product;

[0044] Step S2, adding the intermediate product and carboxyl-terminated hyperbranched polybenzimidazole produced in step S1 into a high-boiling solvent, stirring evenly to form a mixed solution, and then adding the amino-terminated hyperbranched polybenzimidazole film to the Soak in the mixed solution for 1.2 hours at 52°C, then take it out and place it in a vacuum drying oven at 87°C to dry to constant weight, and then place it in a radiation field with an inert gas atmosphere to radiate and cro...

Embodiment 3

[0051] A kind of preparation method of composite nanofiltration membrane is characterized in that, comprises the steps:

[0052] Step S1, disperse the amino-modified fullerene in an organic solvent, then add quaternary ammonium salt-15 and a basic catalyst therein, stir and react at 50°C for 5 hours, remove the solvent by rotary evaporation, and centrifuge wash with water for 5 hours times, and finally placed in a vacuum oven at 90°C and dried to constant weight to obtain an intermediate product;

[0053] Step S2, adding the intermediate product and carboxyl-terminated hyperbranched polybenzimidazole produced in step S1 into a high-boiling solvent, stirring evenly to form a mixed solution, and then adding the amino-terminated hyperbranched polybenzimidazole film to the Soak in the mixed solution for 1.5 hours at 55°C, then take it out and place it in a vacuum drying oven at 90°C to dry to constant weight, then place it in a radiation field with an inert gas atmosphere for radi...

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Abstract

The invention discloses a preparation method of a composite nanofiltration membrane, which is characterized by comprising the following steps: S1, modifying amino-modified fullerene with quaternary ammonium salt 15; S2, preparing a primary product of the composite nanofiltration membrane; and S3, preparing a composite nanofiltration membrane finished product. The invention also provides the composite nanofiltration membrane prepared according to the preparation method of the composite nanofiltration membrane. The composite nanofiltration membrane disclosed by the invention is excellent in rejection rate, water flux and pollution resistance, good in mechanical property and performance stability and wide in application range.

Description

technical field [0001] The invention relates to the technical field of separation membranes, in particular to a composite nanofiltration membrane and a preparation method thereof. Background technique [0002] Nanofiltration membrane is a new type of pressure-driven membrane with selective separation characteristics between reverse osmosis membrane and ultrafiltration membrane. The membrane pore size is in the nanometer range, generally 0.7-1.5nm. Since the functional layer of the nanofiltration membrane is mostly composed of polyelectrolytes, the surface of the membrane is charged, and the rejection rates for monovalent ions, divalent ions, anions and cations are different. Therefore, nanofiltration membranes can achieve selective separation of organic compounds of different molecular weights and ions of different valence states, and have been widely used in the fields of water treatment, food industry, biochemical pharmaceuticals, fermentation and petrochemical industries....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D69/02B01D69/12B01D67/00B01D61/02
CPCB01D61/027B01D67/0006B01D69/02B01D69/12B01D71/82B01D2325/22B01D2325/24B01D2325/28B01D2325/36
Inventor 向红荣
Owner CHENGDU ZHIA TECH CO LTD
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