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Preparation method of 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, which can solve the problems of high manufacturing costs of nanomaterials, ineffective modification effects, and membrane defects. and other issues, to achieve the effect of convenient and easy access to raw materials, good industrial applicability, and excellent membrane performance

Active Publication Date: 2015-12-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Preparation method of carboxymethylcellulose sodium composite filled polyamide nanofiltration membrane
  • Preparation method of carboxymethylcellulose sodium composite filled polyamide nanofiltration membrane

Examples

Experimental program
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Effect test

preparation example Construction

[0017] (1) 1 to 3 mass sodium carboxymethyl cellulose sodium and 0.5 to 2 cationic polycatolences are dissolved in an acidic aqueous solution of 100 to 500 mass, respectively, and then dripping the above -mentioned yang ionsIonic cross -linked in the sodium carboxymethyl cellulose sodium cellulose, removal of ionic water sedimentation after many times, washing and drying obtained sodium carboxymethyl cellulose sodium composite;~ 500 alkaline water solution with mass parts into a complex dispersal liquid;

[0018] (2) Discipline the polyamine monomer in the water, and then add the complex dispersing solution and sodium hydroxide solid to the water phase solution; dissolve the multi -alcohol -chlorine monomer in an organic solvent, and match the organic phase solution;

[0019] (3) Make a porous aggregate supporting film in a water phase solution for 1 to 4 minutes, remove and remove excessive surface water phase solutions; then immerse in the organic phase solution for 0.5 to 2 min...

Embodiment 1

[0024] Sodium carboxymethyl cellulose sodium complexes fill the polyamide nanoferous membrane at 25 o C, 0.6MPa pressure, for 1G.L -1 NaCl and NA 2 So 4 The separation result of the solution is: the interception rate of NACL is 21.2%, and the water flux is 50.6l.m -2 .h -1 ; 2 So 4 The interception rate is 94.7%, and the water flux is 49.5L.M -2 .h -1 Essence

[0025] Example 2:

Embodiment 2

[0027] Sodium carboxymethyl cellulose sodium complexes fill the polyamide nanoferous membrane at 25 o C, 0.6MPa pressure, for 1G.L -1 NaCl and NA 2 So 4 The separation result of the solution is: the interception rate of NACL is 23.5%, and the water flux is 53.8l.m -2 .h -1 ; 2 So 4 The interception rate is 95.2%, and the water flux is 52.5L.M -2 .h -1 Essence

[0028] Example 3:

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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 present invention is the field of nanofractive membrane separation, and especially involves a method of filling polyamide filter membrane to fill the polyamide filter membrane. Background technique [0002] As a new type of separation technology, Na Film has the advantages of low energy consumption, high separation efficiency, and environmental protection compared with traditional separation technologies such as distillation and distillation.The nanofilled membrane is a new type of pressure -driven separation membrane between the pores between the ultrafiltration membrane and the reverse osmosis membrane.According to the principle of electro -electrostatic exclusion and pore screening, the nanofilled membrane can cut high -priced ions and organic macromolecules, which makes low -cost ions and organic small molecules pass through, especially suitable for inorganic salts, inorganic salts and organic matter in different prices.The separation of different m...

Claims

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Application Information

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Patent Type & Authority Patents(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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