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Preparation method for composite nanofiltration membrane based on polyether sulfone hollow fiber ultrafiltration membrane

A composite nanofiltration membrane and ultrafiltration membrane technology, applied in the field of ultrafiltration membranes, can solve the problems of strong surface hydrophobicity, shortened service life, and reduced membrane performance, and achieve strong anti-pollution ability, strong hydrophilicity, and performance stable effect

Inactive Publication Date: 2021-08-27
徐州禹慧环境科技研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some shortcomings: the surface is highly hydrophobic, and it is easy to form a membrane fouling layer, which reduces the performance of the membrane and shortens the service life.

Method used

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  • Preparation method for composite nanofiltration membrane based on polyether sulfone hollow fiber ultrafiltration membrane
  • Preparation method for composite nanofiltration membrane based on polyether sulfone hollow fiber ultrafiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of a composite nanofiltration membrane based on a polyethersulfone hollow fiber ultrafiltration membrane, comprising the following steps,

[0027] S1: Preparation of hollow fiber ultrafiltration membrane with polyethersulfone as the main substrate;

[0028] S11: Preparation of casting solution,

[0029] Put 18 parts of polyethersulfone, 30 parts of water, 2 parts of polyethylene glycol and 50 parts of dimethylformamide in a dissolution tank, set the temperature at 50°C, and rotate at 100 r / min, stir and dissolve for 24 hours, then cool down After reaching 25°C, under the pressure of -0.09~-0.08MPa, after vacuum degassing for 12 hours, the casting solution was obtained;

[0030] S12: Preparation of core fluid,

[0031] Put 80 parts of dimethylformamide and 30 parts of water in a stirred tank, stir and mix at room temperature for 4 hours at a rotation speed of 100 r / min, and vacuum defoam for 4 hours at a pressure of -0.05 MPa to obtain a core liqui...

Embodiment 2

[0041] A preparation method of a composite nanofiltration membrane based on a polyethersulfone hollow fiber ultrafiltration membrane, comprising the following steps,

[0042] S1: Preparation of hollow fiber ultrafiltration membrane with polyethersulfone as the main substrate;

[0043] S11: Preparation of casting solution,

[0044] Put 18 parts of polyethersulfone, 30 parts of water, 2 parts of polyethylene glycol and 50 parts of dimethylformamide in a dissolution tank, set the temperature at 50°C, and rotate at 100 r / min, stir and dissolve for 24 hours, then cool down After reaching 25°C, under the pressure of -0.09~-0.08MPa, after vacuum degassing for 12 hours, the casting solution was obtained;

[0045] S12: Preparation of core fluid,

[0046] Put 80 parts of dimethylformamide and 30 parts of water in a stirred tank, stir and mix at room temperature for 4 hours at a rotation speed of 100 r / min, and vacuum defoam for 4 hours at a pressure of -0.05 MPa to obtain a core liqui...

Embodiment 3

[0056] A preparation method of a composite nanofiltration membrane based on a polyethersulfone hollow fiber ultrafiltration membrane, comprising the following steps,

[0057]S1: Preparation of hollow fiber ultrafiltration membrane with polyethersulfone as the main substrate;

[0058] S11: Preparation of casting solution,

[0059] Put 18 parts of polyethersulfone, 30 parts of water, 2 parts of polyethylene glycol and 50 parts of dimethylformamide in a dissolution tank, set the temperature at 50°C, and rotate at 100 r / min, stir and dissolve for 24 hours, then cool down After reaching 25°C, under the pressure of -0.09~-0.08MPa, after vacuum degassing for 12 hours, the casting solution was obtained;

[0060] S12: Preparation of core fluid,

[0061] Put 80 parts of dimethylformamide and 30 parts of water in a stirred tank, stir and mix at room temperature for 4 hours at a rotation speed of 100 r / min, and vacuum defoam for 4 hours at a pressure of -0.05 MPa to obtain a core liquid...

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Abstract

The invention belongs to the technical field of ultrafiltration membranes, and particularly relates to a preparation method for a composite nanofiltration membrane based on a polyethersulfone hollow fiber ultrafiltration membrane. The preparation method is characterized by comprising the following steps: S1, preparation of a hollow fiber ultrafiltration membrane with polyethersulfone as a main base material: S11, preparing a membrane casting solution; S12, preparing a core solution; and S13, preparing a hollow fiber base membrane; and S2, sulfonation treatment of the ultrafiltration membrane: S21, preparing a mixed aqueous solution of sulfuric acid and acetic acid and conducting uniform stirring; S22, putting the hollow fiber ultrafiltration membrane obtained in S13 into a reaction tank, injecting a prepared sulfuric acid mixed solution, and conducting soaking for 8-48 hours; S23, after soaking is completed, discharging the sulfuric acid mixed solution, adding sodium hydroxide with a concentration of 1 M to clean membrane filaments, and conducting soaking for 24 hours; S24, cleaning and soaking the membrane filaments with reverse osmosis water for 24 hours; and S25, taking out the membrane filaments, soaking the membrane filaments in a glycerol solution with a concentration of 30-50% for 8-24 hours, and airing the membrane filaments in the air to obtain the composite nanofiltration membrane.

Description

technical field [0001] The invention belongs to the technical field of ultrafiltration membranes, and in particular relates to a preparation method of a composite nanofiltration membrane based on a polyethersulfone hollow fiber ultrafiltration membrane. Background technique [0002] Over the past ten years, low-pressure membrane technology (ultrafiltration and microfiltration) technology has achieved considerable development and wide application. Because of its simple equipment, small footprint, constant phase state, low operating pressure, low material requirements, and simple equipment, its application range has also rapidly extended from the research field to practical application fields, such as electronics, medicine, and electrophoretic paint. , beverage, food chemical, medical and wastewater treatment and recycling, etc. At present, new membrane materials are being developed, and high-performance membrane material modification solutions are sought to obtain better per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/12B01D69/08B01D67/00B01D61/02
CPCB01D61/027B01D67/0011B01D69/08B01D69/12B01D71/68
Inventor 魏晞宋岩伟鲍士彪
Owner 徐州禹慧环境科技研究院有限公司