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Preparation method for polyamide composite nanofiltration membrane

A composite nanofiltration membrane and polyamide technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as poor anti-scaling and pollution, poor oxidation resistance, poor chlorine resistance, etc., to achieve The effect of short time, high retention rate and simple process

Inactive Publication Date: 2014-05-07
NANTONG SUTONG SEPARATION ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aromatic polyamide has the advantages of high desalination and filtration, large flux, excellent chemical stability, wide application pH range (4-11), resistance to biodegradation, and low operating pressure requirements, but it is not resistant to oxidation, anti-fouling and pollution. Poor, poor chlorine resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A preparation method of polyamide composite nanofiltration membrane, comprising the following steps:

[0015] Step 1, soak the polysulfone-based membrane in the triethylamine buffer solution of m-xylylenediamine, after 20s, take out the base membrane, and remove the liquid on the surface;

[0016] Step 2, soaking the basement membrane treated in step 1 in the n-hexane solution of trimesoyl chloride, after reacting for 15 seconds, taking out the basement membrane, and removing the liquid on the surface;

[0017] Step 3: Dry the base film obtained in Step 2 and put it in an oven for 15 minutes at 70°C to obtain the final product.

[0018] With the sodium sulfate aqueous solution of 2000ppm, sodium chloride aqueous solution, PEG-200 aqueous solution and PEG-400 aqueous solution test the initial performance of membrane under 1MPa pressure, the desalination rate of gained polyamide composite nanofiltration membrane to sodium sulfate and sodium chloride is respectively 97.6%...

Embodiment 2

[0020] A preparation method of polyamide composite nanofiltration membrane, comprising the following steps:

[0021] Step 1, soak the polysulfone base membrane in m-xylylenediamine solution, after 10s, take out the base membrane, and remove the liquid on the surface;

[0022] Step 2, soaking the basement membrane treated in step 1 in the trimesoyl chloride solution, reacting for 5 to 30 seconds, taking out the basement membrane, and removing the liquid on the surface;

[0023] Step 3: Dry the base film obtained in Step 2 and put it in an oven for 20 minutes at 20°C to obtain the final product.

[0024] With the sodium sulfate aqueous solution of 2000ppm, sodium chloride aqueous solution, PEG-200 aqueous solution and PEG-400 aqueous solution test the initial performance of membrane under 1MPa pressure, the desalination rate of gained polyamide composite nanofiltration membrane to sodium sulfate and sodium chloride is respectively 92.6% and 53.2%, the removal rates of PEG-200 a...

Embodiment 3

[0026] A preparation method of polyamide composite nanofiltration membrane, comprising the following steps:

[0027] Step 1, soaking the polysulfone base membrane in the triethylamine buffer solution of m-xylylenediamine, after 90s, taking out the base membrane, and removing the liquid on the surface;

[0028] Step 2, soaking the basement membrane treated in step 1 in a n-hexane solution of trimesoyl chloride, and reacting for 30 seconds, taking out the basement membrane, and removing the liquid on the surface;

[0029] Step 3: Dry the base film obtained in Step 2 and put it in an oven for 100 minutes at 150°C to obtain the final product.

[0030] With the sodium sulfate aqueous solution of 2000ppm, sodium chloride aqueous solution, PEG-200 aqueous solution and PEG-400 aqueous solution test the initial performance of membrane under 1MPa pressure, the desalination rate of gained polyamide composite nanofiltration membrane to sodium sulfate and sodium chloride is respectively 9...

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Abstract

The invention provides a preparation method for a polyamide composite nanofiltration membrane. The preparation method comprises the following steps: firstly soaking a polysulfone base membrane in an m-xylylene diamine solution for 10-90 seconds, taking out the base membrane, and removing liquid on the surface; soaking the treated base membrane in a trimesoyl chloride solution, reacting for 5-30 seconds, taking out the base membrane and removing liquid on the surface; and finally airing the base membrane, and then putting in a drying oven for treating for 10-20 minutes, thus obtaining the polyamide composite nanofiltration membrane. According to the preparation method, the filtration membrane can obtained through compound within short time, with simple technique and low cost, and the water flux of the polyamide composite nanofiltration membrane is above 60L / h*m<2>, and the polyamide composite nanofiltration membrane has high rejection rate to divalent metal ion organic salts, and lower rejection rate to monovalent metal organic salts.

Description

technical field [0001] The invention belongs to the technical field of polymer membrane materials, and in particular relates to a preparation method of polyamide conforming to nanofiltration membranes. Background technique [0002] Nanofiltration membranes are a new type of separation membrane that came out in the 1980s. Its separation performance is between reverse osmosis and ultrafiltration, and its operating pressure is low. Organic matter has higher retention characteristics. Nanofiltration membranes have been widely used in food, petrochemical, pharmaceutical, metallurgy and other fields. [0003] Membrane materials are the core of membrane technology. Most of the ultra-thin layer polymers of commercially successful composite membranes are aromatic polyamides. Aromatic polyamide has the advantages of high desalination and filtration, large flux, excellent chemical stability, wide application pH range (4-11), resistance to biodegradation, and low operating pressu...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/12B01D67/00
Inventor 葛红军徐丽梅杨伟东邱玉梅沙嘉敏
Owner NANTONG SUTONG SEPARATION ENG & TECH
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