Reverse osmosis membrane and preparation method and application thereof

A technology of reverse osmosis membrane and composite membrane, applied in the field of separation membrane, can solve the problem of poor pollution resistance of reverse osmosis membrane, and achieve the effects of improving anti-pollution ability, improving hydrophilicity and improving salt interception rate

Pending Publication Date: 2019-02-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the defect of poor pollution resistance of the existing reverse osmosis membrane, and provide a kind of reverse osmosis membrane with simple preparation method and excellent pollution resistance and its preparation method and the reverse osmosis membrane in the water treatment process Applications

Method used

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  • Reverse osmosis membrane and preparation method and application thereof

Examples

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preparation example Construction

[0040] The present invention also provides the preparation method of above-mentioned reverse osmosis membrane, and this method comprises the following steps:

[0041] (1) forming a polyamide separation layer on one surface of the support layer to obtain a composite membrane;

[0042] (2) In the presence of a curing agent, the composite film obtained in step (1) is contacted with an ammonium salt containing epoxy groups, so that the epoxy groups in the ammonium salts containing epoxy groups and the polyamide A crosslinking reaction occurs.

[0043] In the method of the present invention, there is no special limitation for the support layer, it can be made of various existing materials with certain strength and can be used for nanofiltration and reverse osmosis membranes, usually polyester, One or more of polyacrylonitrile, polyvinylidene fluoride, phenolphthalein non-sulfonated polyarylethersulfone, polyethersulfone and polysulfone. In addition, the support layer can be a sin...

preparation example 1

[0082] The upper surface of the support layer (the surface of the polysulfone layer, the same below) is contacted with an aqueous solution of m-phenylenediamine with a concentration of 2% by weight, and the liquid is drained after contacting at 25°C for 10 seconds; The Isopar E solution of the trimellitic chloride solution was drained after contacting at 25°C for 10s; then, the membrane was put into an oven and heated at 70°C for 3min to obtain a reverse osmosis membrane M1, which included a support layer and a separation layer, wherein, The thickness of the separation layer was 0.15 μm.

[0083] After immersing the obtained reverse osmosis membrane M1 in water for 24 hours, measure the water flux Q at a pressure of 1.55MPa and a temperature of 25°C 1 And the desalination rate to NaCl (2000ppm), the results are shown in Table 1. And under the same temperature and pressure conditions, test its fouling resistance, the membrane in the mixed aqueous solution containing 2000ppmNaC...

preparation example 2

[0085] At 25°C, the reverse osmosis membrane M1 prepared according to the method of Preparation Example 1 was immersed in an aqueous solution containing 2% by weight of polyvinyl alcohol, 0.1% by weight of glutaraldehyde, and a pH of 2 for 30s. After taking it out, the membrane was put into an oven at 70°C and heated for 5 minutes to obtain a pollution-resistant reverse osmosis membrane M2 with a surface-modified membrane formed on the upper surface of the polyamide separation layer, wherein the thickness of the surface-modified membrane was 0.12 μm.

[0086] After immersing the obtained reverse osmosis membrane M2 in water for 24 hours, measure the water flux Q at a pressure of 1.55MPa and a temperature of 25°C 1 And the desalination rate to NaCl (2000ppm), the results are shown in Table 1. And under the same temperature and pressure conditions, test its fouling resistance, the membrane in the mixed aqueous solution containing 2000ppmNaCl and 1000ppm hexadecyltrimethylammoniu...

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Abstract

The invention relates to the field of separation membranes and discloses a reverse osmosis membrane, a preparation method of the reverse osmosis membrane and an application of the reverse osmosis membrane in a water treatment process. The reverse osmosis membrane includes a support layer and a polyamide separation layer, wherein one surface of the polyamide separation layer is bonded to the support layer and the other surface is subjected to surface modification by an ammonium salt containing an epoxy group, so that an epoxy group in the ammonium salt containing the epoxy group crosslinks withthe polyamide. The reverse osmosis membrane provided by the invention improves the hydrophilicity of the membrane by crosslinking the ammonium salt containing an epoxy group on the surface of the polyamide membrane, makes the surface of the membrane carry a positive charge, and improves the anti-pollution ability of the membrane to cationic surfactant or other positively charged pollutants. Moreover, the epoxy group in the ammonium salt containing epoxy group crosslinks with polyamide, which increases the crosslinking density of the reverse osmosis membrane separation layer and further improves the salt interception rate of the membrane.

Description

technical field [0001] The invention relates to the field of separation membranes, in particular to a reverse osmosis membrane, a preparation method of the reverse osmosis membrane and an application of the reverse osmosis membrane in a water treatment process. Background technique [0002] Membrane separation technology is a new separation technology that appeared in the early 20th century and rose rapidly after the 1960s. Because membrane separation technology not only has the functions of separation, concentration, purification and refining, but also has the characteristics of high efficiency, energy saving, environmental protection, molecular level filtration, simple filtration process, and easy control, it is widely used in food, medicine, biology, environmental protection, etc. , chemical industry, metallurgy, energy, petroleum, water treatment, electronics, bionics and other fields have produced huge economic and social benefits, and have become one of the most import...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D71/48B01D71/42B01D71/34B01D71/68B01D69/12B01D69/02B01D67/00B01D61/02C02F1/44
CPCB01D61/025B01D67/0006B01D69/02B01D69/12B01D71/34B01D71/42B01D71/48B01D71/56B01D71/68B01D2323/30B01D2325/16B01D2325/36C02F1/441Y02A20/131
Inventor 张杨刘轶群潘国元严昊徐健
Owner CHINA PETROLEUM & CHEM CORP
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