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Hollow fiber nanofiltration membrane and preparation method thereof

A nanofiltration membrane and fiber technology, applied in the field of membrane separation, can solve the problems of unfavorable large-scale industrial production, high material cost, complex production process, etc., and achieve the effects of shortening production time, simple process and economic cost

Active Publication Date: 2010-09-29
SUZHOU FAITH HOPE MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The nanofiltration membranes of the above-mentioned patents are respectively prepared by the interface coating method or the interface polymerization method in the composite method. Because of the characteristics of these two methods, the production process is relatively complicated, and the cost of materials involved in coating or polymerization is high. It takes a long time to complete the chemical compounding process, which is not conducive to continuous large-scale industrial production

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  • Hollow fiber nanofiltration membrane and preparation method thereof
  • Hollow fiber nanofiltration membrane and preparation method thereof
  • Hollow fiber nanofiltration membrane and preparation method thereof

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specific Embodiment ( 1

[0028] The device used in the preparation method of a hollow fiber nanofiltration membrane of the present invention is as figure 1 As shown, it includes casting liquid channel 1, core liquid channel 4, gear pump 2, gear pump 3, spinneret 6, coagulation bath 8, and wire winding wheel 9. figure 1 The structural representation of the middle spinneret 6 is shown in figure 2 , including a casting solution channel 7, a core solution channel 5, a core solution port 12, and a casting solution port 11.

[0029] Casting liquid channel 1 is connected with gear pump 2 and connected with casting liquid channel 7 in spinneret 6, core liquid channel 4 is connected with gear pump 3 and connected with core liquid channel 5 in spinneret 6; 7 is connected to each other, and the core liquid channel 5 is connected to the core liquid port 12; it is located on the same axisymmetric center as the casting liquid port 11, and the diameter of the core liquid port 12 is smaller than the diameter of the...

specific Embodiment ( 2

[0040] The device that the present invention adopts is the same as embodiment (one), and the preparation steps of the hollow fiber nanofiltration membrane of the present embodiment are:

[0041] a) Configuration of casting solution:

[0042] The polyacrylonitrile (PAN) high polymer with a molecular weight of 30,000 to 50,000, N,N-dimethylformamide (DMF) and the pore size regulator polyvinylpyrrolidone (PVP) are mixed according to the mass percentage of 18:65:17wt% production;

[0043] b) Preparation of polyacrylonitrile (PAN) ultrafiltration base membrane:

[0044] Water is injected into the core liquid channel 5 of the spinneret 6 from the core liquid channel 4 through the gear pump 3, and the film casting liquid prepared by step a) is injected into the film casting of the spinneret 6 from the film casting liquid channel 1 through the gear pump 2 Liquid channel 7; Then, simultaneously through the core liquid mouth 12 of diameter 0.7mm and the casting film mouth 11 of diamet...

specific Embodiment ( 3

[0048] The device that the present invention adopts is the same as embodiment (one), and the preparation steps of the hollow fiber nanofiltration membrane of the present embodiment are:

[0049] a) Configuration of casting solution:

[0050] Solvent A prepared by mixing polyacrylonitrile (PAN) polymer with a molecular weight of 30,000 to 50,000, dimethyl sulfoxide (DMSO) and tetrahydrofuran (THF) at a volume ratio of 1:1 and pore size regulator diethylene glycol (DG) mixed according to mass percentage 26:72:2wt%;

[0051] b) Preparation of polyacrylonitrile (PAN) ultrafiltration base membrane:

[0052] Water is injected into the core liquid channel 5 of the spinneret 6 from the core liquid channel 4 through the gear pump 3, and the film casting liquid prepared by step a) is injected into the film casting of the spinneret 6 from the film casting liquid channel 1 through the gear pump 2 Liquid channel 7; Then, simultaneously through the core liquid mouth 12 of diameter 1.6mm a...

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Abstract

The invention relates to a hollow fiber nanofiltration membrane. A polyacrylonitrile (PAN) ultrafiltration membrane is used as a basal membrane and the hollow fiber nanofiltration membrane is prepared by performing alkali wash, acid wash and amination sequentially by the chemical composite method, wherein the effective aperture of a membrane pore is 0.5 to 2 nanometers, the internal diameter of a membrane yarn is 0.5 to 1 mm and the external diameter of the membrane yarn is 1 to 1.6 mm. Without the processes of interface coating, or polymerization, and crosslinking, the hollow fiber nanofiltration membrane is prepared by utilizing low-price acid and alkali and through the simple acid washing and alkali washing processes, so that the use of high-cost polymeric materials is avoided, the production time is shortened; and the basal membrane is subjected to chemical combination to generate the nanofiltration membrane through simple process and in economical cost and short time.

Description

Technical field: [0001] The invention belongs to the technical field of membrane separation, and relates to a method for preparing a charged hollow fiber nanofiltration membrane through a chemical composite method. Background technique: [0002] Nanofiltration membrane is a new type of membrane separation technology that has developed rapidly in the world in recent years. The traditional preparation technology of nanofiltration membrane is similar to the preparation of reverse osmosis membrane, mainly including phase inversion method, blending method, surface charge method and composite method. The composite method is currently the most used and most effective method for preparing nanofiltration membranes, and it is the method for producing commercial nanofiltration membranes with the most varieties and the largest yield. [0003] The compounding method includes the preparation of the base film and the preparation and compounding of the ultra-thin skin layer. Usually, the ...

Claims

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Application Information

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IPC IPC(8): B01D71/42B01D67/00B01D69/08
Inventor 杨乾王开宇李屹肖有昌
Owner SUZHOU FAITH HOPE MEMBRANE TECH
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