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Method for enhancing selective permeability of reverse osmosis membrane by adjusting pore size of base membrane

A reverse osmosis membrane and permeability technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve problems such as unfavorable exploitation and use, groundwater too deep from the surface, etc., to improve water flux and salt retention. rate, less defects, good cross-linking degree

Active Publication Date: 2021-08-31
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the fresh water reserves of groundwater are also very large, but most of the groundwater is too deep from the surface, which is not conducive to exploitation and use

Method used

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  • Method for enhancing selective permeability of reverse osmosis membrane by adjusting pore size of base membrane
  • Method for enhancing selective permeability of reverse osmosis membrane by adjusting pore size of base membrane
  • Method for enhancing selective permeability of reverse osmosis membrane by adjusting pore size of base membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A method for enhancing the permeability selectivity of a reverse osmosis membrane by adjusting the basement membrane pore size, comprising the following steps:

[0032] 1) Preparation of casting solution: put 1.2g of polysulfone particles (produced by Solvay Specialty Polymer Co., Ltd., USA) and 8.8g of organic solvent N,N-dimethylformamide into a round bottom flask, heat and stir until Completely dissolve to obtain the casting solution; after standing the casting solution for degassing for 24 hours, set aside;

[0033]2) Preparation of the base film: spread the non-woven fabric on a flat glass plate, and then evenly coat the casting solution after step 1) degassing on the non-woven fabric (the non-woven fabric is produced by Mitsubishi Corporation of Japan, the same below. ), make the casting solution fully infiltrate the non-woven fabric, and use a scraper to scrape off the excess liquid evenly on the surface of the non-woven fabric to form the bottom film layer; then...

Embodiment 2

[0038] The preparation process of the reverse osmosis membrane in Example 2 was repeated in Example 1, the difference being that "step 1) of Example 2 was replaced by 1.4g of polysulfone particles and 8.6g of organic solvent N,N-dimethyl Formamide was put into a round-bottomed flask, heated and stirred until it was completely dissolved to obtain a casting solution; the casting solution was allowed to stand for degassing for 24 hours, and then it was ready for use”. The final film number was named M-14.

Embodiment 3

[0040] Example 3 The preparation process of the reverse osmosis membrane was repeated in Example 1, the difference being that "step 1) of Example 3 was replaced with 1.6g of polysulfone particles and 8.4g of organic solvent N,N-dimethylformaldehyde Put the amide into a round-bottomed flask, heat and stir until it is completely dissolved to obtain a film-casting solution; leave the film-casting solution to defoam for 24 hours, and then set aside." The number of the finally prepared membrane was named M-16.

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Abstract

The invention discloses a method for enhancing the selective permeability of a reverse osmosis membrane by adjusting the pore size of a base membrane. The method comprises the following steps: adding sodium lauryl sulfate with a certain concentration into a membrane casting solution containing polysulfone, blade-coating the membrane casting solution on a non-woven fabric, and carrying out phase inversion in a coagulating bath. Due to the action of a highly hydrophilic end of the added sodium lauryl sulfate, the exchange speed between a solvent and a non-solvent is accelerated, so that the phase inversion speed is converted from delayed phase separation to instantaneous phase separation, and base membrane with different pore sizes is generated; and an amine monomer dissolved in a water phase and a multi-acyl chloride monomer dissolved in an oil phase are subjected to an interfacial polymerization reaction on the base membrane, and a polyamide ultrathin layer is compounded, so that the thin-layer composite reverse osmosis membrane is formed. By modifying the base membrane, the pore size of the base membrane is increased to a certain extent, the compactness of a separation layer is improved, the water flux and salt rejection rate of a final membrane product are improved, the selective permeability of the membrane is improved, and a good technical effect is achieved.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a method for enhancing the selective permeability of a reverse osmosis membrane by adjusting the pore size of a base membrane. Background technique [0002] Water is the basic need to maintain life and health. Although 70.9% of the earth is covered by water, the fresh water resources that can be used are extremely limited. Among the global water resources, 97.5% of seawater is not directly drinkable. In the remaining 2.5% of fresh water, 87% is ice and snow in glaciers that humans cannot directly use. In addition, the fresh water reserves of groundwater are also very large, but most of the groundwater is too deep from the surface, which is not conducive to exploitation and use. The fresh water resources that humans can use relatively easily at present mainly include river water, lake water and shallow groundwater. These fresh water reserves account for only 0.3% of the total...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/02B01D69/12B01D71/56B01D71/68
CPCB01D61/025B01D71/68B01D67/0002B01D67/0081B01D67/0095B01D67/0016B01D71/56B01D69/12B01D67/0006B01D69/02B01D2325/02Y02A20/131
Inventor 宋潇潇彭磊周勇高从堦
Owner ZHEJIANG UNIV OF TECH
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