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Drinking water purification composite nano-filtration membrane and preparation process thereof

A composite nanofiltration membrane and preparation process technology, applied in the field of polyethersulfone and polyurethane blending new nanofiltration membrane and preparation technology, can solve the problem of inability to retain beneficial minerals, dead end filtration, and hollow ultrafiltration membranes that cannot withstand pressure and other problems to achieve the effect of excellent separation performance

Inactive Publication Date: 2014-08-06
SHANGHAI HEALTHY WATER TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low flux of reverse osmosis membrane, power consumption, inability to retain beneficial minerals in water, dead-end filtration
The hollow ultrafiltration membrane is not resistant to pressure and high temperature, retains minerals in water, cannot remove small molecular organic matter in water, and affects the taste of water quality
Ceramic membrane has low flux and high cost

Method used

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  • Drinking water purification composite nano-filtration membrane and preparation process thereof
  • Drinking water purification composite nano-filtration membrane and preparation process thereof
  • Drinking water purification composite nano-filtration membrane and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Preparation process of spinning dope:

[0012] Take polyethersulfone and polyurethane blending ratio according to 8:2, take dimethyl sulfoxide DMSO as solvent, and take 1% by weight of Mg(ClO 4 ) 2 The solids are used as additives. After the above substances are put into dissolution, they are filtered under a pressure of 0.2MPa to remove solid impurities, and the vacuum device is used to remove air bubbles to make a membrane casting liquid, and the vacuum degree is <-0.1MPa.

[0013] Normally, the temperature of the spinning casting solution is controlled at 40°C to 60°C, and the filtration pressure is at 0.2MPa to 0.4MPa.

[0014] Spinning and post-processing technology:

[0015] Spin the prepared casting solution by dry-jet wet spinning to form a composite nanofiltration membrane for drinking water purification. After stretching, the solvent in the nascent membrane is partially volatilized to complete the pre-evaporation of the solution, and then the nascent membran...

Embodiment 2

[0018] Embodiment two: technology and flow process are with embodiment one, and concrete process parameter is as follows:

[0019] Polyethersulfone: Polyurethane=8:2

[0020] Solvent: dimethyl sulfoxide DMSO

[0021] Additive (Mg(ClO 4 ) 2 ) amount: 20%

[0022] Spinning casting solution temperature: 50°C

[0023] Filtration pressure: 0.3MPa

[0024] Vacuum degree:﹤-0.1MPa

[0025] Spinneret: concentric circle plug-in type

[0026] Salivating temperature: 45°C

[0027] Salivation chamber humidity: 65%

[0028] Solvent pre-evaporation time: 30 seconds

[0029] Coagulation bath composition: dimethyl sulfoxide DMSO aqueous solution

[0030] Coagulation bath concentration: 40%

[0031] Coagulation bath temperature: 20°C

[0032] Stretch ratio: 1.8 times

[0033] Pore ​​preserving agent: aqueous solution of ethylene glycol

[0034] Concentration: 30%

[0035]

Embodiment 3

[0037] A composite nanofiltration membrane for drinking water purification is characterized in that its cross-sectional structure is that the inner wall of the high-performance composite membrane blended with polyethersulfone and polyurethane, the membrane support layer, the dense layer and the outer wall of the membrane are sequentially connected.

[0038] The invention has the advantages that: the drinking water purification compound nanofiltration energy membrane casting solution belongs to a partially compatible system, and there is microscopic phase separation in the system. The compatibility of the blending ratio solution is better, the film forming speed is suitable, the spinning process is continuous and stable, and the film performance is the best. The prepared composite nanofiltration energy membrane for drinking water purification has the characteristics of high temperature resistance, good acid resistance, alkali resistance, good hydrophobicity, oil resistance, toug...

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Abstract

The present invention relates to the technical field of polymer material membranes, particularly to a novel drinking purification composite nano-filtration membrane. According to the method, polyether sulfone and polyurethane are adopted as main materials, and other pore forming solvents are adopted to blend, wherein through blending of polyether sulfone with polyurethane, the prepared drinking purification composite nano-filtration membrane is provided withcharacteristics of a certain complementarity, high temperature resistance, good acid resistance, good alkali resistance, good hydrophobicity, good oil resistance, toughness, wear resistance, aging resistance, high flux, uniform pore size, and nano-scale size. According to the present invention, after deep well water or municipal tap water is purified through the drinking water purification composite nano-filtration membrane, bacteria, viruses, rust, colloid, chlorine residue, ammonia, nitrogen, organic polymer compounds and other harmful substances in water can be removed, the obtained water can be directly and safely drunk, minerals, trace elements, dissolved oxygen and other beneficial substances in water are not destroyed and lost, the purified water is weakly alkaline so as to provide benefits for human body health, and the required minerals are not required to be additionally supplemented so as to provide the low production cost.

Description

technical field [0001] The invention relates to the technical field of polymer material membranes for drinking water purification, in particular to a novel nanofiltration membrane blended with polyethersulfone and polyurethane and a preparation process. Background technique [0002] At present, due to the unreasonable use of chemical fertilizers and pesticides, it not only leads to soil compaction, but also pollutes drinking water sources such as rivers, rivers, and lakes, especially the excessive discharge of harmful substances such as organic matter, ammonia, and nitrogen in industrial wastewater, causing life Serious pollution of drinking water quality. In addition, the secondary pollution of the water pipeline and the water in the pool harms the human body and seriously threatens the health of the general public. In order to further improve the quality of drinking water for the masses, membrane filtration devices currently on the market include roll-type reverse osmos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/12B01D67/00C02F1/44
Inventor 施展黄凤文任春媛施美卉
Owner SHANGHAI HEALTHY WATER TECH DEV
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