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Polymer hybrid microporous separation membrane as well as preparation method and application thereof

A polymer and separation membrane technology, applied in chemical instruments and methods, semi-permeable membrane separation, membrane, etc., can solve the problems of complex synthesis steps, high cost, incomplete stripping, etc.

Pending Publication Date: 2021-09-17
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the extremely similar physical and chemical properties of adjacent rare earth ions, and they often coexist in minerals, the separation of adjacent rare earth elements is very difficult.
[0003] At present, solvent extraction technology is the main process for producing a single high-purity rare earth product, but it has defects such as low efficiency, incomplete stripping, large acid and alkali consumption, and large amount of volatile organic solvents in the separation of heavy rare earths.
The membrane separation method integrates the extraction and stripping process. Although it has the advantages of less acid, alkali and volatile organic solvents, high efficiency and green advantages, the membrane fouling will lead to the deterioration of the membrane separation performance during the long-term use of the adjacent rare earth separation.
[0004] At present, polymer separation membranes are mainly modified by chemical modification and physical blending modification. The chemical modification method usually has complicated synthesis steps, high cost, and is difficult to apply and popularize; the polymer separation membrane modified by physical blending is There is a disadvantage of poor load stability after long-term use

Method used

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  • Polymer hybrid microporous separation membrane as well as preparation method and application thereof
  • Polymer hybrid microporous separation membrane as well as preparation method and application thereof
  • Polymer hybrid microporous separation membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Preparation of ethylene-vinyl alcohol random copolymer:

[0043] Take a 100ml three-neck round flask, dissolve 10g of 27 mole% ethylene-vinyl acetate copolymer in 30ml of toluene at 60°C, then add 20ml of methanol-NaOH solution with a concentration of 3mol / L, heat to 80°C, and stir the reaction 8 h. After the reaction is over, pour the reaction solution into 200ml of cold HCl aqueous solution with a concentration of 1mol / L for neutralization, filter to obtain a precipitate, and repeatedly wash the precipitate with distilled water and methanol in a Buchner funnel to remove water-soluble Inorganic salts were obtained to obtain ethylene-vinyl alcohol random copolymers with 27 mole% ethylene, and dried in a vacuum oven at 40°C overnight.

[0044] (2) Preparation of casting solution:

[0045] Dissolve 0.65g of PVDF and 0.10g of ethylene-vinyl alcohol random copolymer in 10mL of N, N'-dimethylacetamide, and stir for 24 hours in a water bath at 70°C. After all dissolve, ...

Embodiment 2

[0051] In this example, when preparing a polymer hybrid microporous separation membrane, the molar ratio of ethylene in the ethylene-vinyl alcohol random copolymer and the mass fraction of PVDF, ethylene-vinyl alcohol random copolymer, and Cyanex272 were adjusted to explore different Changes in the hydrophilicity of the polymer hybrid microporous separation membrane prepared under different conditions. The preparation method and adsorption separation operation conditions of the polymer hybrid microporous membrane in this example are basically the same as those in Example 1, and the specific addition amounts of each raw material are shown in Table 1.

[0052] Table 1. The amount of raw materials used in polymer hybrid microporous membranes

[0053]

[0054] image 3 It is a comparison chart of water contact angle values ​​of polymer hybrid microporous membranes with different ethylene molar contents, and the prepared polymer hybrid microporous membranes are the above-mentio...

Embodiment 3

[0062] In this example, when preparing the polymer hybrid microporous separation membrane, the mass fractions of PVDF, ethylene-vinyl alcohol random copolymer, and Cyanex272 were adjusted to explore the pair of polymer hybrid microporous separation membranes prepared under different conditions. Changes in the equilibrium adsorption capacity of ytterbium and lutetium.

[0063] The preparation method and adsorption separation operation conditions of the polymer hybrid microporous membrane in this example are basically the same as those in Example 1, and the specific addition amounts of each raw material are shown in Table 1. The size of the equilibrium adsorption capacity investigated in this implementation, the specific operation steps are as follows:

[0064] Accurately pipette the rare earth standard solution and prepare a 20 mg / L rare earth chloride solution with deionized water. Add dilute hydrochloric acid (1 mol L -1 ) or dilute ammonia (1 mol L -1 ) to adjust the pH o...

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Abstract

The invention provides a polymer hybrid microporous separation membrane as well as a preparation method and application thereof, and belongs to the technical field of material preparation and separation. According to the invention, polyvinylidene fluoride (PVDF) is used as a membrane matrix, an ethylene-vinyl alcohol random copolymer is used as a hydrophilic component to be added, and bis (2, 4, 4-trimethylpentyl) hypophosphorous acid Cyanex272 is used as a membrane carrier, so that the polymer hybrid microporous separation membrane is prepared, the surface and internal pore structures of the polymer hybrid microporous separation membrane are rich, and the polymer hybrid microporous separation membrane has good hydrophilicity; the polymer hybrid microporous separation membrane has good application in separation of adjacent heavy rare earth ytterbium and lutetium.

Description

technical field [0001] The invention belongs to the technical field of material preparation and separation, and in particular relates to a polymer hybrid microporous separation membrane and a preparation method and application thereof. Background technique [0002] The incorporation of trace amounts of high-purity rare earths will significantly improve product performance, so rare earth elements are widely used in communications, medical care, energy, and defense. However, because the physical and chemical properties of adjacent rare earth ions are very similar, and they often coexist in minerals, the separation of adjacent rare earth elements is very difficult. [0003] At present, solvent extraction technology is the main process for producing a single high-purity rare earth product, but it has defects in the separation of heavy rare earths, such as low efficiency, incomplete stripping, large consumption of acid and alkali, and large amount of volatile organic solvents. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/34C22B3/24C22B59/00
CPCB01D67/0011B01D69/02B01D71/34C22B3/24C22B59/00B01D2325/025B01D2325/36Y02P10/20
Inventor 陈厉董欢戴静闻潘为国
Owner JIANGSU UNIV
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