Preparation process of nanofiltration composite membrane
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A preparation process, composite membrane technology, applied in membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc.
Active Publication Date: 2021-09-10
HUNAN KEENSEN TECH CO LTD
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[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 ...
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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, wherein the preparation process comprises the steps: firstly, compounding an aqueous phase solution on a non-woven fabric composite bottom membrane, and then compounding an oil phase solution to obtain a semi-finished product; performing heat treatment on the semi-finished product obtained in the step 1 through a drying oven, and controlling the membrane surface temperature of an outlet of the drying oven after heat treatment by adjusting the air speed and temperature of the drying oven to obtain the nanofiltration composite membrane, wherein the temperature of the membrane surface at the outlet of the drying oven is 20-30 DEG C. According to the preparation process, the membrane flux can be remarkably improved under the condition that the desalination rate of the composite nanofiltration membrane is not greatly reduced, and the problems that the water flux is generally low and the separation efficiency cannot be effectively improved in an existing NF membrane are effectively solved. Meanwhile, according to the preparation process provided by the invention, a reaction system is not greatly changed as much as possible, the variation of related matching parameters is small, the debugging period is short, the process application prospect is good, and the preparation process 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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