Composite reverse osmosis membrane as well as preparation method and application thereof

A technology of reverse osmosis membrane and cross-linking reaction, which is applied in the fields of semi-permeable membrane separation, chemical instruments and methods, osmosis/dialysis water/sewage treatment, etc., which can solve the problems of poor pollution resistance of reverse osmosis membrane

Inactive Publication Date: 2017-10-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] 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 composite reverse osmosis membrane with good pollution resi...

Method used

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  • Composite reverse osmosis membrane as well as preparation method and application thereof
  • Composite reverse osmosis membrane as well as preparation method and application thereof

Examples

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preparation example Construction

[0035] The present invention also provides a method for preparing a composite reverse osmosis membrane, the method comprising forming a separation layer on a support layer using cross-linked polyamide, and then passing a hydroxyl-containing polymer and a zwitterion-containing polymer on the separation layer The cross-linking reaction of the silane coupling agent forms a hydrophilic stain-resistant layer.

[0036] The present invention does not specifically limit the thickness of the support layer, separation layer and hydrophilic pollution-resistant layer, which can be a conventional choice in this field, but in order to make these three layers play a better synergistic effect, the obtained The composite reverse osmosis membrane can better have higher water flux and desalination rate and excellent pollution resistance performance. Preferably, the thickness of the support layer is 90-150 microns, and the thickness of the separation layer is 0.05- 0.5 microns, the thickness of t...

preparation example 1

[0059] This preparation example is used to illustrate the preparation method of the silane coupling agent (SKH550) containing zwitterions.

[0060] Add 5g of KH550 and 50mL of tetrahydrofuran into a three-necked flask equipped with magnetic stirring, condenser and nitrogen protection, then add 3g of 1,4-butyl sultone dropwise under stirring, then react at 60°C for 12h Finally, the silane coupling agent SKH550 containing zwitterions was obtained. The synthesis process is as figure 1 shown.

preparation example 2

[0062] This preparation example is used to illustrate the preparation method of the silane coupling agent (SKH540) containing zwitterions.

[0063] Add 5g of KH540 and 50mL of tetrahydrofuran into a three-necked flask equipped with magnetic stirring, condenser and nitrogen protection, then add 2g of 1,3-propyl sultone dropwise under stirring, then react at 60°C for 24h Finally, the silane coupling agent SKH540 containing zwitterions was obtained.

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Abstract

The invention relates to the field of water treatment and discloses a composite reverse osmosis membrane as well as a preparation method and application thereof. The composite reverse osmosis membrane comprises a supporting layer, a separation layer and a hydrophilic and pollution-resisting layer, which are stacked in sequence, wherein the separation layer is a layer formed by cross-linked polyamide; and the hydrophilic and pollution-resisting layer is a layer formed by carrying out a crosslinking reaction on a polymer containing hydroxyl and a silane coupling agent containing zwitterions. The reverse osmosis membrane provided by the invention not only has relatively high water flux and desalting rate, but also has relatively strong pollution-resisting performance; and the preparation method of the reverse osmosis membrane is simple and has an extremely good industrial application prospect.

Description

technical field [0001] The invention relates to a composite reverse osmosis membrane, a preparation method of the composite reverse osmosis membrane, a composite reverse osmosis membrane prepared by the method and an application of the composite reverse osmosis membrane in the field of water treatment. Background technique [0002] Membrane separation is a new separation technology that appeared at the beginning of the 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 bene...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/12B01D67/00C02F1/44
CPCB01D67/0006B01D69/125B01D71/56B01D2323/30B01D2325/36C02F1/441
Inventor 张杨刘轶群潘国元严昊徐健郭敏
Owner CHINA PETROLEUM & CHEM CORP
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