Preparation method of uni-endodermis hollow fiber infiltrating and vaporizing membrane

A technology of pervaporation membrane and endothelial layer, applied in the field of membrane separation, can solve technical problems and other problems

Inactive Publication Date: 2008-10-15
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is of great significance to develop the preparation technology of single-endothelial hollow fiber pervaporation membrane, but it is also a technical problem.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0024] Single-endothelial hollow fiber support membrane is spun by dry / wet phase conversion method, polyacrylonitrile (PAN) material, internal diameter 1.1mm, molecular weight cut off 20000, polycation material used is linear polyethyleneimine (PEI, molecular weight is 6 Ten thousand).

[0025] Assembly conditions and methods:

[0026] (1) Polyethyleneimine is made into a 0.5wt% solution with deionized water, and left to defoam;

[0027] (2) In order to charge the surface of the polyacrylonitrile support membrane, conventional hydrolysis modification technology is adopted. Firstly, when the temperature is 65 ° C, the polyacrylonitrile ultrafiltration membrane is immersed in 2N NaOH solution for 15 minutes, and it is modified into Hollow fiber polyanion base membrane;

[0028] (3) soak the membrane in deionized water, rinse the membrane surface and dry;

[0029] (4) Put the hollow fiber base membrane into a plexiglass tube, and seal both ends with epoxy resin to make a hollo...

specific Embodiment 2

[0034] Adopt dry / wet phase inversion method to spin single-endothelial hollow fiber support membrane, polyacrylonitrile (PAN) material, internal diameter 1.1mm, molecular weight cut off 60000, polycationic material used is linear polyethyleneimine (PEI, molecular weight is 6 Ten thousand), the polyanion is polyacrylic acid (PAA, molecular weight is 4 million).

[0035] Assembly conditions and methods:

[0036] (1) Polyethylenimine is made into a 0.5wt% solution with ethanol, and left standing for defoaming

[0037] (2) In order to charge the surface of the polyacrylonitrile support membrane, conventional hydrolysis modification technology is adopted. Firstly, when the temperature is 65 ° C, the polyacrylonitrile ultrafiltration membrane is immersed in 2N NaOH solution for 15 minutes, and it is modified into Hollow fiber polyanion base membrane;

[0038] (3) soak the membrane in deionized water, rinse the membrane surface and dry;

[0039] (4) Put the hollow fiber base membr...

specific Embodiment 3

[0044] Adopt dry / wet phase inversion method to spin single-endothelial hollow fiber support membrane, polyacrylonitrile (PAN) material, internal diameter 1.1mm, molecular weight cut off 60000, polycationic material used is linear polyethyleneimine (PEI, molecular weight is 6 Ten thousand), the polyanion is polyacrylic acid (PAA, molecular weight is 4 million).

[0045] Assembly conditions and methods:

[0046] (1) Polyacrylic acid is made into a 0.05wt% solution with deionized water, polyethyleneimine is made into a 0.5wt% solution with deionized water, and left to defoam

[0047] (2) In order to charge the surface of the polyacrylonitrile support membrane, conventional hydrolysis modification technology is adopted. Firstly, when the temperature is 65 ° C, the polyacrylonitrile ultrafiltration membrane is immersed in 2N NaOH solution for 15 minutes, and it is modified into Hollow fiber polyanion base membrane;

[0048] (3) soak the membrane in deionized water, rinse the memb...

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Abstract

The invention relates to a method for preparing a single-endoderm hollow fiber pervaporation membrane, and belongs to the membrane separation field. The pervaporation membrane has very strict requirement on the integrity and the compactness of a separating layer, and the existing dry-wet phase inversion method is difficult to directly prepare the flawless hollow fiber pervaporation membrane. Because the inside diameter of a hollow fiber membrane ranges from 0.5 to 1.5mm commonly, a coating method is hard to be directly adopted to compound the separating layer to the inner surface of fiber. Therefore, the preparation of the single-endoderm hollow fiber pervaporation membrane is a technical difficult problem. In the method for preparing the single-endoderm hollow fiber pervaporation membrane, a recycle pump is utilized to pump polycation and polyanion solution to a hollow fiber inner-cavity alternately and repeatedly; a certain negative pressure is exerted outside the fiber to form a vacuum side to realize that polyion solution is filtered under the negative pressure, thereby forming a composite layer with certain separated function on the inner surface of the hollow fiber. Pervaporation experiment shows that the preparation method can be utilized to prepare the single-endoderm hollow fiber pervaporation membrane with high performance.

Description

technical field [0001] The invention relates to a preparation method of a single-endothelial hollow fiber pervaporation membrane, which belongs to the technical field of membrane separation. Background technique [0002] Pervaporation is a separation process that relies on the different dissolution and diffusion rates of components in the mixture to achieve separation. According to the structure of the membrane, pervaporation membranes can be divided into: homogeneous membranes and composite membranes. Among them, the composite membrane is made by covering a dense active skin layer on a porous support layer. The support layer is usually an asymmetric ultrafiltration membrane, and the active skin layer mainly plays a role in separation. In the field of pervaporation, plate and frame membrane modules currently occupy a dominant position. Compared with plate and frame membrane modules, hollow fiber pervaporation membrane modules have the following advantages: high packing dens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08
Inventor 张国俊纪树兰宋雪王乃鑫刘忠洲
Owner BEIJING UNIV OF TECH
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