A kind of hollow fiber nanofiltration membrane and preparation method thereof

A nanofiltration membrane and fiber technology, applied in the field of hollow fiber nanofiltration membrane and its preparation, can solve the problems of poor backwash resistance and oxidation resistance, and achieve the effect of high selective separation performance

Active Publication Date: 2017-11-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a hollow fiber nanofiltration membrane and a preparation method thereof for the problems that existing nanofiltration membranes have poor backwash resistance and oxidation resistance. The prepared hollow fiber nanofiltration membrane has high Strength, backwash resistance, oxidation resistance and high selective separation performance

Method used

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  • A kind of hollow fiber nanofiltration membrane and preparation method thereof
  • A kind of hollow fiber nanofiltration membrane and preparation method thereof
  • A kind of hollow fiber nanofiltration membrane and preparation method thereof

Examples

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Effect test

Embodiment 1

[0034] Polysulfone, tributyl phosphate and cetyl alcohol are used as the outer layer casting solution, and its components are 28wt.% by mass of polysulfone, 36wt.% by mass of tributyl phosphate, and 36wt.% by mass of cetyl alcohol. .%, with polypropylene, tributyl phosphate and lauryl alcohol as the inner layer casting solution, its components are 32wt.% by mass of polypropylene, 58wt.% by mass of tributyl phosphate, and cetyl alcohol by mass The percentage is 10wt.%, respectively added to a co-rotating twin-screw extruder for dissolution and defoaming to obtain a homogeneous casting solution. The polymer homogeneous casting solution is injected into the outer gel medium through the hollow fiber spinneret through the melt pump and the inner gel medium at the same time to solidify to obtain as-spun filaments. The diluent in the as-spun silk is removed by using an extractant to obtain a hollow fiber nanofiltration membrane. The detailed preparation parameters and the structure ...

Embodiment 2

[0036] Polyethersulfone, methyl salicylate and triethylene glycol are used as the outer casting solution, and its components are 24wt.% by mass of polyethersulfone, 71wt.% by mass of methyl salicylate, triethylene glycol Glycol mass percent is 5wt.%, polysulfone, methyl salicylate and ethylene glycol are used as inner layer casting liquid, and its component is that polysulfone mass percent is 28wt.%, and methyl salicylate mass percent is 62wt.%, ethylene glycol mass percentage is 10wt.%, respectively added to the co-rotating twin-screw extruder for dissolution and defoaming to obtain a homogeneous casting solution. The polymer homogeneous casting solution is injected into the outer gel medium through the hollow fiber spinneret through the melt pump and the inner gel medium at the same time to solidify to obtain as-spun filaments. The diluent in the as-spun silk is removed by using an extractant to obtain a hollow fiber nanofiltration membrane. The detailed preparation paramet...

Embodiment 3

[0038] Sulfonated polysulfone, trioctyl phosphate and triethylene glycol are used as the outer layer casting solution, and its components are 20wt.% by mass of sulfonated polysulfone, 75wt.% by mass of trioctyl phosphate, triethylene glycol The mass percentage of diol is 5wt.%, and polyethersulfone, trioctyl phosphate and diethylene glycol are used as the inner layer casting solution, and its components are 32wt.% of polysulfone, and methyl salicylate. 64wt.%, ethylene glycol mass percentage is 4wt.%, respectively added to the co-rotating twin-screw extruder for dissolution and defoaming, to obtain a homogeneous casting solution. The polymer homogeneous casting solution is injected into the outer gel medium through the hollow fiber spinneret through the melt pump and the inner gel medium at the same time to solidify to obtain as-spun filaments. The diluent in the as-spun silk is removed by using an extractant to obtain a hollow fiber nanofiltration membrane. The detailed prep...

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Abstract

A hollow fiber nanofiltration membrane and a preparation method thereof. The nanofiltration membrane is composed of an inner layer of a polymer material, an outer layer of a polymer material, and an intermediate transition layer in which molecular chains of the inner layer and the outer polymer material are intertwined. The preparation method is that the inner layer polymer material and the outer layer polymer material are dissolved in a high-temperature diluent, and two co-rotating twin-screw extruders and three-channel spinnerets are used; the method of phase separation induced by temperature or solvent exchange is one step The inner layer of the bicontinuous pore structure and the outer layer of the nanoporous structure are obtained, that is, the hollow fiber nanofiltration membrane is obtained. The invention has the characteristics of high strength, backwash resistance, high selective separation performance and the like.

Description

technical field [0001] The invention relates to a hollow fiber nanofiltration membrane with backwash resistance, oxidation resistance and high selective separation and a preparation method thereof. Background technique [0002] The research and development of hollow fiber nanofiltration membrane is expected to lead the future of membrane technology. At present, the nanofiltration membrane is still mainly a composite roll membrane, but in the patents reported so far, the oxidation resistance and chlorine resistance of the composite nanofiltration membrane are very poor, and there will be problems of performance attenuation and lifespan reduction in long-term use. The hollow fiber nanofiltration membrane can realize the backwash of the oxidative cleaning agent, and the hollow fiber membrane can be made very thin, so that the hollow fiber membrane after being assembled into a module has a high packing density, and the effective filtration area of ​​the nanofiltration membrane i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D71/16B01D71/32B01D71/26B01D71/30B01D69/08B01D67/00
Inventor 王晓琳刘天印庞博周波袁浩歌刘圆圆林亚凯
Owner TSINGHUA UNIV
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