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Preparation method of positively charged composite nanofiltration membrane

A composite nanofiltration membrane, positively charged technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of high retention rate of divalent salts and low efficiency of divalent salts

Inactive Publication Date: 2013-04-03
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] When desalting crude dye solutions rich in sodium sulfate and sodium chloride, Na 2 SO 4 Etc. The low problem of divalent salt efficiency, the purpose of the invention is to provide a kind of preparation method of efficient dye desalination composite nanofiltration membrane, solve existing composite nanofiltration membrane to Na 2 SO 4 The problem of high rejection rate of divalent salt

Method used

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  • Preparation method of positively charged composite nanofiltration membrane
  • Preparation method of positively charged composite nanofiltration membrane
  • Preparation method of positively charged composite nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 1: Preparation of aqueous monomer solution

[0039] (1) Add polyethyleneimine, sodium carbonate and sodium dodecylsulfonate to deionized water, heat and stir until sodium dodecylsulfonate dissolves;

[0040] (2) Add 2-hydroxypropyltrimethylammonium chloride chitosan to the solution described in (1), heat and stir until 2-hydroxypropyltrimethylammonium chloride dissolves;

[0041] (3) Add nano-titanium dioxide powder into the solution described in (2), stir to disperse nano-titanium dioxide into a suspension, and ultrasonically oscillate the suspension to obtain a uniform and stable dispersion of nano-titanium dioxide, which is the aqueous phase for interfacial polymerization monomer solution.

[0042] The mass percentage composition of polyethyleneimine in the above-mentioned aqueous phase monomer solution is 3%, the mass percentage composition of sodium carbonate is 0.2%, the mass percentage composition of sodium lauryl sulfonate is 0.2%, chitosan The mass perce...

Embodiment 2

[0056] Step 1: Preparation of aqueous monomer solution

[0057] (1) Add polyethyleneimine, sodium carbonate, and sodium dodecylsulfonate to ionized water, heat and stir until sodium dodecylsulfonate dissolves;

[0058] (2) Add N, N, N-trimethyl chitosan quaternary ammonium salt to the solution described in (1), heat and stir until N, N, N-trimethyl chitosan quaternary ammonium salt dissolves;

[0059] (3) Add nano-titanium dioxide powder into the solution described in (2), stir to disperse nano-titanium dioxide into a suspension, and ultrasonically oscillate the suspension to obtain a uniform and stable dispersion of nano-titanium dioxide, which is the aqueous phase for interfacial polymerization monomer solution.

[0060] The mass percentage composition of polyethyleneimine in the above-mentioned aqueous phase monomer solution is 4%, the mass percentage composition of sodium carbonate is 0.3%, the mass percentage composition of sodium lauryl sulfonate is 0.3%, chitosan The ...

Embodiment 3

[0074] Step 1: Preparation of aqueous monomer solution

[0075] (1) Add polyethyleneimine, sodium carbonate and sodium dodecylsulfonate in deionized water, heat and stir until sodium dodecylsulfonate dissolves;

[0076] (2) Add O-carboxymethyl-N-trimethyl chitosan quaternary ammonium salt to the solution described in (1), heat and stir O-carboxymethyl-N-trimethyl chitosan quaternary ammonium salt to dissolve ;

[0077] (3) Add nano-titanium dioxide powder into the solution described in (2), stir to disperse the nano-titanium dioxide into a suspension, and ultrasonically oscillate the suspension to obtain a uniform and stable dispersion of nano-titanium dioxide, which is the aqueous phase for interfacial polymerization monomer solution.

[0078] The mass percentage composition of polyethyleneimine in the above-mentioned aqueous phase monomer solution is 5%, the mass percentage composition of sodium carbonate is 0.4%, the mass percentage composition of sodium lauryl sulfonate ...

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Abstract

The invention discloses a preparation method of a positively charged composite nanofiltration membrane, belonging to the technical field of the membrane. The key technology comprises the processes of utilizing polyethyleneimine (PEI), chitosan quaternary ammonium salt, and nano TiO2 as water-phase film-forming materials; taking trimesoyl chloride (TMC) as an organic-phase film-forming material; taking ultrafiltration membranes such as polysulfone, polyether sulfone and sulfonated polyethersulfone as supported base membranes, and preparing the PEI / chitosan quaternary ammonium salt / TiO2 / TMC composite nano-filtration membranes by an interfacial polymerization method. The membrane has the advantages of high flux, high dye intercept rate, and low intercept rate of inorganic salt such as sodium sulfate and sodium chloride, can generate negative intercept phenomenon of salt when dye / salt system is separated, is high in dye and inorganic salt separating efficiency, and is suitable for desalination and purification of coarse liquid dye, especially the preparation of high-purity liquid dye for digital ink-jet printing.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a preparation method of a positively charged composite nanofiltration membrane for dye desalination. Background technique [0002] In the digital printing industry, dye-based ink has become the main source of ink for commercial inkjet printers due to its advantages such as convenient preparation, low cost, environmental protection, good product stability, bright colors, and complete color spectrum. The traditional dye production uses the salting-out process to separate the dye, resulting in a large amount of salt in the finished dye. Such dye cannot be used to directly prepare printing ink, otherwise it will easily lead to corrosion and blockage of the printer nozzle. [0003] Nanofiltration technology was born in the 1980s. The surface active layer of the nanofiltration membrane has a nano-scale microporous structure, so it is named nanofiltration membrane. The na...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/10B01D69/12B01D67/00
Inventor 张浩勤白雪王景涛张亚涛刘金盾
Owner ZHENGZHOU UNIV
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