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Self-microporous high-flux nano-filtration composite membrane and preparation method thereof

A high-throughput, composite membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as self-microporous nanofiltration membranes that have not been reported

Inactive Publication Date: 2019-02-01
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, self-microporous nanofiltration membranes used in the field of water treatment have not been reported.

Method used

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  • Self-microporous high-flux nano-filtration composite membrane and preparation method thereof
  • Self-microporous high-flux nano-filtration composite membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for preparing a self-microporous high-throughput nanofiltration composite membrane, comprising the steps of:

[0030] (1) Dissolve 6,6'-dihydroxy-3,3,3',3'-tetramethyl-1,1'-spirobisindane in NaOH aqueous solution at pH=13 to obtain a mass concentration of 1 % solution is solution one, dissolving piperazine in water to obtain a solution with a mass concentration of 1% is solution two, and the volume ratio is 1:1, and solution one and solution two are mixed to obtain a mixed solution (aqueous phase solution);

[0031] (2) Soak the polysulfone ultrafiltration membrane in the mixed solution, soak for 5 minutes, take it out, and dry the soaked polysulfone ultrafiltration membrane upper surface with an air knife;

[0032] (3) soak the upper surface of the membrane that step (2) obtains with the trimesoyl chloride n-hexane solution (oil phase solution) that contains mass concentration of 0.1%, (make the water phase solution in the polysulfone ultrafiltration membrane ...

Embodiment 2

[0040] A method for preparing a self-microporous high-throughput nanofiltration composite membrane, comprising the steps of:

[0041] (1) Dissolve 5,5’,6,6’-tetrahydroxy-3,3,3’,3’-tetramethyl-1,1’-spirobisindane in Ca(OH) at pH=9 2 In the aqueous solution, the solution with a mass concentration of 0.1% is solution one, and the solution with a mass concentration of 0.1% obtained by dissolving divinyltriamine in water is solution two. The volume ratio is 1:9, and the solution one and solution two Mix to obtain a mixed solution (water phase solution);

[0042] (2) Soak the polysulfone ultrafiltration membrane in the mixed solution, soak for 1 min, take it out, and roll the soaked polysulfone ultrafiltration membrane upper surface dry with a rubber roller;

[0043] (3) soak the upper surface of the membrane that step (2) obtains with the terephthaloyl chloride cyclohexane solution (oil phase solution) that contains mass concentration 0.01%, (make the aqueous phase solution in the p...

Embodiment 3

[0047] A method for preparing a self-microporous high-throughput nanofiltration composite membrane, comprising the steps of:

[0048] (1) Dissolve 2,8-dihydroxy-6H,12H-5,11methylenedibenzo[b,f][1,5]diazepine in KOH / NaOH (KOH The mass ratio with NaOH is 1:1) in the aqueous solution, the solution that obtains mass concentration is 5% is solution one, and 1,2-diaminocyclohexane is dissolved in water and obtains the solution that mass concentration is 5% and is solution two, According to the volume ratio of 9:1, the solution 1 and the solution 2 are mixed to obtain a mixed solution (aqueous phase solution);

[0049] (2) Soak the polyethersulfone ultrafiltration membrane in the mixed solution, soak for 60 minutes, take it out, and dry the upper surface of the soaked polyethersulfone ultrafiltration membrane with an air knife;

[0050] (3) Soak with a multifunctional organic acid chloride n-heptane solution containing a mass concentration of 1% (the multifunctional organic acid chl...

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Abstract

The invention discloses a self-microporous high-flux nano-filtration composite membrane and a preparation method thereof. The preparation method comprises: (1) dissolving a polyfunctional organophenolhaving a rigid twist structure in an alkali aqueous solution to obtain a solution 1, dissolving a polyfunctional organic amine in water to obtain a solution 2, and mixing the solution 1 and the solution 2 to obtain a mixed solution; (2) immersing an ultra-filtration support layer in the mixed solution, soaking, taking out, carrying out blow drying, soaking the upper surface of the membrane by using a polyfunctional organic acyl chloride solution, placing, and pouring off; and (4) carrying out heat treatment to obtain the product. According to the present invention, the polyfunctional organophenol having the rigid twist structure is introduced into the interfacial polymerization reaction, and the stacking of the molecular chain segments during the film forming is hindered by the special molecular structure, such that the separation layer of the prepared microporous high-flux nano-filtration composite membrane has a large number of micro-pores; with the method, the defects caused by theaddition of nanometer materials in the prior art are overcome; the product has advantages of good hydrophilicity, high water flux and high retention; and the method has advantages of simple operationand low cost.

Description

technical field [0001] The invention relates to a self-microporous high-throughput nanofiltration composite membrane and a preparation method thereof. Background technique [0002] With the increasingly serious water pollution problem and the increasing demand for water, the shortage of clean water resources has become a world problem. Membrane separation, a new type of separation technology, has the advantages of low cost, low energy consumption, easy operation and small footprint. Membrane separation technology provides an environmentally friendly and economical way to solve the problem of water shortage, so it has gradually become a research hotspot. Nanofiltration, a typical pressure-driven membrane separation process, has been widely studied and applied to industrial wastewater due to its high rejection rate of high-valent salts and organic matter, high water flux and low operating pressure treatment, drinking water production and desalination of brackish water. At p...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D69/10B01D67/00
CPCB01D67/0002B01D67/0006B01D69/10B01D69/125
Inventor 牛青山蒋驰田蕾侯影飞
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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