Preparation method of hollow fiber nanofiltration membrane

A nanofiltration membrane and hollow technology, which is applied in the field of membrane separation, can solve the problems of adequate and uniform distribution of difficult polyamine aqueous solution, unfavorable continuous industrial production, and long preparation period of nanofiltration membrane, so as to achieve short preparation period, reduce defects, and accelerate reaction. effect of the process

Active Publication Date: 2013-04-17
ZHEJIANG JINMO ENVIRONMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the ultrafiltration membrane that has been completely cured and formed is mostly immersed in the aqueous solution of polyamine, and then fully dried after taking it out. For the hollow fiber membrane, it is difficult to effectively maintain the aqueous solution of polyamine in the membrane due to the existence of the cylindrical surface. Sufficient and uniform distribution on the surface, so that the effective components of polyamines are difficult to distribute evenly on the surface of the dried membrane filaments, so in the subsequent process of impregnating the organic solution of polyacyl chlorides, it will cause defects in the functional layer obtained by interfacial polymerization
In addition, the full drying process in the middle also leads to a long preparation cycle of nanofiltration membranes, which is not conducive to continuous industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) The hollow fiber ultrafiltration membrane spinning membrane system consists of 20% polyvinylidene fluoride, 15% polyethylene glycol with a molecular weight of 400 and 65% dimethylacetamide in terms of mass fraction.

[0026] In the polyelectrolyte alkali solution, the polymethacrylic acid is 1 g / L and the sodium hydroxide is 1 g / L in terms of mass concentration.

[0027] (2) Using the above-mentioned polyelectrolyte alkali solution as an external coagulation bath, and using a mixture of water and dimethylacetamide with a mass concentration of dimethylacetamide of 60% as an internal coagulation bath, spin the above-mentioned hollow fiber ultrafiltration membrane The silk film-forming system is formed by spinning through a hollow spinneret and a double-diffusion process, and its basic process parameters such as temperature and extrusion speed are the same as those of the prior art.

[0028] (3) After the above-mentioned hollow fiber ultrafiltration membrane structure ...

Embodiment 2

[0030] (1) The composition of the hollow fiber ultrafiltration membrane spinning membrane-forming system by mass fraction is: 15% polysulfone, 20% polyvinylpyrrolidone and 65% dimethylformamide.

[0031] In the polyelectrolyte alkali solution, the polyvinyl phosphoric acid is 2 g / L and the potassium hydroxide is 2 g / L in terms of mass concentration.

[0032] (2) Using the above-mentioned polyelectrolyte alkali solution as an external coagulation bath, and using a mixture of water and dimethylformamide with a mass concentration of dimethylformamide of 70% as an internal coagulation bath, spin the above-mentioned hollow fiber ultrafiltration membrane The silk film-forming system is formed by spinning through a hollow spinneret and a double-diffusion process, and its basic process parameters such as temperature and extrusion speed are the same as those of the prior art.

[0033] (3) After the above-mentioned hollow fiber ultrafiltration membrane structure is initially solidified,...

Embodiment 3

[0035] (1) The composition of the hollow fiber ultrafiltration membrane spinning and membrane forming system by mass fraction is: 15% polyethersulfone, 15% polyethylene glycol with a molecular weight of 600 and 70% dimethylacetamide.

[0036] In polyelectrolyte alkali solution, according to mass concentration, polyethyleneimine is 1g / L, and sodium hydroxide is 1g / L.

[0037](2) Using the above-mentioned polyelectrolyte alkali solution as an external coagulation bath, and using a mixture of water and dimethylacetamide with a mass concentration of dimethylacetamide of 60% as an internal coagulation bath, spin the above-mentioned hollow fiber ultrafiltration membrane The silk film-forming system is formed by spinning through a hollow spinneret and a double-diffusion process, and its basic process parameters such as temperature and extrusion speed are the same as those of the prior art.

[0038] (3) After the hollow fiber ultrafiltration membrane structure is initially solidified,...

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PUM

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Abstract

The invention discloses a preparation method of a hollow fiber nanofiltration membrane, and provides the preparation method of the hollow fiber nanofiltration membrane continuous in technical process, uniform in nanofiltration functional layer and few in deficiencies. The method comprises the following steps of: using polyelectrolyte aqueous alkali as an outer coagulating bath and a mixed liquor of water and a solvent for the coagulating bath as an inner coagulating bath, spinning and forming a hollow fiber nanofiltration membrane spinning and membrane forming system through a hollow spinning nozzle and a double diffusion process, and initially curing and forming a hollow fiber membrane; and adding the initially cured hollow fiber nanofiltration membrane into an aqueous liquor of polyamine, erasing the suspended liquid on the surface, adding the membrane into an organic liquor of polyacyl chloride, and drying and curing the membrane to obtain the hollow fiber nanofiltration membrane. The method provided by the invention is continuous in technical process, uniform and controllable in nanofiltration functional layer and few in defects, and has a wide prospect in the fields of seawater and brackish water desalination, treatment and recovery of sewage and wastewater, preparation of ultrapure water and the like.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a preparation method of a hollow fiber nanofiltration membrane. Background technique [0002] Membrane separation technology is widely used in material separation, purification and concentration processes. It can be operated continuously at room temperature without phase change; it has the advantages of energy saving and environmental protection in large-scale production. Nanofiltration membrane is a pressure-driven separation membrane between reverse osmosis and ultrafiltration. In application, nanofiltration membrane has two remarkable features: first, its molecular weight cut-off is between reverse osmosis membrane and ultrafiltration membrane, about 200-2000, and can intercept low molecular weight organic substances such as sugar; The functional surface layer of the nanofiltration membrane is composed of polyelectrolyte, which makes it have different rejection ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D71/34B01D71/68B01D67/00
Inventor 刘建立胡晓宇梁义
Owner ZHEJIANG JINMO ENVIRONMENT TECH CO LTD
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