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Preparation method of hollow fiber composite nano-filtration membrane

A fiber composite, nanofiltration membrane technology, applied in the field of water purification, can solve the problems of complex production process of roll-type nanofiltration membrane, high production cost and use cost, low water production rate, etc., and achieve high water flux and chemical stability. performance, good desalination rate, and the effect of reducing side reactions

Inactive Publication Date: 2018-09-04
北京享云智汇科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing nanofiltration membranes are roll-type nanofiltration membranes. Roll-type nanofiltration membranes are mainly used in the material separation industry, and their water production rate per unit filling volume is also very low. The process is complicated, and its production cost and use cost are high

Method used

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  • Preparation method of hollow fiber composite nano-filtration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Mix and stir alumina ceramic powder with an average particle size of 0.3 μm, polyethersulfone, N-methylpyrrolidone, and polyvinylpyrrolidone in a mass ratio of 50%: 7.2%: 42%: 0.8%, and vacuum suction After 12 hours, the air bubbles in the film-forming liquid are removed to form a uniform and stable film-forming raw material;

[0022] (2) According to mass concentration, polyvinylphosphoric acid is 2g / L, potassium hydroxide is 2g / L polyelectrolyte preparation proteolytic alkali solution, with above-mentioned polyelectrolyte alkali solution as external coagulation bath, with water and dimethylformamide The mixed liquid with a mass concentration of dimethylformamide of 70% is used as an internal coagulation bath, and the above-mentioned hollow fiber ultrafiltration membrane spinning membrane forming system is formed by spinning through a hollow spinneret and a double diffusion process.

[0023] (3) After the above-mentioned hollow fiber ultrafiltration membrane struct...

Embodiment 2

[0025] (1) Mix and stir zirconia ceramic powder with an average particle size of 0.3 μm, polyethersulfone, N-methylpyrrolidone, and polyvinylpyrrolidone in a mass ratio of 50%: 7.2%: 42%: 0.8%, and vacuum pump Suction for 18 hours, remove the air bubbles in the film-forming liquid, and form a uniform and stable film-forming raw material;

[0026] (2) According to the mass concentration, polyvinylphosphoric acid is 1g / L, potassium hydroxide is 1g / L polyelectrolyte preparation solution alkali solution, with the above-mentioned polyelectrolyte alkali solution as the external coagulation bath, with water and dimethylformamide The mixed liquid with a mass concentration of dimethylformamide of 60% is used as an internal coagulation bath, and the above-mentioned hollow fiber ultrafiltration membrane spinning membrane forming system is formed by spinning through a hollow spinneret and a double diffusion process.

[0027] (3) After the above-mentioned hollow fiber ultrafiltration membr...

Embodiment 3

[0029] (1) Mix and stir titanium dioxide ceramic powder with an average particle size of 0.5 μm, polyethersulfone, N-methylpyrrolidone, and polyvinylpyrrolidone in a mass ratio of 50%: 7.2%: 42%: 0.8%, and vacuum pump for 18 Hours, remove the air bubbles in the film-forming liquid to form a uniform and stable film-forming raw material;

[0030] (2) According to mass concentration, polyvinylphosphoric acid is 2g / L, potassium hydroxide is 2g / L polyelectrolyte preparation proteolytic alkali solution, with above-mentioned polyelectrolyte alkali solution as external coagulation bath, with water and dimethylformamide The mixed liquid with a mass concentration of dimethylformamide of 70% is used as an internal coagulation bath, and the above-mentioned hollow fiber ultrafiltration membrane spinning membrane forming system is formed by spinning through a hollow spinneret and a double diffusion process.

[0031] (3) After the above-mentioned hollow fiber ultrafiltration membrane structu...

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Abstract

The invention relates to a preparation method of a hollow fiber composite nano-filtration membrane. According to the method, a polysulfone hollow fiber basic membrane is adopted and is subjected to dip-coating in a membrane forming solution, which takes acrylic resin, carboxyl type vinyl chloride-vinyl acetate resin and diphenylmethane diisocyanate as solutes and butyl acetate and dimethyl carbonate as solvents, to form a dense membrane, so as to prepare the hollow fiber composite nano-filtration membrane; the disadvantages that an organic hollow fiber composite nano-filtration membrane is easy to swell and has low mechanical strength, and an assembly is difficult to seal are overcome; meanwhile, the nano-filtration membrane has a good desalting rate and relatively high water flux and chemical stability, and can realize continuous industrial production.

Description

technical field [0001] The invention relates to the technical field of water purification, in particular to a preparation method of a hollow fiber composite nanofiltration membrane. Background technique [0002] In the existing household water purifiers, the reverse osmosis membrane is mainly used for filtration. Due to the characteristics of the household reverse osmosis membrane, its desalination rate is very high, so the salt content of the effluent is basically zero. At the same time, the household reverse osmosis membrane needs high pressure operation , Generally, its operating pressure needs to be 0.5MP ~ 0.7MP. Due to the effect of household reverse osmosis membranes in existing household water purifiers, its water yield is generally about 50%, so water resources are seriously wasted, and the daily water production of each household water purifier is only 50 to 100 gallons. In addition, household reverse osmosis membranes generally have a roll-type structure, their a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/08B01D69/12B01D67/00B01D61/02C02F1/44
CPCB01D61/027B01D67/0002B01D69/08B01D69/12B01D71/68C02F1/442
Inventor 于文祥
Owner 北京享云智汇科技有限公司
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