High-selectivity self-microporous polyamide nanofiltration composite membrane and preparation method thereof

A high-selectivity, polyamide nanotechnology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as poor pollution resistance, insufficient selectivity, and large membrane surface roughness.

Active Publication Date: 2021-09-14
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to prepare a highly selective self- Microporous nanofiltration membranes to solve the problems of low flux, insufficien

Method used

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  • High-selectivity self-microporous polyamide nanofiltration composite membrane and preparation method thereof
  • High-selectivity self-microporous polyamide nanofiltration composite membrane and preparation method thereof
  • High-selectivity self-microporous polyamide nanofiltration composite membrane and preparation method thereof

Examples

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Example Embodiment

[0042] Example 1

[0043] The present embodiment 1 provides a preparation method of a highly selective self-microporous polyamide nanofiltration composite membrane, comprising the following steps:

[0044] (1) Dissolving PIP (piperazine) in water to obtain a PIP solution with a mass concentration of 1%, 2,8-diamino-4,10-dimethyl-6H,12H-5,11-methylenediphenyl and [1,5]-diazacyclopropane sulfonate was added to the PIP solution at a mass concentration of 1%, and stirred to fully dissolve to obtain an aqueous mixed amine solution;

[0045] (2) Immerse the polysulfone base membrane in the aqueous mixed amine solution, take it out after immersion for 3 minutes, and dry the residual aqueous mixed amine solution on the surface of the polysulfone base membrane with an air knife;

[0046] (3) using trimesic acid chloride and organic solvent n-hexane to prepare an organic phase trimesic acid chloride solution with a mass concentration of 0.1%, immersing the upper surface of the film obt...

Example Embodiment

[0052] Example 2

[0053] The present embodiment 2 provides a preparation method of a highly selective self-microporous polyamide nanofiltration composite membrane, comprising the following steps:

[0054] (1) Dissolve ethylenediamine in water to obtain an ethylenediamine solution with a mass concentration of 2%, dissolve 3,9-diamino-4,10-dimethyl-6H,12H-5,11-methylenediamine Benzo[1,5]-diazacyclopropane sulfonate is added to the ethylenediamine solution according to the mass concentration of 2%, and stirred to be fully dissolved to obtain an aqueous mixed amine solution;

[0055] (2) Immerse the polysulfone-based membrane in the aqueous mixed amine solution, take it out after dipping for 2 minutes, and dry the residual aqueous solution on the surface of the polysulfone-based membrane with a rubber roller;

[0056] (3) adopting pyromellitic acid chloride and organic solvent n-heptane to prepare an organic phase pyromellitic acid chloride solution with a mass concentration of ...

Example Embodiment

[0059] Example 3

[0060] The present embodiment 3 provides a preparation method of a highly selective self-microporous polyamide nanofiltration composite membrane, comprising the following steps:

[0061] (1) Dissolving piperazine in water to obtain a piperazine solution with a mass concentration of 1%, 3,9-diamino-4,10-dimethyl-6H,12H-5,11-methylenedibenzo[ 1,5]-diazacyclopropane sulfonate was added to the PIP solution according to a mass concentration of 1%, and stirred to fully dissolve to obtain an aqueous mixed amine solution;

[0062] (2) Immerse the polysulfone-based membrane in an aqueous mixed amine solution, take it out after dipping for 2 minutes, and dry the residual aqueous solution on the surface of the polysulfone-based membrane with an air knife;

[0063] (3) using trimesic acid chloride and organic solvent n-hexane to prepare an organic phase trimesic acid chloride solution with a mass concentration of 0.1%, immersing the upper surface of the film obtained i...

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Abstract

The invention discloses a high-selectivity self-microporous polyamide nanofiltration composite membrane and a preparation method thereof. The composite membrane is formed by compounding an ultrafiltration base membrane and a polyamide separation layer, wherein the polyamide separation layer is formed by polymerizing a water-phase mixed amine solution and an organic acyl chloride solution on the surface of the ultrafiltration base membrane, the water-phase mixed amine solution is a mixed solution of organic amine and an amine monomer which contains a sulfonic acid quaternary ammonium salt group and has a rigid twisted structure; the ultrafiltration base membrane can also adopt a surface hydrophilic modified ultrafiltration base membrane, and the polyamide separation layer is polymerized on the surface of the hydrophilic modified ultrafiltration base membrane in an in-situ support-free interface polymerization mode, so that the ultrathin high-selectivity self-microporous polyamide nanofiltration composite membrane can be obtained. The high-selectivity self-microporous nanofiltration membrane is prepared by introducing a novel amine monomer which contains a sulfonic acid quaternary ammonium salt group and has a rigid twisted structure, and the problems that an existing self-microporous nanofiltration membrane is relatively hydrophobic, so that the flux is low, the selectivity is insufficient, the pollution resistance is poor due to large membrane surface roughness and the like can be solved.

Description

technical field [0001] The invention relates to the technical field of nanofiltration membrane preparation, in particular to a highly selective self-microporous polyamide nanofiltration composite membrane and a preparation method thereof. Background technique [0002] The shortage of clean water has always been a daunting and long-term challenge faced by mankind worldwide, which is further exacerbated by water pollution caused by industrial wastewater discharge. Due to the advantages of process controllability, low cost, high efficiency and environmental protection, membrane separation technology has become an effective way to alleviate the shortage of clean water, realize energy saving, emission reduction and environmental protection. Separation membranes mainly include microfiltration membranes, ultrafiltration membranes, nanofiltration membranes, reverse osmosis membranes and dialysis membranes. Among them, the nanofiltration membrane can realize the selective separation...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00
CPCB01D69/12B01D69/125B01D67/0006Y02A20/131
Inventor 侯影飞蒋驰姜琳
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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