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Hollow fiber composite nanofiltration membrane and preparation method thereof

A fiber composite and nanofiltration membrane technology, applied in the field of separation membranes, can solve problems such as poor pollution resistance, high water intake requirements, and easy fouling

Active Publication Date: 2016-03-16
GUANGZHOU INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the nanofiltration membrane products on the market are flat roll nanofiltration membranes with polysulfone / non-woven fabric as the support layer. The packaging process of the roll nanofiltration membrane is complicated, easy to accumulate dirt, poor pollution resistance, and high requirements for water inflow , and the driving pressure is above 0.7MPa, high energy consumption

Method used

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  • Hollow fiber composite nanofiltration membrane and preparation method thereof
  • Hollow fiber composite nanofiltration membrane and preparation method thereof
  • Hollow fiber composite nanofiltration membrane and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0022] refer to figure 1 , the preparation method of the hollow fiber composite nanofiltration membrane of an embodiment includes the following steps.

[0023] Step S100: Prepare a casting solution; wherein, the casting solution includes 15-30% film-forming material, 2-10% hydrophilic polymer, 5-20% poor solvent and 40-78% solvent.

[0024] Wherein, poor solvent (nonsolvent) refers to the solvent that can not dissolve or has poor solubility for the film-forming material in the film-casting liquid, otherwise it is a solvent that can be miscible with the film-forming material in the film-casting liquid.

[0025] In one embodiment, the step of preparing the casting solution includes: mixing the film-forming material, the hydrophilic polymer, the poor solvent and the solvent, dissolving and degassing, and obtaining the casting solution.

[0026] Preferably, the film-forming material is at least one of polyethersulfone, polysulfone, polyvinyl chloride, polyvinylidene fluoride and...

Embodiment 1

[0055] Mix 18g of polyethersulfone, 5g of sulfonated polyethersulfone, 5g of water and 72g of dimethylacetamide, stir for 24 hours to dissolve, and then stand for defoaming to obtain a uniform and transparent casting solution.

[0056] The distance of the water-entry gap of the spinneret is set to 10 cm, and the atmosphere of the water-entry gap is set to be a mixed gas of dimethyl sulfoxide steam and air, wherein the volume percentage of the air is 75%, and the relative humidity of the mixed gas is 40%. The core fluid is a 30% nitrogen methyl pyrrolidone aqueous solution at 50°C, and water at 25°C is used as the coagulant in the external coagulation bath. A hollow fiber membrane spinning machine is used, and the casting liquid is used as the shell liquid, and the shell liquid and the core liquid are extruded from the spinneret and entered into an external coagulation bath to obtain a hollow fiber ultrafiltration membrane. The hollow fiber ultrafiltration membrane was rinsed i...

Embodiment 2

[0059] Mix 15g of polyvinylidene fluoride, 10g of polyvinylpyrrolidone (K30), 20g of glycerin and 55g of nitrogen methylpyrrolidone, heat to 80°C, stir and dissolve, and defoam to obtain a casting solution.

[0060] The distance of the water entry gap of the spinneret is set to be 30cm, and the atmosphere of the water entry gap is set to be a mixed gas of dimethylacetamide steam and air, wherein the volume percentage of the air is 85%, and the relative humidity of the mixed gas is 80%. The core fluid is a 50% dimethylformamide aqueous solution at 50°C with a mass fraction of 50%, and water at 25°C is used as the coagulant in the external coagulation bath. A hollow fiber membrane spinning machine is used, and the casting liquid is used as the shell liquid, and the shell liquid and the core liquid are extruded from the spinneret and entered into an external coagulation bath to obtain a hollow fiber ultrafiltration membrane. The hollow fiber ultrafiltration membrane was rinsed in...

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Abstract

The invention relates to a preparation method for a hollow fiber composite nanofiltration membrane. The preparation method comprises the following steps: with membrane casting liquid as shell liquid, extruding the shell liquid and core liquid into an external coagulation bath from a spinning nozzle so as to obtain a hollow fiber ultrafiltration membrane, wherein the membrane casting liquid comprises, by mass, 15 to 30% of a membrane forming material, 2 to 10% of a hydrophilic polymer, 5 to 20% of a poor solvent and 40 to 78% of a solvent, a water entry gap of the spinning nozzle is 5 to 30 cm, the atmosphere of the water entry gap is air or mixed gas of air and at least one selected from the group consisting of ethanol steam, nitrogen methyl pyrrolidone steam, dimethyl acetamide steam and dimethyl sulfoxide steam, and the relative humidity of the atmosphere of the water entry gap is 30 to 80%; and preparing a separating layer on the external surface of the hollow fiber ultrafiltration membrane by using an interfacial polymerization method so as to obtain the hollow fiber composite nanofiltration membrane. The prepared hollow fiber composite nanofiltration membrane has good mechanical strength, shows good permeability at low driving pressure and is small in driving pressure and high in separation efficiency. The invention also provides the hollow fiber composite nanofiltration membrane.

Description

technical field [0001] The invention relates to the technical field of separation membranes, in particular to a hollow fiber composite nanofiltration membrane and a preparation method thereof. Background technique [0002] Membrane separation technology uses pressure as the driving force to selectively separate mixed liquids through membrane pore size and surface affinity. Compared with traditional separation methods, membrane separation technology has the advantages of high selectivity, low energy consumption, high separation efficiency and easy automation. [0003] Thermally induced phase separation (thermal method) and poor solvent induced phase separation (wet method) are two common methods for preparing separation membrane materials. Among them, the process of preparing separation membrane by wet spinning is simple, the process is flexible and controllable, and the energy consumption is low, so it is more widely used in industry. However, the separation membrane prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D71/64B01D69/12B01D67/00
Inventor 涂凯陈顺权
Owner GUANGZHOU INST OF ADVANCED TECH CHINESE ACAD OF SCI
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