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Anti-pollution reverse osmosis membrane and preparation method and application thereof

A reverse osmosis membrane and anti-pollution technology, applied in semi-permeable membrane separation, chemical instruments and methods, osmosis/dialysis water/sewage treatment, etc., can solve the problem of low water flux of anti-pollution reverse osmosis membrane, and achieve production cost Inexpensive, simple and easy to control preparation method, good anti-pollution performance

Active Publication Date: 2021-08-17
蓝星(杭州)膜工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an anti-pollution reverse osmosis membrane and its preparation method and application, which solves the technical problem of low water flux of the existing anti-pollution reverse osmosis membrane

Method used

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  • Anti-pollution reverse osmosis membrane and preparation method and application thereof
  • Anti-pollution reverse osmosis membrane and preparation method and application thereof
  • Anti-pollution reverse osmosis membrane and preparation method and application thereof

Examples

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preparation example Construction

[0044] The present invention proposes a preparation method of an anti-pollution reverse osmosis membrane for the first time: comprising the following steps:

[0045] S1: Add a surfactant and a water-soluble crosslinking agent to the aqueous solution of the polymer, and mix well to obtain an aqueous phase solution; the surfactant is an anionic surfactant and / or cationic surfactant; the polymer is a neutral water-soluble polymer substance and / or charged water-soluble polymer; the mass fraction of the polymer in the aqueous phase solution is 0.1-5%; the mass fraction of the surfactant in the aqueous phase solution is 0.1-5%; the crosslinking agent in the aqueous phase solution The mass fraction is 0.1-0.5%.

[0046]S2: apply the aqueous phase solution in S1 on the composite membrane, let it stand for 30s-1min, pour off the excess aqueous phase solution on the composite membrane, and obtain a mixed composite membrane;

[0047] S3: Immediately react the composite membrane mixed in...

Embodiment 1

[0055] A preparation method of anti-pollution reverse osmosis composite membrane:

[0056] S1: Prepare an aqueous solution of polyvinylpyrrolidone with a mass fraction of 0.5%, add sodium lauryl sulfate with a mass fraction of 0.5%, mix well, then add glutaraldehyde with a mass fraction of 0.3%, mix well, and obtain aqueous solution;

[0057] S2: apply the uniformly mixed aqueous phase solution on the composite membrane, and pour off the excess aqueous phase solution after standing for 45 seconds;

[0058] S3: Immediately put the membrane into a microwave blast drying oven for 40 seconds, set the temperature at 85° C., take out the composite membrane, and obtain an anti-pollution reverse osmosis composite membrane. The anti-pollution reverse osmosis composite membrane prepared in this implementation is scanned by electron microscope, and the electron microscope photo is figure 1 shown.

[0059] The anti-pollution reverse osmosis composite membrane of this embodiment is test...

Embodiment 2

[0062] A preparation method of anti-pollution reverse osmosis composite membrane:

[0063] The mass fraction of sodium lauryl sulfate in step S1 is 0.1%, and the other steps are the same as the preparation method in Example 1.

[0064] The anti-pollution reverse osmosis composite membrane of this embodiment is tested at a pressure of 0.75MPa, a concentrated water flow rate of 1.0GPM, an ambient temperature of 25°C, a concentrated water pH of 6.5 to 7.5, and a concentrated water feed of 500PPm sodium chloride. Under these conditions, the highest interception rate of the composite membrane to sodium chloride is 99.4%, and the highest water flux is 74LMH.

[0065] After the anti-pollution reverse osmosis composite membrane in this example is continuously operated for 100 hours through 500ppm bovine serum albumin aqueous solution + 500ppm sodium chloride as the feed liquid, the rejection rate of the membrane to sodium chloride is the highest at 99.3%, and the water flux is the hig...

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Abstract

The invention relates to a preparation method of an anti-pollution reverse osmosis membrane, the preparation method comprises the following steps: adding a surfactant and a water-soluble cross-linking agent into an aqueous solution of a polymer, and uniformly mixing to obtain an aqueous phase solution, wherein the surfactant is an anionic surfactant and / or a cationic surfactant; the polymer is a neutral water-soluble polymer and / or a charged water-soluble polymer; coating the composite membrane with the aqueous phase solution, standing, and removing the residual aqueous phase solution on the composite membrane; and reacting the composite membrane under a microwave condition to obtain the anti-pollution reverse osmosis membrane. According to the preparation method of the anti-pollution reverse osmosis membrane, a uniform and thin anti-pollution layer is prepared through a surface coating method. According to the method, the composite membrane has good anti-pollution performance, and the water flux of the composite membrane is improved by about 30%. In addition, the preparation method is simple, easy to control, good in reproducibility, low in preparation cost and suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to an anti-pollution reverse osmosis membrane and its preparation method and application. Background technique [0002] Reverse osmosis membrane is an artificial semipermeable membrane with certain characteristics made by simulating biological semipermeable membrane, and is the core component of reverse osmosis technology. The principle of reverse osmosis technology is to separate these substances from water based on the fact that other substances cannot pass through the semi-permeable membrane under the action of the osmotic pressure higher than the solution. The membrane pore size of the reverse osmosis membrane is very small, so it can effectively remove dissolved salts, colloids, microorganisms, organic matter, etc. in water. [0003] Reverse osmosis membranes face various pollutions during use, including microbial pollution, organic matter and mineral oil pollution, po...

Claims

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Application Information

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IPC IPC(8): B01D69/02B01D69/12B01D67/00C02F1/44
CPCB01D69/02B01D69/125C02F1/441
Inventor 陈可可刘文超洪勇琦谭惠芬罗霄郑宏林潘巧明
Owner 蓝星(杭州)膜工业有限公司
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