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Method for preparing carboxymethylcellulose sodium composite-filled polyamide nanofiltration membrane

A technology of sodium carboxymethyl cellulose and composites, which is applied in the field of preparation of polyamide nanofiltration membranes filled with sodium carboxymethyl cellulose composites, and can solve the problems of high manufacturing costs, inconspicuous modification effects, and easy aggregation of nanomaterials and other issues, to achieve the effect of convenient and easy access to raw materials, good industrial applicability, and improved transmission efficiency

Active Publication Date: 2014-09-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, according to the existing reports, these modified materials still have problems such as ineffective modification, high manufacturing cost of nanomaterials, easy aggregation in the membrane, and defects in the membrane.

Method used

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  • Method for preparing carboxymethylcellulose sodium composite-filled polyamide nanofiltration membrane
  • Method for preparing carboxymethylcellulose sodium composite-filled polyamide nanofiltration membrane

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preparation example Construction

[0017] The preparation method of sodium carboxymethyl cellulose composite filled polyamide nanofiltration membrane comprises the steps:

[0018] (1) Dissolve 1-3 parts by mass of sodium carboxymethylcellulose and 0.5-2 parts by mass of cationic polyelectrolyte in 100-500 parts by mass of acidic aqueous solution, and then add the above-mentioned acidic aqueous solution of cationic polyelectrolyte to carry out ionic cross-linking in acidic aqueous solution of sodium carboxymethyl cellulose, precipitate with deionized water for many times, wash and dry to obtain sodium carboxymethyl cellulose complex; ~500 parts by mass of alkaline aqueous solution to form a composite dispersion;

[0019] (2) Dissolve the polyamine monomer in water, then add the compound dispersion and sodium hydroxide solid to make an aqueous phase solution; dissolve the polyacyl chloride monomer in an organic solvent to make an organic phase solution;

[0020] (3) Immerse the porous polysulfone support membran...

Embodiment 1

[0024]Get 1g sodium carboxymethyl cellulose and 0.5g polydimethyldiallyl ammonium chloride to be dissolved in 100g mass percentage concentration respectively in the hydrochloric acid aqueous solution of 0.01wt%, then above-mentioned polydimethyldiallyl chloride The ammonium chloride acidic aqueous solution was added dropwise to the sodium carboxymethylcellulose acidic aqueous solution to carry out ion cross-linking, after several times of deionized water precipitation, washing, and at 40 oC After drying for 16 hours at a lower temperature, the sodium carboxymethyl cellulose composite was obtained; then the above-mentioned 0.1g composite was added to 100g of a mass percentage concentration of 0.1wt% sodium hydroxide aqueous solution to form a composite dispersion; the porous poly The sulfone support membrane was immersed for 1 minute in the aqueous phase solution, the concentration of piperazine in the aqueous phase solution was 0.2 wt%, the concentration of the complex was 0.0...

Embodiment 2

[0027] Get 3 g sodium carboxymethyl cellulose and 2 g polydimethyldiallyl ammonium chloride to be dissolved in 500 g mass percent concentration respectively in the hydrochloric acid aqueous solution of 0.1 wt%, then above-mentioned polydimethyldiallyl Ammonium chloride acidic aqueous solution was added dropwise to carboxymethylcellulose sodium acidic aqueous solution to carry out ion cross-linking, after several times of deionized water precipitation, washing and drying at 60 oC After drying for 8 hours under high temperature, the sodium carboxymethylcellulose composite was obtained; then the above-mentioned 0.5 g of the composite was added to 500 g of a mass percentage concentration of 0.5 wt% sodium hydroxide aqueous solution to form a composite dispersion; the porous The polysulfone support membrane was immersed in the aqueous solution for 4 minutes. The concentration of piperazine in the aqueous solution was 3 wt%, the concentration of the complex was 0.5 wt%, and the conc...

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Abstract

The invention discloses a method for preparing a carboxymethylcellulose sodium composite-filled polyamide nanofiltration membrane. The method comprises the steps: preparing a carboxymethylcellulose sodium composite by an ionic crosslinking method, adding the carboxymethylcellulose sodium composite into an aqueous phase monomer solution for synthesis of a polyamide membrane, and preparing the carboxymethylcellulose sodium composite-filled polyamide nanofiltration membrane by an interfacial polymerization method. With utilization of good hydrophilicity, charge performance and a unique nano pore structure of the composite, the water permeation flux of the membrane is greatly improved while the high selectivity of the polyamide membrane on an inorganic salt is kept. Under an operating pressure of 0.6 MPa, the nanofiltration membrane has the water flux of 50-65 L.m<-2>.h<-1>, has quite high interception rate on divalent ions and the highest reaching 97%, and has the interception rate on monovalent ions of generally less than 25%. Therefore, the prepared carboxymethylcellulose sodium composite-filled polyamide nanofiltration membrane has high separation selectivity and water permeation flux, and has the advantages of simple and feasible membrane preparation method, low cost, and good industrialized application prospects.

Description

technical field [0001] The invention belongs to the field of nanofiltration membrane separation, and in particular relates to a preparation method of polyamide nanofiltration membrane filled with sodium carboxymethyl cellulose compound. Background technique [0002] As a new separation technology, nanofiltration has the advantages of low energy consumption, high separation efficiency, and environmental protection compared with traditional separation technologies such as distillation and rectification. Nanofiltration membrane is a new type of pressure-driven separation membrane with a pore size between ultrafiltration membrane and reverse osmosis membrane. According to the principles of electrostatic repulsion and pore size sieving, nanofiltration membranes can intercept high-valence ions and organic macromolecules, while allowing low-valence ions and small organic molecules to pass through. And the separation of organic substances with different molecular weights has been g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D67/00C08G69/26C08L1/26C08L39/00C08L33/14C08L39/08C08L1/02C08L77/06
Inventor 安全福计艳丽高从堦
Owner ZHEJIANG UNIV
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