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Preparation method of glass hollow fiber nanofiltration membrane with asymmetric pore structure

A pore structure and fiber membrane technology, applied in the field of glass hollow fiber membrane preparation, can solve the problems of decreased separation efficiency and low permeation flux, and achieve the effects of reducing permeation resistance, low permeation flux, and improving separation coefficient

Active Publication Date: 2014-04-30
天津鼎芯膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To sum up, the pore size of the glass hollow fiber membrane obtained by crystallization acid leach technology is concentrated at the nanometer level. Although the separation coefficient for gases or ions is high, the permeation flux is low, which also leads to a decline in separation efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to the following steps: (1) preparation of sodium borosilicate glass powder, (2) preparation and spinning of spinning solution, (3) drying and calcination of membrane green body, (4) corrosion preparation of hollow fiber membrane with asymmetric A glass hollow fiber nanofiltration membrane with a pore structure, wherein:

[0021] (1) Convert sodium carbonate, borax, and quartz sand into Na by mass ratio 2 O.B 2 o 3 , SiO 2 , with Na 2 O.B 2 o 3 , SiO 2The mass percentages are 7%, 31%, and 62% respectively. Weigh sodium carbonate, borax, and quartz sand, mix them by dry ball milling, pass through an 80-mesh sieve to obtain a mixture, and place the mixture in a quartz crucible. First raise the temperature of the silicon-molybdenum rod electric furnace to 1000°C, then put the crucible into the electric furnace, raise the temperature of the electric furnace to 1400°C at a heating rate of 5°C / min, and keep it for 1 hour to obtain a glass melt. Pour molten g...

Embodiment 2

[0026] According to the steps in Example 1, prepare sodium borosilicate glass powder, prepare spinning solution and spinning, dry and calcinate the green membrane and corrode the hollow fiber membrane, the difference is that sodium carbonate, borax, and quartz sand are converted according to the mass ratio into Na 2 O.B 2 o 3 , SiO 2 after Na 2 O.B 2 o 3 , SiO 2 The mass percentages are respectively 10%, 25%, and 65% of weighed sodium carbonate, borax, and quartz sand. The wet ball milling time of the soda borosilicate glass obtained after melting is 10h, and the particle size of the soda borosilicate glass powder obtained after sieving is d 50 = 5 μm. The polymer is polyvinyl chloride, the solvent is dimethyl sulfoxide, and the mass ratio of polyvinyl chloride to dimethyl sulfoxide is 12:88. Sodium borosilicate glass powder is mixed with polymer solution to obtain spinning solution, and its mass ratio is 40:60. The standing degassing time is 6 hours, the spinneret c...

Embodiment 3

[0028] According to the steps in Example 1, prepare sodium borosilicate glass powder, prepare spinning solution and spinning, dry and calcinate the green membrane and corrode the hollow fiber membrane, the difference is that sodium carbonate, borax, and quartz sand are converted according to the mass ratio into Na 2 O.B 2 o 3 , SiO 2 after Na 2 O.B 2 o 3 , SiO 2 The mass percentages are respectively 13%, 27%, and 60% of weighed sodium carbonate, borax, and quartz sand. The wet ball milling time of the soda borosilicate glass obtained after melting is 8 hours, and the particle size of the soda borosilicate glass powder obtained after sieving is d 50 = 8 μm. The polymer is polyacrylonitrile, the solvent is N,N-dimethylformamide, and the mass ratio of polyacrylonitrile to N,N-dimethylformamide is 20:80. Sodium borosilicate glass powder is mixed with polymer solution to obtain spinning solution, and its mass ratio is 50:50. The standing degassing time is 8 hours, the spi...

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Abstract

The invention relates to a preparation method of a glass hollow fiber nanofiltration membrane with an asymmetric pore structure. The method comprises the following steps: preparing sodium borosilicate glass after fusing a sodium salt A, a boron compound B and a silicon compound C, and then crushing, ball-milling and sieving to obtain sodium borosilicate glass powder; preparing a polymer solution, adding the glass powder to the polymer solution, stirring to evenly disperse, so as to obtain a spinning solution; carrying out stewing and defoaming treatment; extruding from a spinning nozzle under the pressure action of nitrogen; enabling the spinning solution to enter a coagulating bath, so as to obtain a hollow fiber membrane green body; soaking the green body into running water, so that an organic solvent is fully dissolved into water; drying the hollow fiber membrane green body and then processing by a sintering technology, so as to obtain the hollow fiber membrane green body; putting the membrane into an acid liquor to corrode, so as to obtain the glass hollow fiber nanofiltration membrane with the asymmetric pore structure. The method disclosed by the invention is simple in technology, free of expensive equipment, and low in sintering temperature, and the prepared glass hollow fiber nanofiltration membrane has the asymmetric pore structure, and can be applied to the fields such as gas separation and ion separation.

Description

technical field [0001] The invention relates to a method for preparing a glass hollow fiber membrane, in particular to a method for preparing a glass hollow fiber nanofiltration membrane with an asymmetric pore structure. Background technique [0002] Glass hollow fiber separation membrane material is an inorganic separation membrane material. As a self-supporting separation membrane material, it has the advantages of larger specific surface area and self-supporting film formation than traditional membrane materials, and it has good high temperature stability, acid corrosion resistance, easy cleaning and good mechanical stability. It can be applied It has great market potential and development space in the fields of oxygen enrichment by membrane method, separation of medium and high temperature gases, and air purification. [0003] At present, the main preparation method of glass hollow fiber membrane is crystallization acid leach technology, usually using quartz sand, bori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/04B01D69/08B01D67/00
Inventor 张亚彬曹旭苏梦玲王少迪郭鹏飞
Owner 天津鼎芯膜科技有限公司
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