Reverse osmosis membrane as well as preparation method and application thereof

A technology of reverse osmosis membrane and support layer, used in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve problems such as salt rejection and poor water permeability

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a reverse osmosis membrane with excellent salt rejection, water permeability and chlorine resistance in order to overcome the defects of poor salt rejection and water permeability of the existing sulfonated polyarylethersulfone reverse osmosis membranes. Osmotic membrane, a method for preparing a reverse osmosis membrane, a reverse osmosis membrane prepared by the method, and the application of the reverse osmosis membrane in the field of water treatment

Method used

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  • Reverse osmosis membrane as well as preparation method and application thereof
  • Reverse osmosis membrane as well as preparation method and application thereof
  • Reverse osmosis membrane as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0042] The preparation method of the reverse osmosis membrane provided by the present invention includes casting polyhedral oligomeric silsesquioxane, a sulfonated polyaryl ether sulfone with a structure shown in any one of formula (I) to formula (III), and a solvent. The membrane liquid is coated on the support layer to form a nascent membrane, and the solvent in the nascent membrane is removed to obtain a reverse osmosis membrane of the support layer and the separation layer on the surface of the support layer;

[0043]

[0044] Among them, in formula (Ⅰ), R 1 -R 15 Same or different, and each independently is H or C 1 -C 5 The alkyl group, m≥2;

[0045] In formula (Ⅱ), R 1 '-R 22 'Same or different, and each independently is hydrogen or C 1 -C 5 The alkyl group, R 23 'Is a chemical bond or C 1 -C 5 The alkylene group, p: q=0-10:1;

[0046] In formula (Ⅲ), R 1 ''-R 17 ''Same or different, and each independently is hydrogen or C 1 -C 5 The alkyl group, n≥2.

[0047] The present inven...

Embodiment 1

[0072] This example is used to illustrate the reverse osmosis membrane provided by the present invention and its preparation method.

[0073] 0.01g of monoaminopropyl heptaisobutyl silsesquioxane with the structure represented by formula (Ⅷ) was added to 100g of a mixed solvent (formic acid, ethylenedioxide) composed of formic acid, ethylene glycol monomethyl ether and deionized water The weight ratio of alcohol monomethyl ether and deionized water is 70:25:5, the same below), the uniform dilute solution is made after ultrasonic dispersion. Then add 1.0g of dried C-SPAES (purchased from Tianjin Yanjin Technology Co., Ltd., with the structure shown in formula (IV), R 1 -R 15 Is H, m is 60, and ion exchange capacity is 1.49mmol / g), after stirring and dissolving, a casting solution is prepared. Fix the bisphenol A polysulfone ultrafiltration membrane (purchased from Dow Chemical, the thickness is 125 microns, the same below) on the glass plate, and evenly brush the prepared casting ...

Embodiment 2

[0076] This example is used to illustrate the reverse osmosis membrane provided by the present invention and its preparation method.

[0077] Add 0.02g monoaminopropyl heptaisobutyl silsesquioxane with the structure represented by formula (VIII) into 100g mixed solvent composed of formic acid, ethylene glycol monomethyl ether and deionized water, after ultrasonic dispersion Make a homogeneous dilute solution. Then add 1.0g of dried C-SPAES (purchased from Tianjin Yanjin Technology Co., Ltd., with the structure shown in formula (IV), R 1 -R 15 It is H, m is 80, and the ion exchange capacity is 1.37mmol / g). After stirring and dissolving, a casting solution is prepared. Fix the bisphenol A polysulfone ultrafiltration membrane on the glass plate, and evenly brush the prepared casting solution on the surface of the ultrafiltration membrane, and then heat it at 70°C for 30 minutes to obtain the support layer and the The reverse osmosis membrane M2 of the separation layer on the surfac...

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Abstract

The invention discloses a reverse osmosis membrane, a preparation method of the reverse osmosis membrane and application of the reverse osmosis membrane to the field of water treatment. The reverse osmosis membrane comprises a support layer and a separation layer which is positioned on the surface of the support layer, wherein the separation layer comprises polyhedral oligomeric silsesquioxane and sulfonated poly ether sulfone which has a structure as shown in any one of formula (I) to formula (III). The reverse osmosis membrane provided by the invention has excellent chlorine resistance and relatively high water flux and desalination ratio at the same time.

Description

Technical field [0001] The invention relates to a reverse osmosis membrane, a preparation method of a reverse osmosis membrane, a reverse osmosis membrane prepared by the method, and the application of the reverse osmosis membrane in the field of water treatment. Background technique [0002] Reverse osmosis membrane has become one of the key technologies of 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 in 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 the composite membrane mainly include: dilute solution coatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/70B01D69/10B01D67/00B01D61/08C02F1/44
CPCY02A20/131
Inventor 张杨刘轶群潘国元郭敏严昊
Owner CHINA PETROLEUM & CHEM CORP
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