Polypiperazine-amide nanofiltration membrane and preparation method thereof

A technology of polypiperazine amide and nanofiltration membrane, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effect of broadening the selection range

Inactive Publication Date: 2009-01-28
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although nanofiltration membrane technology has made great progress, the existing membrane materials cannot meet people's needs. Under the condition of not losing the reje

Method used

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  • Polypiperazine-amide nanofiltration membrane and preparation method thereof
  • Polypiperazine-amide nanofiltration membrane and preparation method thereof
  • Polypiperazine-amide nanofiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 is that the piperazine aqueous solution that mass volume concentration is 1% is covered on the polysulfone supporting layer surface of wet state 3 minutes, pours off excess solution then, dries in the air for 6 minutes, then compares with mass volume concentration (g / ml) 0.2% isopar solution of 3,3′,5,5′-bipyrellithyl chloride (isopar purchased from Idemitsu Chemical Co. Ltd., Japan) was contacted on one side for interfacial polymerization reaction for 90 seconds. It was then subjected to the first heat treatment: 5 minutes at 80°C. Then carry out two-step rinsing: the first step is to rinse in 40° C. ethanol weight ratio of 10% aqueous solution for 20 minutes, and the second step is to rinse in 40° C. water for 20 minutes. Finally, the second heat treatment step is performed: treating at 100° C. for 5 minutes to obtain a polypiperazine amide nanofiltration membrane.

[0025] The test results are:

[0026]

[0027] Examples 2-6. The mass volume concen...

Embodiment 26-29

[0040] Examples 26-29. 3,3',5,5'-biphenyltetrayl chloride was used, and its mass volume concentration was 0.05, 0.1, 0.3, 0.5% respectively, and the rest of the conditions were the same as in Example 1. The test results are:

[0041]

[0042] Examples 30-34. 2,2',4,4'-biphenyltetrayl chloride was used, and its mass volume concentration was 0.05, 0.1, 0.2, 0.3, 0.5% respectively, and the rest of the conditions were the same as in Example 1. The test results are:

[0043]

Embodiment 35-39

[0044] Examples 35-39. 2,2',5,5'-biphenyltetraoyl chloride was used, and its mass volume concentration was 0.05, 0.1, 0.2, 0.3, 0.5% respectively, and the rest of the conditions were the same as in Example 1. The test results are:

[0045]

[0046] Examples 40-44. Adopt the mixture of 3,3',5,5'-biphenyltetrayl chloride and trimesoyl chloride, the total mass volume concentration is 0.2%, and its weight ratio 3,3',5,5'-biphenyltetrayl chloride: Trimellitic trichloride was 10:1, 5:1, 1:1, 1:10, 1:50 respectively, and the remaining conditions were the same as in Example 1. The test results are:

[0047]

[0048]

[0049] Examples 45-49. Adopt the mixture of 2,2',4,4'-bipyrellitic acid chloride and trimesoyl chloride, the total mass volume concentration is 0.2%, its weight ratio 2,2',4,4'-bipyrellitic acid chloride: Trimellitic trichloride was 10:1, 5:1, 1:1, 1:10, 1:50 respectively, and the remaining conditions were the same as in Example 1. The test results are:

...

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Abstract

The invention relates to a novel poly piperazine amide nanofiltration membrane and a preparation method thereof. The poly piperazine amide nanofiltration membrane provided by the invention consists of a polysulfone supporting layer and a poly piperazine amide functional layer which is prepared by interfacial polycondensation of the aromatic multi acyl chloride with biphenyl structure or compounds thereof and piperazine. The novel poly piperazine amide nanofiltration membrane is prepared by utilizing the interfacial polycondensation of the organic solution of the novel butyryl chloride with biphenyl structure or compounds thereof and the aqueous solution of piperazine on the polysulfone porous supporting layer. The nanofiltration membrane prepared by the method has high water flux (more than 60l/m<2>.h) and high desalinization ratio (above 98%) of dianion and comparatively high desalinization ratio of single valence anion (60%-70%) under the operation pressure of 0.5Mpa.

Description

technical field [0001] The invention relates to a polypiperazine amide nanofiltration membrane and a preparation method thereof Background technique [0002] Nanofiltration membrane is a new membrane separation technology between ultrafiltration and reverse osmosis. The operating pressure range is 0.2-1.0MPa, and the molecular weight cut-off of the membrane is in the range of 200-1000. Compared with ultrafiltration membrane and reverse osmosis membrane, nanofiltration membrane has high water flux and high rejection rate at lower operating pressure, especially for divalent ions and low molecular weight organic small molecules. rate (greater than 98%). Therefore, nanofiltration membranes are widely used in the desalination of brackish water, medicine, food and biology and other industries. [0003] The preparation techniques of nanofiltration membranes generally include the following types: phase inversion method, dilute solution coating method, interfacial polymerization m...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/10
Inventor 张所波李磊
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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