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A kind of preparation technology of nanofiltration composite membrane

A preparation process and composite membrane technology, which is applied in membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., to achieve excellent comprehensive performance, improve water flux, and enhance membrane flux.

Active Publication Date: 2021-11-12
HUNAN KEENSEN TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the technical problem to be solved by the present invention is to provide a preparation process related to a nanofiltration composite membrane. The preparation process of the nanofiltration composite membrane provided by the present invention can reduce the desalination rate of the composite nanofiltration membrane significantly. , significantly improve the flux of the membrane, and at the same time try not to cause major changes to the reaction system, the change of related matching parameters is small, the debugging cycle is short, and the application prospect of process is good

Method used

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  • A kind of preparation technology of nanofiltration composite membrane
  • A kind of preparation technology of nanofiltration composite membrane

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preparation example Construction

[0039] The invention provides a preparation process of a nanofiltration composite membrane, comprising the following steps:

[0040] 1) After compounding the water phase solution on the non-woven fabric composite bottom film, and then compounding the oil phase solution, a semi-finished product is obtained;

[0041] 2) The semi-finished product obtained in the above steps is heat-treated in an oven, and the temperature of the membrane surface at the outlet of the oven is controlled by adjusting the wind speed and temperature of the oven to obtain a nanofiltration composite membrane;

[0042] The film surface temperature at the outlet of the oven is 20-30°C.

[0043] In the invention, the semi-finished product is obtained by first compounding the water phase solution on the non-woven fabric composite base film, and then compounding the oil phase solution.

[0044] In the present invention, the non-woven fabric composite base film preferably includes one or more of polysulfone, ...

Embodiment 1~9

[0093] The porous supporting membrane used is the ultrafiltration bottom membrane of polysulfone composite non-woven fabric.

[0094] Soak the base film in an aqueous phase solution containing 0.7wt% piperazine, 3wt% camphorsulfonic acid, and 0.02wt% sodium dodecyl sulfate for 10 seconds, then remove water by vacuum suction, and then pass through 42°C The heating roller further surface-dries the base film;

[0095] Then react with an oil phase solution containing 0.25wt% trimesoyl chloride in the oil phase coating area. The temperature of the oil phase solution is 50°C. After the initial reaction, it enters the HC oven for further reaction. After the reaction is completed, a layer of The PVA solution is then baked in an oven at 100°C for 2 minutes to finally form the desired finished nanofiltration membrane.

[0096] The nanofiltration composite membranes prepared in Examples 1 to 9 of the present invention were detected and process controlled.

[0097] See Table 1, Table 1 ...

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Abstract

The invention provides a preparation process of a nanofiltration composite membrane, comprising the following steps: firstly, after compounding an aqueous phase solution on a non-woven fabric composite base film, and then compounding an oil phase solution, a semi-finished product is obtained; then the semi-finished product obtained in the above steps is After heat treatment in the oven, the nanofiltration composite membrane is obtained by controlling the temperature of the membrane surface at the outlet of the oven after the heat treatment by adjusting the wind speed and temperature of the oven; the temperature of the membrane surface at the outlet of the oven is 20-30°C. This preparation process can significantly increase the flux of the membrane without greatly reducing the desalination rate of the composite nanofiltration membrane, effectively solving the problem that the existing NF membranes generally have low water flux and cannot effectively improve the separation efficiency . At the same time, the preparation process provided by the present invention does not cause major changes to the reaction system as far as possible, the relevant matching parameters have small changes, the debugging cycle is short, the technology application prospect is good, and it is more suitable for industrial production and application.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanofiltration composite membranes, and relates to a preparation process of nanofiltration composite membranes. Background technique [0002] The composite nanofiltration membrane consists of an ultra-thin separation layer and a porous support layer. At present, the porous support layer that is widely used is mainly formed by the phase inversion method of polysulfone / polyvinylpyrrolidone / DMF, and the separation layer is formed by interfacial polymerization of piperazine and trimesoyl chloride. The separation layer determines the separation performance of the composite membrane, and the porous support layer (bottom membrane) mainly provides mechanical strength. The performance of the composite membrane can be designed by changing the structural properties of the separation layer and the bottom membrane. The performance of the composite nanofiltration membrane is mainly determined by the st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D71/38B01D71/34B01D69/12B01D67/00
CPCB01D71/68B01D71/34B01D71/38B01D69/12B01D61/027B01D67/0002
Inventor 龙竞屠娇娇陈幸任朝华赵亮刘玉曾浩浩石楚道何亮
Owner HUNAN KEENSEN TECH CO LTD
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