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Double-layer polyamide surface layer composite reverse osmosis membrane and preparation method thereof

A double-layer polyamide and reverse osmosis membrane technology, which is applied in the field of water treatment, can solve problems such as short service life, loss of desalination performance, and influence on the wide application of reverse osmosis membranes, and achieve high salt retention rate, prolong service life, increase The effect of thickness

Active Publication Date: 2009-06-24
VONTRON TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing composite reverse osmosis membrane has high salt retention rate performance and water permeability performance, the ultra-thin polyamide surface layer is easy to be hydrolyzed, oxidized, scratched and loses the desalination performance, which seriously affects the reverse osmosis membrane. Wide application of membrane, and short service life

Method used

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  • Double-layer polyamide surface layer composite reverse osmosis membrane and preparation method thereof
  • Double-layer polyamide surface layer composite reverse osmosis membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: prepare composite reverse osmosis membrane according to the following steps:

[0022] (1) Preparation of A solution: get m-phenylenediamine 21.9g and dissolve it in 657g water to prepare an aqueous solution whose weight concentration is 3%. 7.3g of pyrrolidone, 14.6g of 2% triethylamine and 29.2g of 4% camphorsulfonic acid were stirred and dissolved to obtain A solution.

[0023] (2) Preparation of solution B: 0.9 g of trimesoyl chloride was dissolved in 597 g of cyclohexane to prepare an organic solution with a weight concentration of 0.15%, and solution B was obtained after stirring and dissolving.

[0024] (3) The preparation of C solution: with the preparation of A solution: get m-phenylenediamine 21.9g and be dissolved in 657g water and be mixed with the aqueous solution that weight concentration is 3%, after it dissolves completely, add weight percentage in this aqueous solution again 7.3g of 1% N-methylpyrrolidone, 14.6g of 2% triethylamine and 29....

Embodiment 2

[0027] Embodiment 2: prepare composite reverse osmosis membrane according to the following steps:

[0028] (1) Preparation of A solution: same as Example 1.

[0029] (2) Preparation of B solution: same as in Example 1.

[0030] (3) Preparation of C solution: same as in Example 1.

[0031] (4) Contact the porous support layer with solution A for 20 seconds, remove excess solution with a rubber roller, and form a polysulfone support layer on the porous support layer; then contact this polysulfone support layer with solution B for 10 seconds to form the first After the organic solvent evaporates to dryness, contact with solution C for 10 seconds to form a second polyamide surface layer, and then put it in an oven at 60°C to dry for five minutes to obtain a double-layer polyamide surface layer composite reverse osmosis membrane.

[0032] Take the diaphragm and test it on the diaphragm monitoring platform under the test conditions of 2000ppm NaCl aqueous solution, 225psi operatin...

Embodiment 3

[0033] Embodiment 3: prepare composite reverse osmosis membrane according to the following steps:

[0034] (1) Preparation of A solution: same as Example 1.

[0035] (2) Preparation of B solution: same as in Example 1.

[0036] (3) Preparation of C solution: same as in Example 1.

[0037] (4) Contact the porous support layer with solution A for 20 seconds, remove excess solution with a rubber roller, and form a polysulfone support layer on the porous support layer; then contact this polysulfone support layer with solution B for 10 seconds to form the first After the organic solvent volatilizes, contact with solution C for 20 seconds to form a second polyamide surface layer, and then put it in an oven at 60°C to dry for five minutes to obtain a double-layer polyamide surface layer composite reverse osmosis membrane.

[0038] Take the diaphragm and test it on the diaphragm monitoring platform under the test conditions of 2000ppm NaCl aqueous solution, 225psi operating pressure...

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Abstract

The invention discloses a double-layer polyamide surface layer composite reverse osmosis membrane and a preparation method thereof. The composite reverse osmosis membrane comprises a non-woven fabric layer and a porous supporting layer, wherein a double-layer polyamide surface layer which is prepared by reacting polyamine and poly (acyl chloride)s is arranged on the porous supporting layer. Compared with the prior art, the double-layer polyamide surface layer is arranged on the porous supporting layer of the prior reverse osmosis membrane, so that the thickness of the reverse osmosis membrane is increased; the membrane surface is more smooth, more hydrolysis resistant, more oxidation resistant, more scoring resistant and more pollution resistant; the abrasion resistance of the reverse osmosis membrane is improved; and the service life of the reverse osmosis membrane is prolonged. Moreover, the composite reverse osmosis membrane also has the characteristics of simple preparation and operation and high water permeability and salt retardation rate.

Description

technical field [0001] The invention relates to a double-layer polyamide surface layer composite reverse osmosis membrane with high water permeability and high salt retardation rate and a preparation method thereof, belonging to the technical field of water treatment. Background technique [0002] Composite reverse osmosis membrane is the most widely used reverse osmosis membrane variety, and its known structure is to form a polyamide surface layer with better separation performance on a porous support (for example, US5160619). Although the existing composite reverse osmosis membrane has high salt retention rate performance and water permeability performance, the ultra-thin polyamide surface layer is easy to be hydrolyzed, oxidized, scratched and loses the desalination performance, which seriously affects the reverse osmosis membrane. The membrane is widely used and has a short service life. Considering the application of the composite reverse osmosis membrane, the preparat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/12
Inventor 邹昊金焱徐坚彭慧敏吴宗策
Owner VONTRON TECH CO LTD
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