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Hollow fiber anion-exchange membrane and preparation method thereof

An anion exchange membrane, hollow technology, used in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. Not easy to spin, the effect of uniform structure

Inactive Publication Date: 2008-10-15
UNIV OF SCI & TECH OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the widespread use of plate-and-frame modules based on flat anion exchange membranes, the effective mass transfer area per unit volume is small, the processing capacity is limited, the membrane modules are heavy, and it is inconvenient to use and transport, resulting in high cost and large cost. Area promotion is difficult
[0003] Chinese patents ZL97107831.9, ZL02136109.6, ZL96110094.X, ZL95193838.X, 02803318.3 and CN1817425A are mainly composed of polyolefin, polysulfone, polyethersulfone Hollow fiber membranes prepared by neutral materials such as polyvinylidene fluoride or polyvinyl alcohol through thermally induced phase inversion or dry-wet phase inversion can only be used for microfiltration, ultrafiltration and nanofiltration because they are not charged. Isopressure-driven membrane processes
However, this method requires the use of expensive devices such as irradiation and plasma in the grafting process, and the grafting is only carried out on the surface of the porous membrane. The physical structure and properties of the membrane depend to a large extent on the structure of the base fiber. The types are also very limited, making it difficult for this process to be developed on a large scale
[0004] Holland "Journal of Membrane Science" (Journal of Membrane Science 281 (2006) 397-409) reported that on commercial polypropylene hollow fiber microporous membranes, cross-linking and immobilization by soaking poly-4-vinylpyridinium salt and cross-linking agent mixed solution Quaternization is used to obtain hollow fiber anion exchange membranes for water softening. The chemical reagents used in this method are very expensive, and the prepared mixed solution will soon cross-link and affect the absorption, and the group distribution is uneven; The main body of the basement membrane is not chemically bonded, and some groups will be lost in use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021]Preparation of hollow fiber base membrane: dissolving brominated polyphenylene ether with a methyl bromination degree of 60% in N-methylpyrrolidone to prepare a spinning solution with a polymer mass concentration of 20%, and the spinning solution After filtering, put it into the slurry tank, adopt the dry jet wet spinning method to form, adjust the control frequency of the slurry metering pump to 17Hz, control the spinning pressure at 0.2-0.4MPa, and the spinning solution is extruded from the spinneret composed of two concentric tubes , after a 500mm dry spinning process, solidify in a water bath with a temperature of 15-50°C, the filling liquid in the spinneret cavity is water, the flow rate is 0.1-0.3ml / min, and the control frequency of the winding speed is 7Hz, and the obtained A hollow fiber base membrane with a thickness of 170 μm and an inner diameter of 350 μm.

[0022] Preparation of hollow fiber anion exchange membrane: take out the hollow fiber base membrane pr...

Embodiment 2

[0026] Preparation of hollow fiber base membrane: Dissolve brominated polyphenylene ether with methyl bromination degree of 90% and benzene ring bromination degree of 20% in dimethylformamide to prepare a polymer with a mass concentration of 38%. Spinning solution, the spinning solution is filtered and added to the slurry tank, formed by dry jet wet spinning, the control frequency of the slurry metering pump is adjusted to 28Hz, the spinning pressure is controlled at 0.2-0.4Pa, and the spinning solution is obtained from two The spinneret composed of concentric tubes is extruded, and after a dry spinning process of 500mm, it is solidified in a water bath at a temperature of 28-31°C. The filling liquid in the spinneret cavity is water, and the flow rate is 0.1-0.3ml / min. The control frequency of the wire speed was 14 Hz, and a hollow fiber base membrane with a thickness of 400 μm and an inner diameter of 1000 μm was obtained.

[0027] Preparation of hollow fiber anion exchange m...

Embodiment 3

[0031] Using the same operation process as in Example 2, but changing the mass concentration of the polymer to 60%, a film with a similar structure can be obtained.

[0032] Structural and performance tests were carried out on the hollow fiber anion exchange membrane prepared above in this example. The composition of the membrane is quaternized brominated polyphenylene ether, the degree of bromination of the benzene ring is 20%, and the degree of methyl bromination is 37%. %; the thickness of the hollow fiber membrane is 600 μm, the inner diameter is 1200 μm, the anion exchange capacity is 2.40 mmol / g-dry membrane, and the water content is 80%.

[0033] Since the hollow fiber type homogeneous anion exchange membrane product of the present invention has higher anion exchange capacity and water content, it can be used in the field of acid recovery by diffusion dialysis.

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Abstract

The invention relates to a hollow fiber anion exchange membrane and a preparation method thereof, and is characterized in that bromide polyphenylether is dissolved in organic solvent to obtain spinning solution the polymer mass concentration of which is 20 to 60 percent; then a dry-jet wet spinning is adopted for molding to obtain a bromide polyphenylether hollow fiber inophragma, wherein, the methyl bromide degree is 60 to 120 percent, and the benzene ring bromide degree is 0 to 20 percent; then the inophragma is pretreated and aminated to obtain the hollow fiber anion exchange membrane, wherein, the anion exchange capacity is 1.5 to 2.5mmol / g-dry membrane, and the water capacity is 50 percent to 90 percent. The preparation method has the advantages of simpleness, convenience, rapidity and economy, and obtains a homogeneous phase hollow fiber anion exchange membrane with different exchange capacity and stable performance through the control on the bromide polyphenylether structure, the spinning conditions, etc.; the hollow fiber anion exchange membrane has the characteristics of uniform structure, high ion exchange capacity, and strong pollution resistibility, and can be series-developed to meet the needs of different application fields.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a brominated polyphenylene ether-based hollow fiber anion exchange membrane and a preparation method thereof. Background technique [0002] According to the United States "Separation Science and Technology" (Separation Science and Technology, 37 (3), 535-554, 2002), the Netherlands "Journal of Membrane Science" (Journal of Membrane Science 281 (2006) 397-409), the Netherlands "Desalination" (Desalination 162 (2004) 129-135) and Netherlands "chromatography B" (Journal of Chromatography B, 2005, 821: 153-158)) reported that anion exchange membranes are used in desalination of seawater (brackish water), dehardening of tap water, sewage It has a wide range of applications in the recovery of useful metals, electrophoretic paint wastewater treatment, waste acid recovery, protein separation, etc. However, due to the widespread use of plate-and-frame modules based on flat ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/52B01D69/08
Inventor 徐铜文刘兆明
Owner UNIV OF SCI & TECH OF CHINA
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