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Preparation method for hollow fiber composite nanofiltration membrane

A fiber composite and nanofiltration membrane technology, applied in the field of membrane separation, can solve the problems of narrow working temperature range, poor corrosion resistance, poor mechanical strength, etc., achieve good desalination rate, compensate for easy swelling, and have wide application prospects

Inactive Publication Date: 2017-01-04
李祥庆
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, organic membranes also have shortcomings such as easy swelling, poor mechanical strength, narrow working temperature range, and poor corrosion resistance, which limit their application to a certain extent.

Method used

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  • Preparation method for hollow fiber composite nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Mix ceramic powder, high molecular polymer, organic solvent and dispersant at a mass ratio of 50%: 7.5%: 42%: 0.5% and stir evenly. After defoaming for 24 hours, pass through a hollow chamber under a driving pressure of 0.1MPa. The fiber spinneret is sprayed out, the flow rate of the core liquid is 40ml / min, the space between the air sections is 10cm, and after drying at room temperature, it is sintered at a high temperature of 1550°C to obtain a hollow fiber ceramic support body.

[0016] (2) Mix and stir sulfonated polyethersulfone, film-forming solvent, and additives at a mass ratio of 10%: 60%: 30% evenly, seal both ends of the hollow fiber ceramic support with raw material tape and immerse vertically in the above-mentioned Stay in the homogeneous solution for 10s, take out the air flow to sweep the surface liquid film layer, repeat three times, and finally place in deionized water to fully remove the solvent, dry in an oven to obtain a hollow fiber composite mem...

Embodiment 2

[0018] (1) Mix ceramic powder, high molecular polymer, organic solvent and dispersant at a mass ratio of 50%: 7.5%: 42%: 0.5% and stir evenly. After defoaming for 24 hours, pass through a hollow chamber under a driving pressure of 0.1MPa. The fiber spinneret is sprayed out, the flow rate of the core liquid is 40ml / min, the space between the air sections is 10cm, and after drying at room temperature, it is sintered at a high temperature of 1550°C to obtain a hollow fiber ceramic support body.

[0019] (2) Mix and stir sulfonated polyethersulfone, film-forming solvent, and additives at a mass ratio of 12%:55%:33% evenly, seal both ends of the hollow fiber ceramic support with raw material tape, and immerse vertically in the above-mentioned Stay in the homogeneous solution for 10s, take out the air flow to sweep the surface liquid film layer, repeat three times, and finally place in deionized water to fully remove the solvent, dry in an oven to obtain a hollow fiber composite memb...

Embodiment 3

[0021] (1) Mix ceramic powder, high molecular polymer, organic solvent and dispersant at a mass ratio of 50%: 7.5%: 42%: 0.5% and stir evenly. After defoaming for 24 hours, pass through a hollow chamber under a driving pressure of 0.1MPa. The fiber spinneret is sprayed out, the flow rate of the core liquid is 40ml / min, the space between the air sections is 10cm, and after drying at room temperature, it is sintered at a high temperature of 1550°C to obtain a hollow fiber ceramic support body.

[0022] (2) Mix and stir sulfonated polyethersulfone, film-forming solvent, and additives at a mass ratio of 14%:52%:34% evenly, seal both ends of the hollow fiber ceramic support with raw material tape, and then immerse vertically in the above-mentioned Stay in the homogeneous solution for 10s, take out the air flow to sweep the surface liquid film layer, repeat three times, and finally place in deionized water to fully remove the solvent, dry in an oven to obtain a hollow fiber composite...

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Abstract

The invention relates to a preparation method for a hollow fiber composite nanofiltration membrane. The method comprises the following steps: (Step 1) ceramic powder, macromoleclar polymer, organic solvent and dispersing agent are mixed according to certain proportions and agitated, so that uniform and stable membrane-casting solution is produced, air bubbles in the membrane-casting solution are removed by vacuum suction, and the membrane-casting solution is sprayed out via a hollow fiber spinneret under the drive of pressure, and is shaped under certain core liquid flow velocity and air section distance conditions to get into external gel bath; after being aired under normal temperature, the phase-inversed raw hollow fiber is sintered under high temperature, and thereby a hollow fiber ceramic support is obtained; (Step 2) sulfonated polyethersulfone, membrane-forming solvent and additive are mixed according to certain proportions and agitated, so that homogeneous solution is produced, the hollow fiber ceramic support is immersed in the homogeneous solution in a certain way for a period of time and airflow is adopted to blow off the thick liquid membrane layer of the surface of the support after the hollow fiber ceramic support is taken out, which are repeated for multiple times, the hollow fiber ceramic support is finally put into deionized water to sufficiently remove the solvent, and is dried under a certain temperature in an oven, and thereby the hollow fiber composite nanofiltration membrane is obtained. The preparation method for the hollow fiber composite nanofiltration membrane disclosed by the invention has the advantages of high chemical and thermal stability and high mechanical strength.

Description

technical field [0001] The invention relates to a preparation method of a hollow fiber composite nanofiltration membrane. It belongs to the technical field of membrane separation. Background technique [0002] Membrane separation technology is an emerging separation technology. Separation membrane is the core component of this technology's success or failure, and it is also the direction and focus of this technology's research and development. The systematic research on the separation membrane phenomenon can be traced back to the eighteenth century. In 1748, Abbe Noletf observed that water can spontaneously pass through the bladder of a pig into an aqueous alcohol solution, and then he invented the word "Osmosis" to reveal the phenomenon of membrane separation. However, it was not until 1960 that Leob and Sourirajan prepared defect-free, high-throughput heterogeneous separation membranes through phase inversion, and membrane separation technology was widely used. The inve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/02B01D69/12B01D67/00
CPCB01D71/68B01D67/0013B01D67/0095B01D69/12B01D71/02
Inventor 李祥庆朱士洪李文忠孙琦沈凯华任斌彬
Owner 李祥庆
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