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High-selectivity polyamide nanofiltration membrane and preparation method thereof

A high-selectivity, polyamide technology, applied in the field of membrane separation, can solve the problems of low selectivity and insufficient water flux, and achieve the effect of simple preparation process and broad application prospects.

Active Publication Date: 2020-12-18
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current commercial polyamide nanofiltration membranes still have the problems of low selectivity of monovalent and divalent salts and insufficient water flux.

Method used

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  • High-selectivity polyamide nanofiltration membrane and preparation method thereof
  • High-selectivity polyamide nanofiltration membrane and preparation method thereof
  • High-selectivity polyamide nanofiltration membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A 1,4-diazepane aqueous phase solution with a concentration of 0.3% (w / v) and a trimesoyl chloride n-hexane solution with a concentration of 0.3% (w / v) were prepared. Introduce the water phase solution into the inner cavity of the hollow fiber membrane. The coating time of the water phase solution is 5 minutes. Slowly put the hollow membrane module into the organic phase solution to react for 2 minutes. The temperature of the organic phase is 25°C. .

Embodiment 2

[0038] A 1,4-diazepane aqueous phase solution with a concentration of 0.3% (w / v) and a trimesoyl chloride n-hexane solution with a concentration of 0.3% (w / v) were prepared. Introduce the water phase solution into the inner cavity of the hollow fiber membrane. The coating time of the water phase solution is 5 minutes. Slowly put the hollow membrane module into the organic phase solution to react for 2 minutes. The temperature of the organic phase is 25°C. .

Embodiment 3

[0040] A 1,4-diazepane aqueous phase solution with a concentration of 0.1% (w / v) and a trimesoyl chloride n-hexane solution with a concentration of 0.3% (w / v) were prepared. Introduce the water phase solution into the inner cavity of the hollow fiber membrane. The coating time of the water phase solution is 5 minutes. Slowly put the hollow membrane module into the organic phase solution to react for 2 minutes. The temperature of the organic phase is 25°C. .

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Abstract

The invention provides a high-selectivity polyamide nanofiltration membrane and a preparation method thereof. The high-selectivity polyamide nanofiltration membrane is composed of a porous support base membrane and a polyamide separation layer, wherein the polyamide separation layer is prepared by carrying out interfacial polymerization on a polybasic acyl chloride organic solution and an aqueoussolution of 1, 4-diazacycloheptane or a mixture thereof on the surface of a porous support base membrane; the high-selectivity polyamide nanofiltration membrane has excellent monovalent and divalent salt selectivity and water flux, and is expected to have a wide application prospect in the fields of wastewater salt separation recycling, sea water desalination and drinking water purification.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a high-selectivity polyamide nanofiltration membrane and a preparation method thereof. Background technique [0002] The membrane separation process is to use the difference in the selective permeability of the separation membrane to each component, and then realize the separation and purification of the solute and solvent in the component. Nanofiltration membrane is a functional semi-permeable membrane that allows solvent molecules or some low-molecular-weight solutes or low-priced ions to pass through. At present, in practical applications, nanofiltration membrane separation technology is facing many challenges, among which the development of nanofiltration membranes with high water flux and high selectivity is a hot and difficult point in the field of separation membranes and water treatment. [0003] The interfacial polymerization method is currently ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/04B01D69/06B01D69/08B01D69/12B01D71/16B01D71/30B01D71/34B01D71/36B01D71/38B01D71/42B01D71/56B01D71/64B01D71/68C02F1/44
CPCB01D61/027B01D67/0002B01D69/12B01D71/56B01D71/68B01D71/64B01D71/42B01D71/30B01D71/34B01D71/36B01D71/16B01D71/38B01D69/04B01D69/06B01D69/08C02F1/442Y02A20/131
Inventor 武春瑞郭乐乐刘四华史乐吕晓龙
Owner TIANJIN POLYTECHNIC UNIV
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