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A kind of composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and base membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of large difference in rejection rate, low water flux, weak double charge, etc., to achieve Good desalination rate, low preparation cost, and cheap raw materials

Active Publication Date: 2022-07-19
OCHEMATE MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the two amphoteric charged nanofiltration membranes are effective for salt solutions of high-valent cations and high-valent anions (such as MgSO 4 , MgCl 2 、Na 2 SO 4 ) has interception effect, but the interception rate of the three salts is quite different, the membrane exhibits a weaker double charge, and the water flux is lower

Method used

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  • A kind of composite nanofiltration membrane and preparation method thereof
  • A kind of composite nanofiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076](1) Mix 1 g of polydiallyl dimethyl ammonium chloride with 1000 ml of deionized water at 25° C. to obtain a first aqueous phase solution. Mix 100g m-phenylenediamine with 1000ml deionized water at 25°C to obtain a second aqueous solution; mix 2g terephthaloyl chloride with 1000ml cyclohexane at 25°C to obtain a mixed solution;

[0077] (2) providing a meta-aramid fiber hollow fiber base membrane with a molecular weight cut-off of 5000, immersing the base membrane in the first aqueous phase solution at 20°C, taking out after 15 minutes and drying at 25°C for 5 minutes;

[0078] (3) Immerse the dried base film in step (2) into the mixed solution at 20°C, take it out after 1 minute, and dry it at 100°C for 2 minutes to obtain the base film (the first desalination layer) covered by the first desalination layer. The thickness of 10nm);

[0079] (4) immersing the base film covered by the first desalination layer in step (3) into the second aqueous phase solution at 20°C, taki...

Embodiment 2

[0083] (1) Mix 1 g of polydiallyl dimethyl ammonium chloride, 1 g of sodium dodecyl sulfate and 1000 ml of deionized water at 25° C. to obtain a first aqueous phase solution. Mix 100g m-phenylenediamine, 0.5g triethylamine and 1000ml deionized water at 25°C to obtain a second aqueous solution; mix 2g terephthaloyl chloride and 1000ml cyclohexane at 25°C to obtain a mixed solution solution;

[0084] (2) providing a meta-aramid fiber hollow fiber base membrane with a molecular weight cut-off of 5000, immersing the base membrane in the first aqueous phase solution at 20°C, taking out after 15 minutes and drying at 25°C for 5 minutes;

[0085] (3) Immerse the dried base film in step (2) into the mixed solution at 20°C, take it out after 1 minute, and dry it at 100°C for 2 minutes to obtain the base film (the first desalination layer) covered by the first desalination layer. The thickness of 25nm);

[0086] (4) immersing the base film covered by the first desalination layer in st...

Embodiment 3

[0090] (1) Mix 2.5 g of polyethyleneimine, 1 g of sodium dodecyl sulfate and 1000 ml of deionized water at 25° C. to obtain a first aqueous phase solution. Mix 5g piperazine, 0.5g triethylamine and 1000ml deionized water at 25°C to obtain a second aqueous solution; mix 2g trimesoyl chloride and 1000ml isoparaffin Isopar G at 25°C to obtain a mixed solution ;

[0091] (2) Provide a modified meta-aramid fiber hollow fiber base membrane with a molecular weight cut-off of 45,000, immerse the base membrane in the first aqueous phase solution at 30°C, take it out after 1 minute, and dry it at 25°C for 7 minute;

[0092] (3) Immerse the dried base film in step (2) into the mixed solution at 30°C, take it out after 1 minute, and dry it at 70°C for 10 minutes to obtain the base film (the first desalination layer) covered by the first desalination layer. The thickness of 30nm);

[0093] (4) immersing the base film covered by the first desalination layer in step (3) into the second aq...

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Abstract

The invention provides a composite nanofiltration membrane, which comprises a base membrane and a separation layer; the separation layer is a double-charged polyamide layer. The composite nanofiltration membrane of the invention is a double-charged-layer hollow fiber composite nanofiltration membrane, which can not only effectively improve the interception efficiency of divalent cations and divalent anions, but also has higher pure water flux.

Description

technical field [0001] The invention relates to a composite nanofiltration membrane and a preparation method thereof. Background technique [0002] Nanofiltration (NF) is a membrane separation technology between ultrafiltration (UF) and reverse osmosis (RO). Nanofiltration membranes have good separation performance for high-valent salts, divalent salts and small molecular organics, and have the advantages of low operating pressure, large pure water flux, and low cost. They are widely used in water softening, desalination, wastewater treatment and other fields. application prospects. [0003] At present, the existing composite nanofiltration membranes include positively charged nanofiltration membranes and negatively charged nanofiltration membranes, which have high interception efficiencies for some specific divalent cations and divalent anions, respectively. In addition, these two membranes have a good interception effect on the high-valent ion salt solution containing th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/72B01D71/56B01D69/12B01D69/08B01D67/00B01D61/02
CPCB01D71/56B01D71/72B01D69/12B01D69/08B01D67/0002B01D61/027Y02A20/131
Inventor 王蒙王文宠沈艳君
Owner OCHEMATE MATERIAL TECH CO LTD
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