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Novel polyamide nanofiltration membrane and preparation method thereof

A technology of polyamide and nanofiltration membranes, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve good hydrophilicity and chlorine resistance, high removal rate, and novel preparation methods

Inactive Publication Date: 2010-09-15
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although nanofiltration technology has made great progress, the existing membrane materials cannot meet people's needs. Under the condition of not losing the rejection rate, the flux of the membrane needs to be further improved, and new monomers and new materials are needed. the emergence of

Method used

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  • Novel polyamide nanofiltration membrane and preparation method thereof
  • Novel polyamide nanofiltration membrane and preparation method thereof
  • Novel polyamide nanofiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Use 16% Udel P3500 polysulfone, 0.3% water and 0.1% nonylphenol polyoxyethyl ester phosphate to dissolve N, N-dimethylacetamide, apply it on the polyester non-woven fabric, and then dip it into After gelling in water and removing the solvent, a support membrane with a molecular weight cut-off of 20,000-30,000 is obtained, which is stored in a wet state for future use.

[0034] Immerse one side of the wet polysulfone support membrane in an aqueous solution with a weight ratio of 0.1% of piperidine and a weight ratio of 0.25% of sodium hydroxide for two minutes, roll the surface of the support membrane with a rubber roller and squeeze it dry, and mix with the weight of aromatic acid The isopar solvent oil solution with a ratio of 0.1% is contacted on one side to carry out the interfacial polymerization reaction for 20-40 seconds, the composite film is dried in the air for 2 minutes, and then treated at 40-70° C. for 3-10 minutes. Then carry out two steps of rinsing again:...

Embodiment 2-9

[0039] Other conditions are all the same as in Example 1, and the ratio of TMC and CSIC in the mixture solvent oil solution of 5-sulfonyl chloride isopeptidyl chloride and trimesoyl chloride is changed, and the results are shown in Table 2

[0040] Table 2

[0041]

[0042]

[0043] CSIC in the present invention refers to 5-chlorosulfonyl chloride isophthaloyl chloride, and isopar solvent oil is C11-C13 aliphatic hydrocarbon solvent oil.

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PUM

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Abstract

The invention discloses a polymeric membrane and a preparation method thereof, in particular to a polyamide nanofiltration membrane and a preparation method thereof. The membrane comprises a porous support layer membrane and a polyamide ultrathin functional layer, wherein the polyamide ultrathin functional layer simultaneously contains sulfonyl amino, amide, carboxylic and sulfonic functional groups. The preparation method comprises the following step of compounding an aromatic polyamide ultrathin functional layer on a polysulfone support membrane through the interfacial polycondensation between aromatic polyhydric acyl chloride or other aromatic polyhydric acyl chloride mixture with modified acyl chloride groups on aromatic rings and a 4-amino piperidine water solution. The invention has the advantages that: the preparation method is novel and simple; and the nanofiltration membrane has better hydrophilcity and chlorine resistance and keeps higher removal ratio to bivalent ions while maintaining higher reflux. The invention has wide application in liquid separation industry.

Description

technical field [0001] The invention relates to a polymer membrane and a preparation method, in particular to a polyamide nanofiltration membrane and a preparation method. technical background [0002] Nanofiltration membrane is a new membrane separation technology between ultrafiltration and reverse osmosis. Its technical feature is to achieve selective permeation of dissolved components through steric hindrance and electrostatic interaction, and the pressure of the operating system is much lower than that of the reverse osmosis process (operating pressure is usually 0.4-1MPa), and the nanofiltration membrane is resistant to divalent ions The rejection rate of solutes with a molecular weight greater than 200 is greater than 90%, while the rejection rate of monovalent ions and low molecular weight solutes is generally lower than 50%, thus achieving selective separation of substances. The chargeability, ion valence and concentration of the material have a great influence on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/10B01D69/12
Inventor 周勇翟丁高从堦
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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