Method for preparing composite hollow fibre membrane

A fiber membrane and composite membrane technology, used in the field of preparing composite hollow fiber membranes, can solve the problems of easy biodegradation (poor biological stability, narrow pH range, poor acid and alkali resistance, etc.)

Inactive Publication Date: 2004-07-07
MEMBRANE SCI & TECH INST TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there are two major disadvantages: easy biodegradation (poor biological stability) and narrow pH range allowed (poor chemical stability, poor acid and al

Method used

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  • Method for preparing composite hollow fibre membrane
  • Method for preparing composite hollow fibre membrane
  • Method for preparing composite hollow fibre membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 4-10

[0031] i. Example 4-10 composite process conditions: polyvinyl alcohol aqueous solution 2%, water bath 60 ° C, HCl 0.2%, 15min

[0032] serial number

[0033] From the data in Table 2, it can be seen that with the increase of the concentration of glutaraldehyde, the uniformity of the reaction film formation gradually increases, the compactness of the composite membrane also increases, and the PEG-4000 rejection rate of the hollow fiber membrane increases accordingly. The permeable flux also gradually decreased. When the concentration of glutaraldehyde is about 6%, the reaction film is basically uniform, and the water permeability of the membrane is also large. When the concentration of glutaraldehyde is too high, the thickness of the composite membrane is too large, so that the water permeability of the hollow fiber membrane The drop is larger.

[0034] ii. Example 11-17 Composite process conditions: glutaraldehyde aqueous solution 6%, water bath 60°C, HCl 0.2%, 15...

Embodiment 22-28

[0040] iv. Example 22-28 Composite process conditions: PVA aqueous solution 2%, glutaraldehyde aqueous solution 6%, water bath 60°C, HCl 0.2%

[0041] serial number

[0042]From the data in Table 5, it can be seen that with the increase of the reaction time, the uniformity of the reaction film formation gradually increases, the compactness of the composite membrane also increases, the PEG-4000 rejection rate of the hollow fiber membrane increases gradually, and the water permeability of the hollow fiber membrane increases. Flux also gradually decreased. When the reaction time is about 10 minutes, the reaction film formation is basically uniform, and the water permeation flux of the film is also relatively large.

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Abstract

A process for compounding a single hydrophilic layer onto the surface of the hollow meta-fluoroethylene fibre membrane which has the double bond, hydroxy and carboxy groups on its surface features that the cross-linking agent chosen from dialdehyde, diacid and triacid is used to chemically bond the hydrophilic material chosen from cellulose, polyvinyl alcohol and chitosan onto the surface of said membrane.

Description

technical field [0001] The invention relates to a method for preparing composite hollow fiber membranes, and also relates to a method for preparing composite hollow fiber membranes using single-layer composite technology. Background technique [0002] Hollow fiber membranes are mainly used for filtration or dialysis in various fields. [0003] In order to improve the performance of the hollow fiber membrane, improve the anti-pollution and selective separation effect of the membrane, various attempts have been made in the prior art: [0004] 1. Chinese patent publication CN1224730A records that the surface of polyvinylidene fluoride base film or polyvinylidene fluoride blend base film is modified by chemical reaction or radiation to form C=C, -OH, -COOH, - COOR or free radicals, and then the method of grafting the surface-activated base film with functional macromolecules or polymer monomers to form a composite layer; [0005] 2. Chinese patent publication CN1128176A descri...

Claims

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Application Information

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IPC IPC(8): B01D69/08B01D69/12
Inventor 吕晓龙
Owner MEMBRANE SCI & TECH INST TIANJIN POLYTECHNIC UNIV
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