Solvent-resistant composite nanofiltration membrane and preparing method

A composite nanofiltration membrane, solvent-resistant technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of separation performance decline, swelling, dissolution, etc., to achieve rapid reaction, simple process, high separation Effects of selectivity and solvent tolerance

Active Publication Date: 2017-01-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[Yao Guoying, Nanofiltration Membrane Materials and Their Applications. Journal of Shanghai Institute of Applied Technology: Natural Science Edition, 2004, 3(4): 255-259.] The nanofiltration membranes prepared by these materials can perform very well in aqueous solution systems. Excellent sep

Method used

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  • Solvent-resistant composite nanofiltration membrane and preparing method
  • Solvent-resistant composite nanofiltration membrane and preparing method

Examples

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Embodiment 1

[0027] A preparation method of a solvent-resistant composite nanofiltration membrane, comprising the steps of:

[0028] (1) Mix polyetherimide and N,N-dimethylacetamide so that the mass concentration of polyetherimide-N,N-dimethylacetamide solution is 15%, at 35°C, stir 3 hours, and then at a temperature of 15°C, let it stand for defoaming for 12 hours to make a casting solution, press 600cm 2 The ratio of 12g scrapes the cast film solution on the smooth surface of a smooth non-woven fabric, places it in the air for 5 seconds, then puts it into deionized water, soaks it for 10 minutes, takes it out and blots the surface moisture with filter paper, and obtains the base For the film, the side of the scraped casting film of the non-woven fabric is called the A side;

[0029] (2) Soak the A side of the base film in an ethylenediamine methanol solution with a mass concentration of 0.1%, soak for 1 hour, take it out, wash it 3 times with deionized water, and obtain a crosslinked fi...

Embodiment 2

[0035] A preparation method of a solvent-resistant composite nanofiltration membrane, comprising the steps of:

[0036] (1) Mix polyetherimide and N,N-dimethylformamide so that the mass concentration of polyetherimide-N,N-dimethylformamide solution is 40%, stir at 80°C The time is 8 hours, and then at a temperature of 20°C, stand for degassing for 5 hours to make a casting solution, press 600cm 2 The ratio of 15g scrapes the cast film solution on the smooth surface of the non-woven fabric with a smooth surface, places it in the air for 30 seconds, then puts it into deionized water, soaks it for 40 minutes, takes out the surface moisture with filter paper, and obtains the base For the film, the side of the scraped casting film of the non-woven fabric is called the A side;

[0037] (2) Soak the A side of the base film in an ethylenediamine methanol solution with a mass concentration of 20%, soak for 1 hour, take it out, wash it 3 times with deionized water, and obtain a cross-l...

Embodiment 3

[0042] A preparation method of a solvent-resistant composite nanofiltration membrane, comprising the steps of:

[0043] (1) Mix polyetherimide and N,N-dimethylformamide so that the mass concentration of polyetherimide-N,N-dimethylformamide solution is 30%, at 35°C, stir The time is 4 hours, and then at a temperature of 6°C, stand for degassing for 24 hours to make a casting solution, press 600cm 2The ratio of 20g scrapes the cast film solution on the smooth surface of a smooth non-woven fabric, places it in the air for 60 seconds, then puts it into deionized water, soaks it for 5 minutes, takes out the surface moisture with filter paper, and obtains the base For the film, the side of the scraped casting film of the non-woven fabric is called the A side;

[0044] (2) Soak the A side of the base film in an ethylenediamine methanol solution with a mass concentration of 10%, soak for 0.5 hours, take it out, wash it twice with deionized water, and obtain a crosslinked film;

[00...

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Abstract

The invention discloses a solvent-resistant composite nanofiltration membrane and a preparing method. The preparing method comprises the steps that firstly, polyetherimide and an organic solvent are mixed and stirred at 35-80 DEG C, then standing is carried out at 6-25 DEG C for defoaming, a membrane casting solution is obtained and spread on non-woven fabric, the non-woven fabric is put in air, soaked with deionized water and taken out, moisture on the surface is absorbed with filter paper, and a base membrane is obtained, wherein the face, with the membrane casting solution spread, of the non-woven fabric is called a face A; secondly, the face A of the base membrane is soaked in an ethylenediamine methanol solution, taken out and washed with deionized water, and a cross-linked membrane is obtained; thirdly, the face A of the cross-linked membrane is soaked in an ammonium lignosulfonate aqueous solution and taken out, then the face A is soaked in a trimesoyl chloride n-hexane solution, taken out and air-dried, and the solvent-resistant composite nanofiltration membrane is obtained. The solvent-resistant composite nanofiltration membrane and the preparing method are low in cost, the method is simple, and a reaction is quick; the obtained solvent-resistant composite nanofiltration membrane has high separation selectivity and solvent tolerance.

Description

technical field [0001] The invention relates to a solvent-resistant composite nanofiltration membrane and a preparation method thereof. Background technique [0002] Nanofiltration is a new type of membrane separation technology that has emerged in the past ten years. Nanofiltration is a pressure-driven membrane process, and its performance is between reverse osmosis and ultrafiltration membranes. The molecular weight cut-off is generally in the range of 200 to 1000. It has a high removal rate for divalent and high-valent salts, and is especially suitable for separating organic matter with a molecular weight of several hundred and divalent and high-valent inorganic salts. [0003] Nanofiltration membranes can be divided into asymmetric membranes and homogeneous membranes in form. The asymmetric membrane consists of an ultra-thin dense skin and a porous supporting bottom layer. Interfacial polymerization is currently the most widely used and most effective method for prepa...

Claims

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Application Information

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IPC IPC(8): B01D71/64B01D71/74B01D69/12B01D69/02B01D67/00
Inventor 李韡周阿洋张金利
Owner TIANJIN UNIV
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