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Preparation method of polyamide reverse osmosis membrane containing amphoteric carboxymethylcellulose sodium complex

A technology of sodium carboxymethyl cellulose and reverse osmosis membrane, applied in the field of preparation of polyamide reverse osmosis membrane, to achieve good pollution resistance, high water permeability and pollution resistance, and improve transmission efficiency

Active Publication Date: 2015-09-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the complexity and diversity of practical application systems require further improvement in the separation, permeability and pollution resistance of reverse osmosis membranes.

Method used

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Examples

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Effect test

preparation example Construction

[0015] The preparation method of the polyamide reverse osmosis membrane containing amphoteric sodium carboxymethyl cellulose complex comprises the steps:

[0016] (1) Dissolve 10-30 parts by mass of zwitterionic monomers and 5-10 parts by mass of cationic monomers in an aqueous solution of 50-200 parts by mass, blow nitrogen into it, and add 0.1-1 parts by mass of water-soluble initiator , at 40-60 o Polymerize at C for 6-12 hours, precipitate the polymer with acetone, and wash it several times to obtain an amphoteric cationic polymer, which is vacuum-dried for later use;

[0017] (2) Dissolve 1-3 parts by mass of sodium carboxymethylcellulose and 0.5-2 parts by mass of amphoteric cationic polymer in 100-500 parts by mass of acidic aqueous solution, and then add the acidic aqueous solution of amphoteric cationic polymer dropwise Carry out ionic cross-linking in the acidic aqueous solution of sodium carboxymethyl cellulose, after precipitation, wash with deionized water severa...

Embodiment 1

[0022] 10 g of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonic acid inner salt and 5 g of methacrylic acid Dissolve acyloxyethyltrimethylammonium chloride in 50 g of aqueous solution, pass through nitrogen, add 0.1 g of potassium persulfate and sodium bisulfite (mass ratio is 1:1), at 40 o C was polymerized for 12 hours, precipitated with acetone, washed several times, and dried in vacuum to obtain an amphoteric cationic polymer; 1 g of sodium carboxymethylcellulose and 0.5 g of amphoteric cationic polymer were dissolved in 100 g of 0.01wt% hydrochloric acid aqueous solution, then the amphoteric cationic polymer acidic aqueous solution is added dropwise in the sodium carboxymethyl cellulose acidic aqueous solution to carry out ion cross-linking, after precipitation, washed with deionized water several times, at 40 o C was dried for 16 hours to obtain the amphoteric sodium carboxymethylcellulose complex; then the above-mentioned 0.2 g complex was a...

Embodiment 2

[0024] 30 g of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonic acid inner salt and 10 g of methacrylic acid Dissolve acyloxyethyltrimethylammonium chloride in 200 g of aqueous solution, pass through nitrogen, add 1 g of potassium persulfate and sodium bisulfite (mass ratio: 1:1), at 60 o C was polymerized for 6 hours, precipitated with acetone, washed several times, and vacuum-dried to obtain an amphoteric cationic polymer; 3 g of sodium carboxymethylcellulose and 2 g of amphoteric cationic polymer were dissolved in 500 g of 0.1wt% hydrochloric acid aqueous solution, and then the amphoteric cationic polymer acidic aqueous solution is added dropwise in the sodium carboxymethyl cellulose acidic aqueous solution to carry out ion cross-linking, after precipitation, washed with deionized water several times, at 60 o C was dried for 8 hours to obtain the amphoteric sodium carboxymethylcellulose complex; then the complex of the above 1 g was added to 500...

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Abstract

The invention discloses a preparation method of a polyamide reverse osmosis membrane containing an amphoteric carboxymethylcellulose sodium complex. The preparation method comprises the steps: firstly, preparing an amphoteric cationic polymer by a free radical polymerization method, then preparing an amphoteric carboxymethylcellulose sodium complex by an ionic crosslinking method, adding the amphoteric carboxymethylcellulose sodium complex into an aqueous phase monomer solution for preparing a polyamide membrane, and thus obtaining the polyamide reverse osmosis membrane containing the amphoteric carboxymethylcellulose sodium complex through an interfacial polymerization method. With utilization of good hydrophilicity, contamination resistance and a unique nanoparticle structure of the amphoteric carboxymethylcellulose sodium complex, the water permeation flux and contamination resistance of the membrane are greatly improved while the high salt interception rate of the polyamide membrane on an inorganic salt is kept. Under an operating pressure of 1.5 MPa at the temperature of 25 DEG C, the interception rate of the reverse osmosis membrane on NaCl is more than 97%, and the water permeation flux is more than 30 L.m<-2>.h<-1>. Therefore, the prepared polyamide reverse osmosis membrane containing the amphoteric carboxymethylcellulose sodium complex has high salt interception rate, water permeability and contamination resistance.

Description

technical field [0001] The invention belongs to the field of reverse osmosis membrane separation, and in particular relates to a preparation method of a polyamide reverse osmosis membrane containing amphoteric sodium carboxymethylcellulose complex. Background technique [0002] Membrane separation technology has the characteristics of high efficiency, energy saving, environmental protection, and wide application range, and has become an effective means of seawater desalination and sewage treatment. Common membrane separation technologies include microfiltration, ultrafiltration, nanofiltration, reverse osmosis, pervaporation, and membrane bioreactors. Among them, reverse osmosis, as one of the earliest industrialized membrane separation technologies, has been widely used in the field of seawater desalination. The reverse osmosis composite membrane is usually composed of a porous support layer and a dense separation skin. Compared with asymmetric membranes, It has high perme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/56B01D67/00B01D69/02C02F1/44
Inventor 安全福计艳丽马蓉高从堦
Owner ZHEJIANG UNIV
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