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Membrane functional monomer containing hexafluoroisopropanol group and nanofiltration membrane preparation method thereof

A technology of hexafluoroisopropanol and functional monomer, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation and other directions, to achieve the effect of good interception effect, stable performance and strong resistance to the oxidation performance of free chlorine

Active Publication Date: 2012-07-04
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few studies at home and abroad on the use of fluorine-containing diamine monomers dissolved in water for interfacial polymerization

Method used

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  • Membrane functional monomer containing hexafluoroisopropanol group and nanofiltration membrane preparation method thereof
  • Membrane functional monomer containing hexafluoroisopropanol group and nanofiltration membrane preparation method thereof
  • Membrane functional monomer containing hexafluoroisopropanol group and nanofiltration membrane preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Monomer 2,2'-bis(1-hydroxy-1-trifluoromethyl-2,2,2-trifluoroethyl)-4,4'-idene containing hexafluoroisopropanol group nanofiltration membrane Synthesis of methyl dianiline:

[0032] To the three-necked flask, add 4,4'-methylene dianiline (1.98g, 10mmol), p-toluenesulfonic acid (0.05g, 0.03mmol) and xylene 8mL, connect a water separator and a condenser, stir and heat up to 100 °C. At 100 °C, hexafluoroacetone trihydrate (3.3 g, 15 mmol) was added dropwise to the three-necked flask with a constant pressure funnel, reacted for 1 hour, then heated to 140 °C, refluxed for 5 hours, and the liquid in the water separator was clarified After the layers are separated, let off the lower liquid. The temperature was lowered to 100°C, and then hexafluoroacetone trihydrate (3.3g, 15mmol) was added dropwise to the three-necked flask for 1 hour; the temperature was raised to 140°C, refluxed for 35h, and after the liquid in the water separator was clarified and layered, let it go The l...

Embodiment 2

[0035] Preparation of nanofiltration membranes containing hexafluoroisopropanol groups:

[0036] A polyethersulfone flat ultrafiltration membrane with a molecular weight cut-off of 50,000 was used as the base membrane, the base membrane was fixed, and immersed in the aqueous phase solution for 5 minutes; the excess aqueous phase solution on the membrane surface was removed, and a single-sided interfacial polymerization reaction was carried out with the organic phase solution. The reaction time was 10 seconds; dried in air for 3 minutes, and then heat-treated at 80° C. for 5 minutes; rinsed with deionized water for 3 times at room temperature for 20 minutes each to obtain a fluorine-containing nanofiltration membrane.

[0037] The aqueous solution contains 1% fluorine-containing monomer 2,2'-bis(1-hydroxy-1-trifluoromethyl-2,2,2-trifluoroethyl)-4,4'-methylenedianiline (w / v), sodium hydroxide 0.02% (w / v), triethylamine 0.5% (w / v). The oil phase solution solvent was n-hexane and...

Embodiment 3-6

[0039] As in Example 2, as described above, an aqueous solution containing 2,2'-bis(1-hydroxy-1-trifluoromethyl-2,2,2-trifluoroethyl)-4,4'-idene Methyl dianiline 1% (w / v), sodium hydroxide 0.02% (w / v), triethylamine 0.5% (w / v); the organic phase solution contains trimesoyl chloride 0.15% (w / v); Heat treatment at 80°C for 5 minutes; the interfacial polymerization times are 5, 20, 30, and 45 seconds, respectively. The desalination performance was tested under the conditions of 1000 ppm sodium sulfate aqueous solution, operating pressure of 0.6 MPa, and operating temperature of 25 °C.

[0040]

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Abstract

The invention relates to a membrane functional monomer containing a hexafluoroisopropanol group and a nanofiltration membrane preparation method thereof. A monomer which contains 1-hydroxy-1-trifluoromethyl-2,2,2-trifluoroethyl dianil compound as a nanofiltration membrane is designed and synthesized. The fluorine-containing nanofiltration membrane monomers are different monomers obtained from the reaction of a 4, 4'-dianil compound containing different substituent groups and hexafluoroacetone trihydrate. The nanofiltration membrane preparation method comprises the following steps of: fixing a basement membrane; soaking the basement membrane into a fluorine-containing monomer aqueous-phase solution; removing the superfluous aqueous-phase solution on the membrane surface, and then performing single interfacial polymerization on the basement membrane and a polybasic acyl chloride solution; drying for 1-5 minutes in air; performing heat treatment at 40-100 DEG C for 2-15 minutes; and rinsing, thereby obtaining the fluorine-containing nanofiltration membrane. The nanofiltration membrane preparation method has the advantages that the prepared fluorine-containing nanofiltration membrane has an excellent effect of retaining bivalent cations and anions and has ultrahigh property for resisting oxidation of free chlorine.

Description

【Technical field】 [0001] The invention relates to the technical field of fine chemicals, in particular to a membrane functional monomer containing a hexafluoroisopropanol group and a preparation method of a nanofiltration membrane. 【Background technique】 [0002] Only about 0.01% of the world's total water is currently available for human use, exacerbating the clean water crisis on a global scale, and people are looking for ways to get usable water. As a new technology in seawater desalination and wastewater treatment, membrane separation technology has very broad development and application prospects, and it has become one of the most ideal means for human beings to obtain high-quality water resources. Nanofiltration membrane is a new type of separation membrane that came out in the late 1980s. Among them, the nanofiltration membrane made of polyaromatic amides has excellent pressure resistance, thermal stability and chemical stability, and is suitable for seawater and high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82
Inventor 钱旭红许振良曹松胡登申丽魏永明吴明熹
Owner EAST CHINA UNIV OF SCI & TECH
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