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Method for preparing multilayer polyamide composite film

A composite membrane and polyamide technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of rare research and application of PA membranes for pervaporation, and achieve rapid polycondensation reaction process, The effect of good structure compactness and simple preparation process

Inactive Publication Date: 2007-04-25
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still little research and application of PA membranes for pervaporation.

Method used

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  • Method for preparing multilayer polyamide composite film
  • Method for preparing multilayer polyamide composite film
  • Method for preparing multilayer polyamide composite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The PA composite membrane that commercial RO is used is soaked in 2.5wt% m-phenylenediamine (m-PDA) aqueous solution prepared with deionized water for 20 minutes, taken out and dried, and then prepared with normal hexane Soak in 0.8wt% trimesoyl chloride (TMC) n-hexane solution for 20 seconds, take it out and place it at room temperature at 25°C to dry for about 5 minutes, and repeat the above operation 5 times. A brown multilayer polyamide composite film was obtained.

[0056] According to the PV test, the performance of the multi-layer PA composite membrane for separating isopropanol-water mixture is: permeation flux 92.53g / m 2 · h, the water content in the permeate is 37.70wt%.

Embodiment 2

[0058] As in the process steps of Example 1, wherein only the PA composite film soaked in the organic monomer solvent is changed and heat-treated under an infrared lamp at 40° C., the performance of the obtained multilayer PA composite film PV separating isopropanol water mixture is : Permeation flux 27.60g / m 2 h, the water content in the permeate is 95.57wt%.

Embodiment 3

[0060] The remaining conditions are the same as in Example 2, except that the heat treatment temperature is changed to 70°C, and the performance of the obtained modified multilayer PA composite membrane PV to separate isopropanol water mixture is: permeation flux 21.82g / m 2 h, the water content in the permeate is 96.08wt%.

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Abstract

The invention relates to a method for preparing multilayer polyamide composite film. Wherein, it emerges polyamide composite film (PA) used in reverse osmosis (RO) in the water solution of 0.5-2.5wt% m-phenylenediamine for 10-30min; then emerges it in the skellysolve B solution whose mesitylene chlorine density is 0.3-1.0wt% for 10-30s; then croslinking it to form one layer of PA film; repeats, to obtain the multilayer PA composite film. The multilayer PA composite film with 5 times of polycondensation separates PV on the water mixture whose alcohol isopropylicum density is 88.2%, the water content of osmosis material can reach 51.04-97.53%, the osmosis flux can reach 25.66-575.85g / m2, while the reaction is quick. The invention has simple process.

Description

technical field [0001] The invention relates to the preparation of a multi-layer polyamide (PA) composite film through macromolecule chemical reaction. Specifically, it is a method for preparing a pervaporation (PV) separation membrane by using a PA composite membrane for water treatment reverse osmosis (RO) desalination through multiple interfacial polycondensation processes. The multilayer polyamide (PA) composite membrane is used as a PV separation membrane for organic aqueous solution. Background technique [0002] Polyamide (PA) is a separation membrane material with excellent performance. Reverse osmosis (RO) membranes for industrial production of water treatment and desalination through the composite membrane process are mature and widely used. However, the research and application of PA membranes for pervaporation are still rare. [0003] "Desalination" (No. 148: 43-48, 2002) and "Journal of Membrane Science" (No. 185: 193-200, 2001) reported the use of 2,2-bis[4-...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/12
Inventor 蔡邦肖
Owner ZHEJIANG GONGSHANG UNIVERSITY