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
CN101829508AInactive Publication Date: 2010-09-15HANGZHOU WATER TREATMENT TECH DEV CENT
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HANGZHOU WATER TREATMENT TECH DEV CENT
Publication Date
2010-09-15
Estimated Expiration
Not applicable · inactive patent

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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.
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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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