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Diphenol compound organic solvent nanofiltration composite membrane and preparation method thereof

An organic solvent and biphenol-based technology, which is applied in the field of biphenol-based compound organic solvent nanofiltration composite membrane and its preparation, can solve the problems of low performance of organic solvent nanofiltration membrane, stagnant development and application, etc., and maintain the selectivity of organic molecules , Short film-making time, precise separation effect

Active Publication Date: 2022-04-05
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, due to the low performance of commercially available organic solvent nanofiltration membranes, the development and application have tended to stagnate, and there is an urgent need to find more cost-effective organic solvent nanofiltration membrane materials

Method used

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  • Diphenol compound organic solvent nanofiltration composite membrane and preparation method thereof
  • Diphenol compound organic solvent nanofiltration composite membrane and preparation method thereof
  • Diphenol compound organic solvent nanofiltration composite membrane and preparation method thereof

Examples

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Effect test

Embodiment 1

[0033] A preparation method of a biphenol-based organic solvent composite nanofiltration membrane, the steps are as follows:

[0034] (1) Soak the polyacrylonitrile ultrafiltration membrane in pure water for 2 hours to remove the pore-preserving agent on the surface of the membrane;

[0035] (2) Take out the above-mentioned polyacrylonitrile ultrafiltration membrane, soak it in 5,5'-diamino-2,2'-biphenol concentration of 1.0wt% and triethylamine concentration of 2.0wt% at 25°C the aqueous solution for 2 minutes, take out the ultrafiltration membrane and use a rubber roller to remove the remaining water droplets on the surface of the membrane, and set aside;

[0036] (3) Soak the polyacrylonitrile ultrafiltration membrane treated in step (2) in an isoparaffin solution with a trimesoyl chloride concentration of 0.1 wt% and react for 1 min at 25°C;

[0037] (4) The filter membrane reacted in step (3) was placed in an oven at 65° C., and heated for 5 min to obtain a biphenol-base...

Embodiment 2

[0043] A preparation method of a biphenol-based organic solvent composite nanofiltration membrane, the steps are as follows:

[0044] (1) Soak the polyacrylonitrile ultrafiltration membrane in pure water for 2 hours to remove the pore-preserving agent in the membrane;

[0045](2) Take out the above-mentioned polyacrylonitrile ultrafiltration membrane, soak it in 5,5'-diamino-2,2'-biphenol concentration of 1.0wt% and triethylamine concentration of 2.0wt% at 25°C The aqueous solution of 2min, take out the film, and use the rubber roller to remove the residual water droplets on the surface of the film, set aside;

[0046] (3) Soak the polyacrylonitrile ultrafiltration membrane treated in step (2) in an isoparaffin solution with a concentration of isophthaloyl chloride of 0.1 wt% and react for 2 minutes at 25°C;

[0047] (4) The nanofiltration membrane after the reaction in step (3) was placed in an oven at 65° C. and heated for 5 minutes to obtain a biphenol-based organic solven...

Embodiment 3

[0050] A preparation method of a biphenol-based organic solvent composite nanofiltration membrane, the steps are as follows:

[0051] (1) Soak the polyacrylonitrile ultrafiltration membrane in pure water for 2 hours to remove the pore-preserving agent in the membrane;

[0052] (2) Take out the above-mentioned polyacrylonitrile ultrafiltration membrane, soak it in 5,5'-diamino-2,2'-biphenol concentration of 1.0wt% and triethylamine concentration of 2.0wt% at 25°C In the aqueous solution, take out the membrane after 2min, and use a rubber roller to remove the residual water droplets on the surface of the membrane, and set aside;

[0053] (3) Soak the polyacrylonitrile ultrafiltration membrane treated in step (2) in an isoparaffin solution with a terephthaloyl chloride concentration of 0.1 wt% and react for 5 minutes at 25°C;

[0054] (4) The nanofiltration membrane after the reaction in step (3) was placed in an oven at 65° C. and heated for 5 minutes to obtain a biphenol-based...

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Abstract

The invention discloses a biphenol-based organic solvent composite nanofiltration membrane and a preparation method thereof, and belongs to the technical field of separation membranes. The preparation method comprises the following steps: by taking a polyacrylonitrile or polyimide ultrafiltration membrane as a base membrane, removing a surface pore-retaining agent, firstly soaking in an aqueous solution containing a 2, 2 '-diphenol compound, then soaking in an organic solution containing multi-acyl chloride to carry out interfacial polymerization reaction, and finally, carrying out thermal crosslinking drying to obtain the composite nanofiltration membrane. The composite nanofiltration membrane disclosed by the invention has relatively high stability in various polar organic solvents, has high selectivity and permeability to organic molecules, and has relatively high economic value in separation of an organic solvent system in industry.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a biphenol-based compound organic solvent nanofiltration composite membrane and a preparation method thereof. Background technique [0002] Nanofiltration membrane is a kind of artificial semipermeable membrane that can realize separation operation. It has a relatively loose active layer structure, and its working principle is driven by pressure difference. It has the advantages of low energy consumption, high ion selectivity, and high permeation flux. At present, nanofiltration membranes have been widely used in the preparation of drinking water, sewage treatment, food industry and other fields. Organic solvent nanofiltration technology, as an emerging membrane separation technology, requires nanofiltration membranes to have excellent solvent tolerance, high solvent permeability and strict selectivity within the target size range. At present, the organic solvent na...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D69/10B01D69/02B01D61/00B01D71/64B01D71/42B01D71/82
Inventor 李少路常国梁黄阳正龚耿浩胡云霞
Owner TIANJIN POLYTECHNIC UNIV
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