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High-selectivity nanofiltration membrane as well as preparation method and application thereof

A high-selectivity, nanofiltration membrane technology, applied in the field of membrane separation, can solve problems such as clogging, reduced lithium ion extraction efficiency, and reduced separation efficiency

Pending Publication Date: 2022-08-09
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high positive charge also improves the electrostatic repulsion of the nanofiltration membrane to the monovalent cation-lithium ions, which reduces the transmission rate of lithium ions, thereby significantly reducing the extraction efficiency of lithium ions.
In addition, polyethyleneimine is a flexible molecule. After grafting, it is usually tiled on the surface of the nanofiltration membrane to increase the thickness of the separation layer, or even block the separation pores on the surface of the nanofiltration membrane, which significantly reduces the permeation flux of the nanofiltration membrane, thereby reducing the separation efficiency.

Method used

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  • High-selectivity nanofiltration membrane as well as preparation method and application thereof
  • High-selectivity nanofiltration membrane as well as preparation method and application thereof
  • High-selectivity nanofiltration membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] First, configure the following solution:

[0050] 3.0wt% of piperazine, 1.0wt% of triethylamine aqueous phase mixed solution (1); 1.0wt% of 1,3,5-benzenetricarbonyl chloride n-hexane organic phase solution (2); and 3.0wt% of paraben Aminosalicylic acid-ethanol solution (3).

[0051] Then, the polyethersulfone / sulfonated polysulfone-based membrane is contacted with the aqueous phase solution (1) for 2 minutes, and after being taken out, the excess aqueous phase solution on the surface is removed with a roller or an air knife; then the membrane and the organic phase solution are removed. (2) contact for 5 minutes, complete the interfacial polymerization reaction, form a polyamide layer, and then remove the excess organic phase solution on the surface; then contact the film with the p-aminosalicylic acid-ethanol solution (3) for 10 minutes to complete the connection. branch reaction; then remove the superfluous solution on the surface, soak the membrane in the 2000ppm sol...

Embodiment 2

[0053] First, configure the following solution:

[0054] Mixed aqueous phase solution of 0.5wt% piperazine and 0.5wt% triethylamine (1); 0.1wt% 3,3',5,5'-biphenyltetracarbonyl chloride n-hexane organic phase solution (2) ; 0.1 wt% p-aminobenzoic acid-ethanol solution (3).

[0055] Then, the polyethersulfone porous membrane is used as the base membrane to contact the aqueous phase solution (1) for 2 minutes, and after taking out, the excess aqueous phase solution on the surface is removed with a roller or an air knife; then the membrane and the organic phase solution (2) are removed. ) contact for 1 minute, complete the interfacial polymerization reaction, form polyamide layer, then remove the superfluous organic phase solution on the surface; Then the film is contacted with the 4-aminophthalic acid-water solution (3) for 1 minute to complete the grafting reaction; Then, the excess solution on the surface was removed, and the membrane was immersed in a 1000 ppm solution prepar...

Embodiment 3

[0057] First, configure the following solution:

[0058] 2.0wt% piperazine, 0.5wt% triethylamine mixed aqueous phase solution (1); 0.5wt% 1,3,5-benzenetricarbonyl chloride n-hexane organic phase solution (2); 0.5wt% paraffin Aminosalicylic acid-ethanol solution (3).

[0059] Then, the polysulfone ultrafiltration base membrane is contacted with the aqueous phase solution (1) for 2 minutes, and after being taken out, the excess aqueous phase solution on the surface is removed with a roller or an air knife; then the membrane is contacted with the organic phase solution (2) In 30 seconds, the interfacial polymerization reaction was completed to form a polyamide layer, and then the excess organic phase solution on the surface was removed; then the film was contacted and reacted with the p-aminosalicylic acid-ethanol solution (3) for 3 minutes to complete the grafting reaction; then Remove the excess solution on the surface, and then soak the membrane in the 5000ppm solution prepar...

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Abstract

The invention discloses a high-selectivity nanofiltration membrane. The surface of the nanofiltration membrane is grafted with a micromolecular amino aromatic compound containing a chelating group; optionally, the small-molecule amino aromatic compound is further chelated with metal cations through the chelating group of the small-molecule amino aromatic compound. The membrane has a high lithium-magnesium separation factor, shows good magnesium-lithium separation efficiency and lithium extraction efficiency, and has a good application prospect in the field of salt lake lithium extraction. The invention further relates to a preparation method and application of the nanofiltration membrane.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a high-selectivity nanofiltration membrane, a preparation method and application thereof, and the membrane can be particularly used for efficient separation of magnesium and lithium. Background technique [0002] Lithium resource is an important metal resource and is widely used in alloy manufacturing, ceramics, new energy and other industries. Lithium resources in salt lakes in China account for 86.5% of the proven lithium resources in China. Lithium ions in most salt lakes coexist with many multivalent ions, typically magnesium ions, and their content is relatively high. Since magnesium ions and lithium ions have similar chemical properties and hydration ion radius, they cause great interference to the extraction of lithium from salt lakes, making the separation of magnesium and lithium a key step in the process of lithium extraction from salt lakes. Am...

Claims

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Application Information

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IPC IPC(8): B01D61/00B01D67/00B01D65/00B01D69/02B01D69/04B01D69/06B01D69/12B01D71/64B01D71/68B01D65/10
CPCB01D61/027B01D69/02B01D69/125B01D71/68B01D71/64B01D69/06B01D69/04B01D69/12B01D65/10B01D2323/38Y02P10/20Y02A20/131
Inventor 何本桥刘阳河李全李建新赵瑞
Owner TIANJIN POLYTECHNIC UNIV
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