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A solvent-resistant composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and solvent-resistant technology, which is applied in the direction of chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of few composite structure solvent-resistant nanofiltration membranes and performance needs to be further improved, and achieve the goal of improving chemical stability Effect

Active Publication Date: 2022-03-25
湖北瑞滤膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There have been many studies on the preparation of nanofiltration / reverse osmosis membranes by interfacial polymerization using aromatic polyacyl chlorides and polyamines as reactive monomers, but there are relatively few reports on solvent-resistant nanofiltration membranes with composite structures, and their performance remains to be seen. Further improve

Method used

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  • A solvent-resistant composite nanofiltration membrane and preparation method thereof
  • A solvent-resistant composite nanofiltration membrane and preparation method thereof
  • A solvent-resistant composite nanofiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Dissolution of Kevlar polyamide nanofibers

[0043]Dissolve 2.0 g of strong base KOH in 40 g of a mixed solvent of dimethylsulfoxide (DMSO):water (40:1 by volume). Take 2.0 grams of Kevlar nanofibers and add them to the above solution, and then mechanically stir at room temperature for 2 weeks to destroy a large number of hydrogen bonds between the carbonyl and amide groups between the molecules until the color becomes a uniform dark red Kevlar nanofiber solution. The obtained Kevlar nanofiber solution was left to stand for 30 days to further hydrolyze the amide into short polymer chain segments, and the length of the molecular chain segments was tested to be 10-60 nm.

[0044] (2) Synthesis of amino group-containing branched polyarylethersulfone (b-PAES-NH2)

[0045] 4,4'-Difluorodiphenylsulfone (20mmol, 5.0890g), 2,2'-bis(3-amino-4-hydroxyphenyl)hexafluoropropane (16mmol, 5.8601g), 2,2'- Bis(4-hydroxyphenyl)hexafluoropropane (3.4mmol, 1.1432g) and 4,4',4"-methyl...

Embodiment 2

[0058] Different from Example 1, in the preparation step of the solvent-resistant composite nanofiltration membrane, b-PAES-NH 2 The mass concentration is 1.5wt%, and a composite structure solvent-resistant nanofiltration membrane is obtained. Using the performance test method of Example 1, the solvent resistance performance is shown in Table 2. The permeation fluxes of different solvents are arranged in order as follows: acetone>ethyl acetate>methanol>ethanol>DMF>n-hexane. Among them, acetone has the highest flux of 15.4L m –2 h –1 bar –1 , the flux of ethyl acetate is 14.5L m –2 h –1 bar –1 , the flux of methanol is 7.1L m –2 h –1 bar –1 , the flux of ethanol is 6.4L m –2 h –1 bar –1 , the flux of DMF is 5.9L m –2 h –1 bar –1 , the flux of n-hexane is the lowest at 1.5L m –2 h –1 bar –1 . The prepared composite nanofiltration membrane has a rejection rate of 99.9% for rose bengal ethanol solution, 97.6% for Invention blue VF, 93.3% for yellow eosin, and 92...

Embodiment 3

[0062] Different from Example 1, in the preparation step of the solvent-resistant composite nanofiltration membrane, b-PAES-NH 2 The mass concentration is 2.0 wt%, and a composite structure solvent-resistant nanofiltration membrane is obtained. Using the performance test method of Example 1, the solvent resistance performance is shown in Table 3. The permeation fluxes of different solvents are arranged in order as follows: acetone>ethyl acetate>methanol>ethanol>DMF>n-hexane. Among them, acetone has the highest flux of 16.4L m –2 h –1 bar –1 , the flux of ethyl acetate is 15.6L m –2 h –1 bar –1 , the flux of methanol is 8.3L m –2 h –1 bar –1 , the flux of ethanol is 7.1L m –2 h –1 bar –1 , the flux of DMF is 6.5L m –2 h –1 bar –1 , the flux of n-hexane is the lowest at 1.6L m –2 h –1 bar –1 . The prepared composite nanofiltration membrane has a rejection rate of 99.9% for rose bengal ethanol solution, 96.4% for Invention blue VF, 92.7% for yellow eosin, and 9...

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Abstract

The invention discloses a solvent-resistant composite nanofiltration membrane and a preparation method thereof, belonging to the field of organic composite materials. The solvent-resistant composite nanofiltration membrane is composed of short chain segments of poly-p-phenylene terephthalamide and polyaryl ether sulfone with amino branched structure. The preparation method comprises three steps of dissolving poly-p-phenylene terephthalamide nanofibers, synthesizing polyaryl ether sulfone with amino branched structure and preparing solvent-resistant composite nanofiltration membrane. The membrane made by the invention has high flux transmission channel, good chemical stability and solvent resistance.

Description

technical field [0001] The invention relates to the field of organic composite materials, in particular to a solvent-resistant composite nanofiltration membrane and a preparation method thereof. Background technique [0002] The pressure-driven nanofiltration (nanofiltration) membrane separation technology has the advantages of no phase transition, no additives, and little temperature influence, and has been widely used. At present, nanofiltration membranes based on polyamide (PA), polyvinyl alcohol (PVA), sulfonated polysulfone (SPS), sulfonated polyethersulfone (SPES) and cellulose acetate (CA) and their derivatives, etc. , is mainly used in the separation and purification of aqueous phase systems, and usually exhibits excellent separation performance. [0003] With the application of nanofiltration membranes, the separation characteristics of nanofiltration have been further explored, requiring it to be more widely used in the separation and purification of organic phase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D71/58B01D69/12B01D67/00
CPCB01D71/58B01D71/68B01D69/125B01D67/0013B01D67/0011B01D61/027B01D2325/30
Inventor 廖俊斌阮文祥杜宝山魏华
Owner 湖北瑞滤膜科技有限公司
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