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Modified polyacrylonitrile ultra-filtration membrane, preparation method and application

A polyacrylonitrile and ultrafiltration membrane technology, which is applied in ultrafiltration, chemical instruments and methods, and membranes, can solve the problems of low internal structure order and regularity, affecting membrane water flux, and low service life. , to achieve the effect of improving anti-pollution performance, improving hydrophilicity and optimizing overall performance

Inactive Publication Date: 2021-05-07
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main defect of the existing PAN ultrafiltration membrane is that the hydrophilicity is limited, which affects the water flux of the membrane, and because the order and regularity of its internal structure are not high, and the pore size distribution is wide, making it difficult to use for a period of time. Afterwards, the pores inside the membrane are easily blocked by sediments. Therefore, it is necessary to use sodium hypochlorite aqueous solution to wash the membranes to remove the clogged sediments, and PVDF ultrafiltration membranes and PAN ultrafiltration membranes are much weaker in resistance to sodium hypochlorite. After a small number of times, the membrane will become brittle and other problems, resulting in the durability of the PAN ultrafiltration membrane is not as good as the PVDF membrane, and the service life is much lower than that of the PVDF membrane.

Method used

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  • Modified polyacrylonitrile ultra-filtration membrane, preparation method and application
  • Modified polyacrylonitrile ultra-filtration membrane, preparation method and application
  • Modified polyacrylonitrile ultra-filtration membrane, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Weigh 255g of N-N dimethylformamide and 45g of polyacrylonitrile, pour N-N dimethylformamide into a three-necked flask, add the rotor, slowly add polyacrylonitrile while stirring, and continue stirring until the polyacrylonitrile Nitrile is completely dissolved;

[0035] (2) Weigh 10.8g of ammonium chloride and 11.7g of sodium azide, add ammonium chloride and sodium azide in the three-necked flask successively, place the three-necked flask in the oil bath, and set the temperature of the oil bath to When the temperature is 120°C, one port is plugged with a plug, and the other port is sealed with a balloon. When the temperature rises to 120°C, stir for another 30 minutes, then leave the oil bath for 1.5 hours, and cool to 40°C;

[0036] (3) Measure 60 mL of hydrochloric acid and 550 mL of deionized water (excessive hydrochloric acid), pour the deionized water into a 1000 mL beaker, pour in the hydrochloric acid while stirring, and prepare a mixed solution;

[0037] (...

Embodiment 2

[0040]Weigh 56.6g of N-N dimethylformamide, 10g of polyacrylonitrile-grafted tetrazole prepared in Example 1, pour N-N dimethylformamide into a three-necked flask, add the rotor to stir, and then add the mixture prepared in Example 1 The polyacrylonitrile-grafted tetrazole, continue to stir until dissolved. Weigh 3.2 g of potassium carbonate, slowly add it to the above-mentioned three-necked flask, stopper one end tightly, and seal the other end with a balloon, put the three-necked flask into an oil bath, set the temperature of the oil bath to 60°C, and stir for about 2 hours. Weigh 3.33 mL of ethyl iodide, pour ethyl iodide into a three-necked flask, stir for 24 hours, and cool to 40°C. Slowly pour the mixed solution prepared in step (3) of Example 1 into the three-necked flask. Do not pour it too quickly, otherwise a 'bun' will be formed. Stir while pouring. After the poured solution is precipitated, repeat the above process until all precipitated. If the solution no longe...

Embodiment 3

[0042] Weigh 56.6g of N-N dimethylformamide, 10g of polyacrylonitrile-grafted tetrazole prepared in Example 1, pour N-N dimethylformamide into a three-necked flask, add the rotor to stir, and then add the mixture prepared in Example 1 The polyacrylonitrile-grafted tetrazole, continue to stir until dissolved. Weigh 3.2 g of potassium carbonate, slowly add it to the above-mentioned three-necked flask, stopper one end tightly, and seal the other end with a balloon, put the three-necked flask into an oil bath, set the temperature of the oil bath to 60°C, and stir for about 2 hours. Weigh 3.33 g of iodoacetic acid, pour the iodoacetic acid into a three-necked flask, stir for 24 hours, and cool to 40°C. Slowly pour the mixed solution prepared in step (3) of Example 1 into the three-necked flask. Do not pour it too quickly, otherwise a 'bun' will be formed. Stir while pouring. After the poured solution is precipitated, repeat the above process until all precipitated. If the solutio...

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Abstract

The invention discloses a modified polyacrylonitrile ultra-filtration membrane, a preparation method and application, and belongs to the technical field of membrane preparation, the preparation method comprises the following steps: firstly preparing tetrazole grafted polyacrylonitrile, then grafting iodoethane, iodoacetic acid or 2-iodoethanol on the tetrazole grafted polyacrylonitrile, and performing membrane scraping to prepare the modified polyacrylonitrile ultra-filtration membrane. The anti-pollution performance is improved while the rejection rate is improved, and the overall performance of the ultra-filtration membrane is optimized.

Description

technical field [0001] The invention relates to the technical field of membrane preparation, in particular to a modified polyacrylonitrile ultrafiltration membrane, a preparation method and an application. Background technique [0002] As one of the high-tech of this century, ultrafiltration membrane separation technology has become a standard of separation process due to its remarkable characteristics of normal temperature and low pressure operation, no phase change, and no energy consumption. It is widely used in drinking water purification, industrial water treatment, beverage, Biology, food, medicine, environmental protection and other industries. Among them, the flat-plate ultrafiltration membrane is a type of ultrafiltration membrane that can typically be applied to large-scale water treatment, tap water renovation, reclaimed water reuse, sewage treatment, and seawater desalination front-end. [0003] In foreign countries, ultrafiltration membranes are mainly used for...

Claims

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Application Information

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IPC IPC(8): B01D61/14B01D71/42B01D69/12B01D67/00C02F1/44
CPCB01D61/145B01D71/42B01D69/125C02F1/444B01D2325/36B01D2323/38
Inventor 卢静琼祁子玺高成云史宝萍赵玉英潘瑞丽
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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