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 membr

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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Example Embodiment

[0044] The present invention first proposes a method for preparing anti-polluting reverse osmosis membrane: including the following steps:

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

[0046]S2: The aqueous phase solution in S1 is coated on the composite film, allowing 30s-1 min, poured down excess aqueous phase solution on the composite film to obtain a mixed composite film;

[0047] S3: immediately reacts the composite film mixed in S2 at 80-90 ° C under microwave conditions for 15 s-1min to obtain anti-pollution reverse osmosis membr...

Example Embodiment

[0054] Example 1

[0055] Preparation method of anti-pollution reverse osmosis composite film:

[0056] S1: The aqueous solution of polyvinylpylanone having a mass fraction of 0.5% is added, and the weight of 0.5% is 0.5% sodium sulfate, mix well, and then add 0.3% glutaraldehyde, mix well, result Aqueous phase solution;

[0057] S2: The mixed uniform aqueous phase solution is applied to the composite film, and then the excess aqueous phase solution is poured after 45 s;

[0058] S3: Immediately put the film in a microwave blast drying tank, and the temperature is set to 85 ° C, and the composite film is removed, and the anti-pollution reverse osmosis composite film is obtained. The anti-pollution reverse penetration composite film prepared by the present invention performs electron microscopy, electron microscope photos figure 1 Indicated.

[0059] The anti-contaminated reverse osmotic composite film of the present embodiment is 0.75 MPa at the test pressure, the concentrated wat...

Example Embodiment

[0061] Example 2

[0062] Preparation method of anti-pollution reverse osmosis composite film:

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

[0064] The anti-contaminated reverse osmotic composite film of the present embodiment is 0.75 MPa at the test pressure, the concentrated water flow is 1.0 gpm, the ambient temperature is 25 ° C, the concentrated water pH is 6.5 ~ 7.5, and the concentrated water is 500 ppm sodium chloride water. Under conditions, the retention rate of the composite film on sodium chloride was up to 99.4%, and the water flux was up to 74LMH.

[0065] The anti-contaminated reverse osmotic composite film in this embodiment is continuously operated by a 500 ppm of bovine serum solution + 500 ppm sodium chloride for the feed liquid, the diaphragm is up to 99.3%, the highest water flux is the highest. 66LMH.

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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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