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In-situ polymerization process for preparing polyaniline composite hyperfiltration membrane

An in-situ polymerization, polyaniline technology, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. and hydrophilic properties, easy-to-operate effect

Inactive Publication Date: 2008-10-01
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the reasons is that the molecular weight cut-off of ultrafiltration membranes produced by domestic technology is relatively large, mostly concentrated above 50,000, which cannot meet the cut-off capacity required by some applications

Method used

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  • In-situ polymerization process for preparing polyaniline composite hyperfiltration membrane
  • In-situ polymerization process for preparing polyaniline composite hyperfiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Weigh 0.35g of surfactant sodium dodecylbenzenesulfonate at a temperature of 25°C, place in 200mL of deionized water and adjust the pH to 2.3 with citric acid, then weigh 1.7mL of aniline, and add it to the above solution, Stir at 100rpm to dissolve, add 16×8cm 2 The polysulfone membrane was stirred for 4 hours, and then stirred for 2 hours at 5 °C. Then weigh 4.25g of ammonium persulfate, dissolve it in a small amount of deionized water, add it to the above solution with polysulfone membrane, stir for 10 minutes, and react at 0-5°C for 24 hours. After the reaction is completed, the polyaniline composite ultrafiltration membrane is taken out, washed with anhydrous methanol, hydrochloric acid with a mass concentration of 36%, and deionized water to obtain a finished polyaniline composite ultrafiltration membrane. The prepared polyaniline composite ultrafiltration membrane was tested at 0.16MPa, and the pure water flux was 27L / m 2 h, the rejection rate of 50ppm PEG35K a...

Embodiment 2

[0015] Weigh 0.7g of surfactant sodium dodecylbenzenesulfonate at a temperature of 25°C, place it in 200mL of deionized water and adjust the pH to 2.3 with citric acid, then weigh 3.4mL of aniline and add it to the above solution, Stir at 100rpm to dissolve, add 16×8cm 2 The polysulfone membrane was stirred for 4 hours, and then stirred for 2 hours at 5 °C. Then weigh 8.50 g of ammonium persulfate, dissolve it in a small amount of deionized water, add it to the above solution with polysulfone membrane, stir for 10 minutes, and then react at a temperature of 0-5° C. for 24 hours. After the reaction is completed, the polyaniline composite ultrafiltration membrane is taken out, washed with anhydrous methanol, hydrochloric acid with a mass concentration of 36%, and deionized water to obtain a finished polyaniline composite ultrafiltration membrane. The prepared polyaniline composite ultrafiltration membrane was tested at 0.16MPa, and the pure water flux was 17L / m 2 h, the reject...

Embodiment 3

[0017] Weigh 0.12g of surfactant sodium dodecylbenzenesulfonate at a temperature of 25°C, place it in 200mL of deionized water and adjust the pH to 2.3 with citric acid, then weigh 0.6mL of aniline, and add it to the above solution, Stir at 100rpm to dissolve, add 16×8cm 2 The polysulfone membrane was stirred for 4 hours, and then stirred for 2 hours at 5 °C. Then weigh 1.42g of ammonium persulfate, dissolve it in a small amount of deionized water, add it to the above solution with polysulfone membrane, stir for 10 minutes, and react at 0-5°C for 24 hours. After the reaction is completed, the polyaniline composite ultrafiltration membrane is taken out, washed with anhydrous methanol, hydrochloric acid with a mass concentration of 36%, and deionized water to obtain a finished polyaniline composite ultrafiltration membrane. The prepared polyaniline composite ultrafiltration membrane was tested at 0.16MPa, and the pure water flux was 46L / m 2 h, the rejection rate of 50ppm PEG35...

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Abstract

The invention discloses a method for preparing poly-aniline composite ultra-filtration film by in-situ polymerization, belonging to the preparation technique of ultra-filtration composite film. The method process comprises that under the temperature of 20 to 25 DEG C, citric acid, camphor sulfonic acid or hydrochloric acid is added into dodecyl benzene sulfonic acid sodium solution; after the pH value of the solution is adjusted, aniline is added into the solution; after the solution is uniformly mixed, polysulfone membrane is then added into the solution and the solution is then mixed for 4 to 6 hours under the temperature of 20 to 25 DEG C and then for 2 hours under the temperature of 0 to 5 DEG C; water solution of ammonium persulfate with a certain quantity is then added into the solution, and the solution is then mixed for a plurality of minutes under the temperature of 0 to 5 DEG C to complete the reaction. The finished poly-aniline composite ultra-filtration film is gained by a series of cleaning of the prepared poly-aniline composite ultra-filtration film. The method of the invention is simple and has easy operation; the surface of the prepared poly-aniline composite ultra-filtration film is densely and uniformly covered by nano-fibre-shaped polyaniline; the interception performance and the hydrophilicity performance of the poly-aniline composite ultra-filtration film are greatly improved compared with basic films and can be adjusted by controlling the film preparation reaction time.

Description

technical field [0001] The invention relates to a method for preparing polyaniline composite ultrafiltration membrane by in-situ polymerization, which belongs to the preparation technology of composite ultrafiltration membrane. Background technique [0002] Domestic research and development of ultrafiltration membranes and membrane processes began in the 1970s, and there are currently more than 100 manufacturers. The high-end fields in the domestic ultrafiltration membrane market (ultrapure water for the electronics industry, electrophoretic paint recovery, pharmaceuticals, enzyme preparations, etc.) are currently basically controlled by foreign companies. One of the reasons is that the molecular weight cut-off of ultrafiltration membranes produced by domestic technology is relatively large, mostly concentrated above 50,000, which cannot reach the cut-off capacity required by some applications. Moreover, at present domestic ultrafiltration membrane modification research is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/68B01D71/60
Inventor 王志樊智锋单毅王纪孝王世昌
Owner TIANJIN UNIV
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