Preparation method of high flux loose hollow fiber nanofiltration membrane

A high-flux, nanofiltration membrane technology, applied in the field of filtration membranes, can solve the problems of limited permeation performance improvement of nanofiltration membranes, poor organic/inorganic interface compatibility, and defects in ultra-thin separation layers. Poor tolerance, accelerated interfacial polymer process, effect of reducing defects

Active Publication Date: 2022-04-19
NINGBO FOTILE KITCHEN WARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The traditional nanoparticle filling method has problems such as insufficient dispersion and poor compatibility at the organic / inorganic interface, which lead to defects in the ultra-thin separation layer and reduced retention performance
Since the presence of nanoparticles creates a certain resistance to the penetration of water molecules, the improvement of the permeability of nanofiltration membranes by filling nanoparticles is limited.

Method used

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  • Preparation method of high flux loose hollow fiber nanofiltration membrane
  • Preparation method of high flux loose hollow fiber nanofiltration membrane
  • Preparation method of high flux loose hollow fiber nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Film-making environmental conditions: temperature 25±3°C, humidity 45%±5.

[0032] (1) Weigh 0.0169g of silver nitrate and dissolve it in 100ml of deionized water, then add 0.6g of ethylenediamine dropwise to the silver nitrate solution, and stir to obtain an aqueous phase solution;

[0033] (2) Soak the polysulfone hollow fiber ultrafiltration membrane in the prepared aqueous phase solution, soak for 1min, and dry the residual solution on the surface of the ultrafiltration membrane with filter paper after taking it out;

[0034] (3) Weigh 0.01g of trimesoyl chloride and dissolve it in 100ml of n-hexane to obtain an oil phase solution, soak the hollow fiber ultrafiltration membrane obtained in step (2) into the oil phase solution, take it out after reacting for 15s, and place it in an oven , at 50°C for 10s;

[0035] (4) Take 1g of ammonium carbonate and dissolve it in 100ml deionized water, take out the membrane obtained in step (3) after soaking in ammonium carbonate...

Embodiment 2

[0039] Film-making environmental conditions: temperature 25±3°C, humidity 45%±5.

[0040] (1) Take 0.204g of silver perchlorate and dissolve it in 100ml of deionized water, then add 3g of ethylenediamine dropwise to the silver perchlorate solution, and stir to obtain an aqueous phase solution;

[0041] (2) Soak the polyethersulfone hollow fiber ultrafiltration membrane in the prepared aqueous phase solution, soak for 5min, and dry the residual solution on the surface of the ultrafiltration membrane with filter paper after taking it out;

[0042] (3) Take by weighing 0.1g terephthaloyl chloride and dissolve in 100ml n-heptane to obtain an oil phase solution, soak the hollow fiber ultrafiltration membrane obtained in step (2) into the oil phase solution, take it out after reacting for 60s, and place In an oven, process at 80°C for 50s;

[0043] (4) Weigh 5 g of sodium thiosulfate and dissolve it in 100 ml of deionized water, soak the membrane obtained in step (3) in sodium thio...

Embodiment 3

[0047] Film-making environmental conditions: temperature 25±3°C, humidity 45%±5.

[0048] (1) Take 0.485g of silver perchlorate and dissolve it in 100ml of deionized water, then add 3g of ethylenediamine dropwise to the silver perchlorate solution, and stir to obtain an aqueous phase solution;

[0049] (2) Soak the polyvinyl chloride hollow fiber ultrafiltration membrane in the prepared aqueous phase solution, soak for 10min, and dry the residual solution on the surface of the ultrafiltration membrane with filter paper after taking it out;

[0050] (3) Weigh 1g of isophthaloyl chloride and dissolve it in 100ml cyclohexane to obtain an oil phase solution, soak the hollow fiber ultrafiltration membrane obtained in step (2) into the oil phase solution, take it out after reacting for 120s, and place In an oven, process at 120°C for 120s;

[0051] (4) Weigh 10 g of potassium thiocyanate and dissolve it in 100 ml of deionized water, soak the membrane obtained in step (3) in potassium...

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Abstract

A method for preparing a high-flux loose hollow fiber nanofiltration membrane, comprising the following steps: 1. dissolving a metallic silver salt in water to prepare a metallic silver salt solution, and then adding ethylenediamine to the metallic silver salt solution, Stir to obtain a uniform aqueous solution; 2. soak the hollow fiber ultrafiltration membrane in the aqueous solution prepared above, take it out after soaking, and remove the residual solution on the surface of the hollow fiber ultrafiltration membrane; 3. soak the hollow fiber ultrafiltration membrane obtained in step 2. Immerse in the prepared oil phase solution, and carry out interfacial polymerization reaction on the surface of the hollow fiber membrane; ④ take out the hollow fiber ultrafiltration membrane obtained in step ③ from the oil phase, dry it, and then soak it in a salt solution to remove it and then clean it with pure water A hollow fiber nanofiltration membrane was obtained. The silver chloride nanoparticles in the present invention can be uniformly distributed in the ultra-thin separation layer by in-situ production, and the holes formed after the nanoparticles are dissolved can greatly improve the flux while ensuring the interception performance of the nanofiltration membrane.

Description

technical field [0001] The invention relates to a filter membrane, in particular to a preparation method of a nanofiltration membrane. It belongs to the field of filter membrane technology. Background technique [0002] The interfacial polymerization method is currently the most common method for preparing nanofiltration membranes. Its basic principle is to form a thin-layer composite nanofiltration membrane by forming an ultra-thin separation layer with nanoscale pore size on the surface of the ultrafiltration base membrane. The performance is mainly determined by the pore structure and surface properties of the ultrathin separation layer. For related documents, please refer to the Chinese invention patent application publication with application number 201310026899.X "A Method for Preparing Composite Nanofiltration Membrane by Interfacial Polymerization" (application publication number: CN103933881A), and the Chinese invention patent application publication with applicati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D71/30B01D67/00B01D61/02
CPCB01D71/68B01D71/30B01D61/027B01D67/0002
Inventor 林春儿胡帆陈承刘戈
Owner NINGBO FOTILE KITCHEN WARE CO LTD
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