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Preparation method of blended polyamide composite nanofiltration membrane

A composite nanofiltration membrane and polyamide technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of reducing the performance of nanofiltration membranes, poor chlorine resistance of polyamide nanofiltration membranes, etc., and achieve good Effect of water flux and retention, low price, good chlorine resistance

Active Publication Date: 2019-11-15
蓝星(杭州)膜工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Researchers have found that many different substances are used as water-phase monomers, which have a great impact on the performance of nanofiltration membranes. For example, a single piperazine, phenylenediamine or polyols are used as water-phase monomers. Nanofiltration membranes with different properties can be prepared, but due to the poor chlorine resistance of polyamide nanofiltration membranes, and because water bodies are often disinfected with sodium hypochlorite solution or chlorine gas, the residual active chlorine in the water has the opportunity to interact with polyamide nanofiltration membranes. Chlorination degradation occurs after the reaction of the amide bond formed on the filter membrane, thereby reducing the performance of the nanofiltration membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The nanofiltration membrane prepared by blending the water phase monomer prepared by blending piperazine and m-xylylenediamine in the water phase at a ratio of 4:1 was installed on a low-pressure composite membrane test bench, and then the influent was chlorinated at 500 ppm Sodium solution and 2000ppm magnesium sulfate solution were tested for their water flux and interception after pre-pressing for one hour. The test results were that the water flux of sodium chloride was 63LMH, and the desalination rate was 62.1%; the flux of magnesium sulfate was 38LMH, the desalination rate is 99.4%.

Embodiment 2

[0031] The nanofiltration membrane prepared by blending the water phase monomer prepared by blending piperazine and m-xylylenediamine in the water phase at a ratio of 3:2 was installed on a low-pressure composite membrane test bench, and then the influent water was chlorinated at 500 ppm Sodium solution and 2000ppm magnesium sulfate solution were tested for their water flux and interception after pre-pressing for one hour. The test results were that the water flux of sodium chloride was 59LMH and the desalination rate was 58%; the flux of magnesium sulfate was 42LMH, the desalination rate is 99.0%.

Embodiment 3

[0033] The nanofiltration membrane prepared by blending the water phase monomer prepared by blending piperazine and m-xylylenediamine in the water phase at a ratio of 2:3 was installed on a low-pressure composite membrane test bench, and then the influent water was chlorinated at 500 ppm Sodium solution and 2000ppm magnesium sulfate solution were tested for their water flux and interception after pre-pressing for one hour. The test results were that the water flux of sodium chloride was 52LMH, and the desalination rate was 56.1%; the flux of magnesium sulfate was 38LMH, the desalination rate is 88.1%.

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Abstract

The invention discloses a preparation method of a blended polyamide composite nanofiltration membrane. A water phase monomer is prepared by blending two monomers with different structures according toa certain ratio. The preparation method comprises following steps: preparing a water phase solution and an oil phase solution; painting the water phase solution on an ultrafiltration base membrane atfirst; after a while, removing the water phase solution on the ultrafiltration base membrane, drying the ultrafiltration base membrane in the shade; then painting the ultrafiltration base membrane bythe oil phase solution; and finally carrying out a heat treatment at a temperature of 50 to 120 DEG C to obtain a nanofiltration composite membrane that is resistant to chlorine. Compared with a nanofiltration membrane, which is prepared by interfacial polymerization between a water phase monomer and an oil phase monomer, the provided nanofiltration membrane has a better performance and a betterchlorine resistant performance. The membrane forming process is simple. The price of used medicaments is low. The commercial feasibility is higher.

Description

technical field [0001] The invention belongs to the technical field of composite nanofiltration membranes, and specifically refers to a preparation method of a blended polyamide composite nanofiltration membrane. Background technique [0002] At present, as a new type of membrane separation technology, nanofiltration has a good interception effect on divalent salts under low operating pressure, can effectively separate monovalent salts and divalent salts, and has a molecular weight of 2000 The following organic matter, due to these advantages, the preparation method and application of nanofiltration membrane has become a research hotspot. [0003] There are many methods for preparing nanofiltration membranes. For example, the immersion phase inversion method and interfacial polymerization are the most commonly used methods, while the interfacial polymerization method is the most widely used and the most used method for producing commercial nanofiltration membranes. It mainly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/12B01D67/00B01D61/02
CPCB01D71/56B01D69/12B01D67/0006B01D61/027
Inventor 刘文超陈可可洪勇琦谭惠芬林波李洪懿潘巧明
Owner 蓝星(杭州)膜工业有限公司
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