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Reverse osmosis membrane, and preparation method and application thereof

A technology of reverse osmosis membrane and cross-linking reaction, which is applied in the field of separation membrane, can solve the problems of poor desalination rate and water permeability, and achieve the effect of simple preparation method, excellent desalination rate and good comprehensive performance

Active Publication Date: 2018-05-01
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 provide a new reverse osmosis membrane and its preparation method and the reverse osmosis membrane in the water applications in the field of processing

Method used

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

Examples

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preparation example Construction

[0030] The preparation method of the reverse osmosis membrane provided by the present invention comprises sequentially forming a separation layer, an intermediate connection layer and a crosslinking layer on a support layer, the separation layer is formed by sulfonated polyarylether sulfone represented by formula (1), and the The middle connecting layer is formed of polyethylene glycol, and the cross-linked layer is formed of cross-linked alginate;

[0031]

[0032] Wherein, M is K, Na or Li, and n is 10-100; preferably, M is Na, and n is 25-75.

[0033]The present invention has no special limitation on the thickness of the support layer, separation layer, intermediate connection layer and crosslinking layer, which can be a conventional choice in this field, but in order to make these four layers play a better synergistic effect, making The obtained reverse osmosis membrane has better desalination rate, water permeability and chlorine resistance, preferably, the thickness o...

Embodiment 1

[0066] The method of dip coating is applied on the surface of the separation layer of the reverse osmosis membrane M1 obtained in Comparative Example 1 to coat a layer of 1 wt% polyethylene glycol (number average molecular weight is 10000) aqueous solution, after drying at 80° C. for 10 min, to obtain The modified initial membrane includes a support layer, a separation layer and an intermediate connection layer stacked in sequence. Then 1.0g sodium alginate (the number average molecular weight is 60000) and 0.1g glutaraldehyde are dissolved in 100g deionized water, and the dilute hydrochloric acid of 1mol / L is dripped under stirring, and the pH value of adjustment solution is 2, then at normal temperature After stirring for 24 hours, a clear coating solution was obtained by filtration. Coating the coating solution on the surface of the intermediate connection layer of the prepared modified initial membrane, and then heating at 100°C for 10 minutes to obtain a reverse osmosis m...

Embodiment 2

[0068] The method of dip coating is applied on the surface of the separation layer of the reverse osmosis membrane M3 obtained in Comparative Example 3 to coat a layer of 2.5% by weight polyethylene glycol (number average molecular weight is 6000) in aqueous solution, after drying at 60°C for 20min, to obtain The modified initial membrane includes a support layer, a separation layer and an intermediate connection layer stacked in sequence. Then 1.0g sodium alginate (the number-average molecular weight is 85000) and 0.1g glutaraldehyde are dissolved in 100g deionized water, and the dilute hydrochloric acid of 1mol / L is dripped under stirring, and the pH value of adjusting solution is 2, then at normal temperature After stirring for 24 hours, a clear coating solution was obtained by filtration. Coating the coating solution on the surface of the intermediate connection layer of the prepared modified initial membrane, and then heating at 120°C for 2 minutes to obtain a reverse osm...

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Abstract

The invention discloses a reverse osmosis membrane, and a preparation method and application thereof, belonging to the field of separating membranes. The reverse osmosis membrane comprises a supporting layer, a separating layer, an intermediate connecting layer and a cross-linking layer which are successively laminated, wherein the separating layer is formed by sulfonated polyether sulphone as shown in a formula (1) which is described in the specification; the intermediate connecting layer is formed by polyethylene glycol; the cross-linking layer is formed by cross-linking alginate; and in theformula (1), M is K, Na or Li, and n is in a range of 10 to 100. The reverse osmosis membrane provided by the invention has excellent salt rejection rate, water permeability and chlorine resistance and good industrial application prospects.

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, 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] 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. Wherein, the preparation methods of the compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/10B01D71/68C02F1/44
CPCB01D67/0006B01D69/10B01D71/68C02F1/441Y02A20/131
Inventor 张杨刘轶群潘国元严昊徐健郭敏
Owner CHINA PETROLEUM & CHEM CORP
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