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Reverse osmosis membrane and its preparation method and application

A technology of reverse osmosis membrane and membrane casting solution, which is applied in the direction of reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc. It can solve the problems of increased membrane pretreatment cost, weak chlorine resistance, and reduced service life.

Active Publication Date: 2014-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chemical structure of polyamide makes the chlorine resistance of this type of composite membrane very weak. All commercial polyamide composite membranes have almost zero tolerance to free chlorine, which increases the cost of membrane pretreatment and reduces its service life.

Method used

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  • Reverse osmosis membrane and its preparation method and application

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preparation example Construction

[0031] The preparation method of the reverse osmosis membrane provided by the present invention comprises the steps of uniformly coating the casting solution containing the phenolphthalein type sulfonated polyarylether sulfone having the structure shown in formula (I) and a solvent on the support layer to form a nascent membrane, and applying the The solvent in the nascent membrane is removed to obtain a composite membrane including a laminated support layer and a phenolphthalein-type sulfonated polyarylethersulfone layer, and then a coating solution containing a hydrophilic polymer and water is evenly coated on the phenolphthalein-type sulfonated polyarylethersulfone layer. The surface of the polyarylether sulfone layer is oxidized and thermally cured;

[0032] Formula (Ⅰ),

[0033] Among them, R 1 -R 15 for H or C 1 -C 5 The alkyl group, n≥2.

[0034] The present invention does not specifically limit the dosage of the casting solution and the coating solution, but in ...

Embodiment 1

[0058] This example is used to illustrate the reverse osmosis membrane provided by the present invention and its preparation method.

[0059] 0.5 g of dried phenolphthalein-type sulfonated polyarylethersulfone P-SPAES (purchased from Tianjin Yanjin Technology Co., Ltd., R 1 -R 14 H, n is 60, ion exchange capacity is 1.37mmol / g) dissolved in a mixed solvent consisting of 30g formic acid, 30g ethylene glycol monomethyl ether and 39.4g deionized water, then add 0.1g lithium chloride and mix Evenly, the casting solution is obtained. Fix the bisphenol A polysulfone ultrafiltration membrane (purchased from Dow Chemical, with a thickness of 125 microns, the same below) on a glass plate, and evenly coat the above casting solution on the bisphenol A polysulfone ultrafiltration membrane The surface was then heat-treated at 70 °C for 30 minutes to remove the solvent, and a composite membrane F1 including a laminated support layer and a phenolphthalein-type sulfonated polyarylethersulfo...

Embodiment 2

[0063] This example is used to illustrate the reverse osmosis membrane provided by the present invention and its preparation method.

[0064] 0.75g of dried phenolphthalein-type sulfonated polyarylethersulfone P-SPAES (purchased from Tianjin Yanjin Technology Co., Ltd., R 1 -R 14 is H, n is 52, and the ion exchange capacity is 1.37mmol / g) is dissolved in a mixed solvent composed of 20g formic acid, 40g ethylene glycol monomethyl ether and 39.1g deionized water, and then 0.15g lithium chloride is added and mixed Evenly, the casting solution is obtained. Fix the bisphenol A polysulfone ultrafiltration membrane on a glass plate, and evenly coat the above-mentioned casting solution on the surface of the bisphenol A polysulfone ultrafiltration membrane, and then heat-treat at 70°C for 30 minutes to remove the solvent, A composite membrane F2 comprising a laminated support layer and a phenolphthalein-type sulfonated polyarylethersulfone layer (thickness 0.25 μm) was obtained.

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Abstract

The invention provides a reverse osmosis membrane, a reverse osmosis membrane preparation method, the reverse osmosis membrane prepared by the preparation method, and the reverse osmosis membrane application in the field of water treatment. The reverse osmosis membrane includes a support layer, a phenolphthalein sulfonated poly aryl ether sulfone layer and a hydrophilic polymer layer which are sequentially layered, the phenolphthalein sulfonated poly aryl ether sulfone layer comprises phenolphthalein sulfonated poly aryl ether sulfone with a structure shown as formula (I), the phenolphthalein sulfonated poly aryl ether sulfone layerand the hydrophilic polymer layer are different in composition, R1 to R15 are H or C1-C5 alkyls, and n is greater than or equal to 2. The reverse osmosis membrane provided by the invention has excellent chlorine resistance, and high water flux and desalination rate. The formula (I) is shown in the specification.

Description

technical field [0001] The invention relates to a reverse osmosis membrane, a preparation method of the reverse osmosis membrane, a reverse osmosis membrane prepared by the method, and an application of the reverse osmosis membrane in the field of water treatment. Background technique [0002] Membrane separation 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 has been widely used in food, medicine, biological , Environmental protection, 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 important me...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D69/12B01D67/00B01D61/08C02F1/44
CPCY02A20/131
Inventor 张杨刘轶群潘国元郭敏严昊
Owner CHINA PETROLEUM & CHEM CORP
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