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Reverse osmosis membrane, preparation method and applications thereof

A reverse osmosis membrane, R1-R4 technology, applied in the field of reverse osmosis membrane and its preparation, can solve the problems of illegality and poor chlorine resistance

Active Publication Date: 2019-04-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect of poor chlorine resistance of the existing polyamide reverse osmosis membrane, and provide a reverse osmosis membrane with excellent salt rejection rate, water permeability and chlorine resistance and its preparation method

Method used

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  • Reverse osmosis membrane, preparation method and applications thereof
  • Reverse osmosis membrane, preparation method and applications thereof
  • Reverse osmosis membrane, preparation method and applications thereof

Examples

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preparation example Construction

[0030] The present invention also provides a method for preparing a reverse osmosis membrane, the method comprising: in the presence of a photoinitiator, crossing sulfonated polyethersulfone having a structure shown in formula (I) and a structure shown in formula (II) Combined to form a separation layer;

[0031]

[0032] Among them, R 1 -R 4 Each is independently H or C1-C4 alkyl, and R 1 -R 4 Not H at the same time; R 5 -R 8 Each independently is H or -SO 3 M, and R 5 -R 8 Not H at the same time, M is an alkali metal.

[0033] In the present invention, the above-mentioned sulfonated polyethersulfone is not particularly limited, and various sulfonated polyethersulfones used in the separation layer of reverse osmosis membranes in the field can be used.

[0034] According to a preferred embodiment of the present invention, R 1 -R 4 each independently is H or methyl, and R 1 -R 4 not simultaneously H; preferably, R 1 -R 4 Both are methyl.

[0035] According to a...

Embodiment 1

[0067] 1.0 g of dried sulfonated polyarylethersulfone (ion exchange capacity: 1.98 mmol / g) and 0.2 g of benzophenone were dissolved in a mixed solvent composed of 100 g of formic acid, ethylene glycol monomethyl ether and deionized water. The bisphenol A polysulfone support layer was fixed on a glass plate, and the prepared coating solution was evenly brushed on the surface of the support layer, and then heat-treated at 70°C for 10 minutes to obtain an initial composite reverse osmosis membrane. Then put the initial membrane into a UV box with a wavelength of 254nm for 5 minutes and take it out to obtain a cross-linked sulfonated polyarylethersulfone composite reverse osmosis membrane (N1) with a separation layer thickness of 185nm.

Embodiment 2

[0069] 0.75 g of dried sulfonated polyarylethersulfone (ion exchange capacity: 1.16 mmol / g) and 0.0075 g of benzophenone were dissolved in a mixed solvent composed of 100 g of formic acid, ethylene glycol monomethyl ether and deionized water. The bisphenol A polysulfone support layer was fixed on a glass plate, and the prepared dilute coating solution was evenly brushed on the surface of the support layer, and then heat-treated at 50°C for 15 minutes to obtain an initial composite reverse osmosis membrane. Then put the initial membrane into a UV box with a wavelength of 254nm for 5 minutes and take it out to obtain a cross-linked sulfonated polyarylethersulfone composite reverse osmosis membrane (N2) with a separation layer thickness of 155nm.

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Abstract

The invention relates to the field of separation membranes, particularly to a reverse osmosis membrane and a preparation method thereof, and applications of the reverse osmosis membrane in water treatment. The reverse osmosis membrane comprises a support layer and a separation layer, wherein the support layer and the separation layer are adhered to each other, the separation layer is a cross-linked layer obtained by crosslinking sulfonated polyether sulfone having a structure represented by a formula (I) and sulfonated polyether sulfone having a structure represented by a formula (II), R1-R4 are respectively and independently H or C1-C4 alkyl, R1-R4 are not simultaneously H, R5-R8 are respectively and independently H or -SO3M, R5-R8 are not simultaneously H, and M is an alkali metal. According to the present invention, by crosslinking the sulfonated polyether sulfone in the separation layer of the polyamide reverse osmosis membrane, the molecular structure of the separation layer of the obtained reverse osmosis membrane is dense, such that the salt retention rate and the chlorine resistance of the reverse osmosis membrane are significantly improved; and the preparation method is simple, and is suitable for large-scale production. The formulas I and II are defined in the specification.

Description

technical field [0001] The invention relates to the field of separation membranes, in particular to a reverse osmosis membrane, a preparation method thereof and an application of the reverse osmosis membrane in a water treatment process. Background technique [0002] Reverse osmosis membrane has become one of the key technologies for water treatment because of its good separation performance for small organic molecules and inorganic salt ions, safety, environmental protection, and easy operation. So far, the main applications of reverse osmosis membranes are seawater and brackish water desalination, hard water softening, reclaimed water recovery, industrial wastewater treatment, and ultrapure water preparation. Currently, 90% of reverse osmosis membranes on the market are composite membranes, that is, composed of a separation layer and a support layer. Among them, the preparation methods of composite membranes mainly include: dilute solution coating method, interfacial poly...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D61/02B01D67/00B01D71/68B01D69/10C02F1/44
CPCB01D61/025B01D69/10B01D69/12B01D69/125B01D71/68B01D2325/023B01D2325/30C02F1/441
Inventor 张杨徐健刘轶群潘国元严昊
Owner CHINA PETROLEUM & CHEM CORP
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