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A kind of composite nanofiltration membrane and preparation method thereof

A technology of composite nanofiltration membrane and base membrane

Active Publication Date: 2021-11-16
OCHEMATE MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above aromatic polyamide hollow fiber membranes do not mention the removal effect of salt solution, and the existing composite nanofiltration membranes still have some shortcomings or deficiencies, such as higher cost or lower pure water flux, Or the salt rejection rate is low, or the preparation process is more complicated, etc.

Method used

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  • A kind of composite nanofiltration membrane and preparation method thereof
  • A kind of composite nanofiltration membrane and preparation method thereof
  • A kind of composite nanofiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0076] (1) Preparation of modified meta-aramid polymer

[0077] 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 ...

Embodiment 1

[0104] (1) Prepare an aqueous solution: mix piperazine monomer (PIP), 2,5-diaminotrifluorobenzene monomer, SDS and triethylamine into deionized water to prepare an aqueous solution. In this aqueous solution, the content of piperazine monomer is 0.5% (w / v), the content of 2,5-diaminotrifluorobenzene monomer is 0.025% (w / v), and the content of SDS is 0.06% (w / v). v), the content of triethylamine is 0.2% (w / v).

[0105] (2) Preparation of organic solution: adding trimesoyl chloride into n-hexane to prepare an organic solution. The content of trimesoyl chloride in the organic solution was 0.3% (w / v).

[0106] (3) Immerse the modified meta-aramid hollow fiber base membrane in the aqueous solution, take it out after 1 minute, and dry it for 15 minutes after taking it out.

[0107] (4) Immerse the dried basement film in step (3) into an organic solution for interfacial polymerization, take it out after 1 minute, and dry it for 5 minutes after taking it out.

[0108] (5) heat-treat...

Embodiment 2

[0110] Except that the content of piperazine monomer in the aqueous solution was changed to 1% (w / v), other experimental conditions were the same as in Example 1.

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Abstract

The invention discloses a composite nanofiltration membrane. The composite nanofiltration membrane uses a modified meta-aramid hollow fiber membrane as a base membrane, and adopts polyamines, diaminobenzene fluorides and polyacyl chlorides to pass through the interface on the base membrane. The polymerization reaction forms an ultrathin polyamide layer and provides a method for preparing this composite nanofiltration membrane. Adopt the technical scheme of the present invention, the pure water flux of the prepared composite nanofiltration membrane under 0.5MPa ≥ 50L / (m 2 h), the desalination rate to 2g / L divalent cation salt solution is more than or equal to 80%, and the required cost is low, and it is easy to industrialize; in addition, the preparation method adopted is simple, the reaction conditions are mild, the performance is stable, and it has a large market application prospects.

Description

technical field [0001] The invention relates to the technical field of polymer nanofiltration membranes, in particular to a 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 membrane preparation methods mainly include phase inversion method, dip coating method, surface graft polymerization method and interfacial polymerization method. Among them, the interfacial polymerization method is a preparation technology for preparing a nanofiltration functional separation layer on the ultrafiltration base membrane by interfacial polymerization. . Due to the simple operation and obvious advantages of this method, this preparation technology has been widely used in the preparation of commercial nanofiltration membranes. [0003] For example, Chinese patent CN105617875A discloses a high-throughput hollow fiber com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/56B01D69/12B01D69/08B01D69/02B01D67/00
CPCB01D67/0011B01D67/0013B01D69/02B01D69/08B01D69/12B01D71/56
Inventor 方佩晖王冰菲曹俊
Owner OCHEMATE MATERIAL TECH CO LTD
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