Composite lignin nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane, lignin technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effects of high flux, rapid reaction, and high separation selectivity

Active Publication Date: 2015-07-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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, etc., and this separation field is generally unreachable by ultrafiltration membranes.

Method used

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  • Composite lignin nanofiltration membrane and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of a lignin composite nanofiltration membrane, comprising the steps of:

[0023] (1) Mix lignin, polyetherimide and N,N-dimethylformamide so that the mass concentration of lignin in the mixture is 2%, and the mass concentration of polyetherimide is 15%. ℃, stirred for 3 hours, and then at a temperature of 15 ℃, stood for defoaming for 12 hours to make a casting solution, according to 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;

[0024] (2) Soak side A of the base film in methanol solution of ethylenediamine with a mass concentration of 0.1%, soak for 1 hour, take it out, wash it with deionized water for 3 times, a...

Embodiment 2

[0028] A preparation method of a lignin composite nanofiltration membrane, comprising the steps of:

[0029] (1) Mix lignin, polyetherimide and N,N-dimethylacetamide so that the mass concentration of lignin in the mixture is 0.5%, and the mass concentration of polyetherimide is 25%. ℃, stirring time for 1 hour, and then at a temperature of 20 ℃, stand for defoaming 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;

[0030] (2) Soak the A side of the base film in a methanol solution of ethylenediamine with a mass concentration of 5% for 1 hour, take it out, wash it with deionized water for 3 times,...

Embodiment 3

[0034] A preparation method of a lignin composite nanofiltration membrane, comprising the steps of:

[0035] (1) Mix lignin, polyetherimide and N,N-dimethylformamide so that the mass concentration of lignin in the mixture is 0.5%, and the mass concentration of polyetherimide is 1%. ℃, stirring time for 2 hours, and then at 6℃, stand for defoaming for 24 hours to make a casting solution, press 600cm 2 The 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;

[0036] (2) Soak surface A of the base film in a methanol solution of ethylenediamine with a mass concentration of 10%, soak for 0.5 hours, take it out, and wash it twice with deionized water to obtain a cross-linked film...

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Abstract

The invention discloses a composite lignin nanofiltration membrane and a preparation method thereof. The preparation method comprises the following steps: (1) mixing lignin, polyether imide and an organic solvent, carrying out stirring at 25 to 60 DEG C, then carrying out standing and defoaming at 6 to 25 DEG C so as to prepare a membrane casting liquid, smearing a smooth surface of a non-woven fabric with the membrane casting liquid, standing the non-woven fabric, then placing the non-woven fabric into deionized water for soaking, taking the non-woven fabric out and drying moisture through absorption so as to obtain a base membrane, wherein the smooth surface of the non-woven fabric with the smeared membrane casting liquid is called as surface A; (2) immersing the surface A in a methanol solution of ethene diamine, carrying out soaking, taking the surface A out and washing the surface A with deionized water so as to obtain a cross-linked membrane; and (3) soaking the surface A of the cross-linked membrane in an aqueous solution of m-phenylenediamine, taking the surface A of the cross-linked membrane out, draining moisture through absorption, then soaking the surface A in a hexane solution of trimesoyl chloride, taking the surface A out and carrying out air drying so as to obtain the composite lignin nanofiltration membrane. The preparation method has the advantages of usage of cheap and easily available raw materials, simple process and rapid reaction; and the obtained composite lignin nanofiltration membrane has high flux and high separation selectivity.

Description

technical field [0001] The invention relates to a lignin 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, like reverse osmosis and ultrafiltration, is a pressure-driven membrane process. Nanofiltration membranes are between reverse osmosis and ultrafiltration membranes in terms of performance, and 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, etc., and this separation field is generally unreachable by ultrafiltration membranes. The nanofiltration membrane is more "loose" than the reverse osmosis membrane, which allows some salt and organic matter to pass through, so that the ope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/74B01D67/00
Inventor 李韡张金利周阿洋娄利亚
Owner TIANJIN UNIV
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