Positively charged composite nano filtration membrane and preparation method

A composite nanofiltration membrane and positively charged technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of low water flux, complex preparation methods, and positively charged nanofiltration membrane And other issues

Active Publication Date: 2019-05-24
OCHEMATE MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Patent CN105013333A discloses a positive charge composite nanofiltration membrane and its preparation method. After compounding a layer of base film on polypropylene or polyacrylonitrile non-woven fabric, a layer of positive charge separation layer is compounded to prepare a composite nanofiltration membrane. Filter membrane, the nanofiltration membrane under the operating pressure of 0.8...

Method used

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  • Positively charged composite nano filtration membrane and preparation method
  • Positively charged composite nano filtration membrane and preparation method
  • Positively charged composite nano filtration membrane and preparation method

Examples

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preparation example Construction

[0082] (1) Preparation of modified meta-aramid polymer

[0083]Under nitrogen protection, add 80.383mL of DMAc solvent, 0.077mol of m-phenylenediamine, 0.0616mol of APBIA and 0.0154mol of 4-fluoro-1,3-phenylenediamine into a 1L four-necked flask equipped with mechanical stirring and a thermometer. Stir under nitrogen protection until the solute is completely dissolved. Use a freezing bath to adjust the reaction temperature to -15°C, add 0.1155mol of isophthaloyl chloride under stirring, control the reaction temperature of the reaction system below 0°C, and continue to add 0.0262mol of isophthaloyl dimethanol after reacting until the viscosity of the system is stable Acyl chloride, after the reaction until the viscosity of the system is stable, add 0.0123mol of isophthaloyl chloride at the end, the solution starts to thicken, the temperature rises, adjust the stirring speed to control the reaction temperature below 60°C until the reaction is complete, after adding 0.154mol of c...

Embodiment 1

[0110] (1) Preparation of aqueous solution: mix polyethyleneimine, piperazine, SDS and acid absorbent into deionized water to prepare an aqueous solution. In the aqueous solution, the molecular weight of polyethyleneimine is 3000, and the total content of polyethyleneimine and piperazine is 0.5% (w / v), and the ratio of piperazine in this total content is 5%, and the content of surfactant SDS is 0.3% (w / v), acid absorbent (NaCO 3 :NaOH=2:1) ​​content is 0.3% (w / v).

[0111] (2) Preparation of organic solution: adding trimesoyl chloride to isoparaffin Isopar G to prepare an organic solution. The content of trimesoyl chloride in the organic solution is 0.05% (w / v).

[0112] (3) Immerse the modified meta-aramid hollow fiber base membrane in the aqueous solution, take it out after 1 minute, and dry it for 7 minutes after taking it out.

[0113] (4) Immerse the dried basement film in step (3) into an organic solution for interfacial polymerization, take it out after 1 minute, and...

Embodiment 2

[0116] Except that the total content of polyethyleneimine and piperazine was changed to 1.5% (w / v), other experimental conditions were the same as in Example 1.

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Abstract

The invention discloses a positively charged composite nano filtration membrane. The nano filtration membrane is characterized in that a modified meta-aramid hollow fiber membrane is taken as a base membrane, an ultra-thin polyamide layer is formed by positively charged polyelectrolyte, polyamine and polyacyl chloride through interfacial polymerization, and a method for preparing the composite nano filtration membrane is prepared. According to the composite nano filtration membrane, pure water throughput under 0.3 MPa is greater than or equal to 24 L (m2 h), the desalting rate of 2g/L divalentcation salt solution is greater than or equal to 90%, the needed cost is lower, and industrialization is easy. The preparation method is simple, operation is easy, reaction conditions are mild, the performance is stable, and the market application prospects are wider.

Description

technical field [0001] The invention relates to the technical field of polymer nanofiltration membranes, in particular to a positively charged composite nanofiltration membrane and a preparation method thereof. Background technique [0002] Nanofiltration (NF) is a membrane separation technology between ultrafiltration (UF) and reverse osmosis (RO). Nanofiltration membranes have good separation performance for high-priced and divalent salts and small molecular organics, and also have the advantages of low operating pressure, large pure water flux, and lower cost. They are widely used in water softening, desalination, and wastewater treatment. application prospects. At present, the preparation methods of nanofiltration membrane mainly include phase inversion method, dip coating method, surface graft polymerization method and interfacial polymerization method. Among them, the interfacial polymerization method is to prepare a nanofiltration functional separation layer on the u...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D67/00B01D69/02B01D69/12B01D71/60
Inventor 王蒙雷冰王冰菲方佩晖
Owner OCHEMATE MATERIAL TECH CO LTD
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