Benzo crown ether graft polymer material with lithium isotope separation effect and preparation method thereof

A technology of grafting polymer and separation effect, applied in the field of lithium isotope separation, can solve the problem of low single-stage separation factor of lithium isotope, and achieve the effects of efficient separation and continuous production, high solid loading and simple preparation process

Inactive Publication Date: 2013-02-06
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Firstly, the lithium isotope is separated by the method of ion-exchange chromatographic column. The lithium isotope adsorbed in the resin is difficult to elute. In addition, the crown ether and cryptate r

Method used

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  • Benzo crown ether graft polymer material with lithium isotope separation effect and preparation method thereof
  • Benzo crown ether graft polymer material with lithium isotope separation effect and preparation method thereof
  • Benzo crown ether graft polymer material with lithium isotope separation effect and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The preparation method of 4-aminobenzo 15 crown 5 grafted polysulfone polymer material is as follows: Weigh dry 2g polysulfone and place it in a four-necked flask, add dichloromethane to dissolve it completely, then add 5ml 1, 4-Dichloromethoxybutane and 0.5ml of anhydrous tin tetrachloride react at room temperature for 3 hours, then precipitate it in methanol, and dry it in a vacuum drying oven at 60°C to obtain the degree of substitution Chloromethylated polysulfone of about 1.5. Weigh 1g of chloromethylated polysulfone and dissolve it in 100mL of DMF, add 0.2g of 4-aminobenzo15crown 5 and 0.010g of anhydrous potassium carbonate and mix evenly, control the temperature at 48±2°C for 5h, pour the reaction system into Precipitate in methanol, suction filter to obtain the precipitate, wash several times with methanol and then dry to obtain a crown ether grafted polysulfone polymer material with a crown ether immobilization capacity of 0.1 mmol / g. The single-stage separat...

Embodiment 2

[0029] The preparation method of 4-hydroxybenzo15crown5-grafted polysulfone polymer is as follows: use the same method as above to prepare chloromethylated polysulfone with a degree of substitution of about 1.5, and then weigh 1g of chloromethylated polysulfone Dissolve polysulfone in 10mL of DMF, add 1g of 4-hydroxybenzo-15crown 5 and 0.488g of anhydrous potassium carbonate and mix evenly, control the temperature at 75±5°C for 24 hours, pour the reaction system into methanol to precipitate, and filter to obtain the precipitate The material was washed several times with methanol and then dried to obtain a grafted polymer material with a crown ether immobilization capacity of 2.0 mmol / g. The single-stage separation factor of the grafted polymer material for lithium isotopes obtained by liquid-solid extraction was 1.068.

Embodiment 3

[0031] The method for grafting polysulfone polymer materials with 4-aminobenzo12crown4 is as follows: the same method is used to prepare chloromethylated polysulfone with a degree of substitution of about 1.0, and accurately weigh 1g of chloromethylated polysulfone Dissolve sulfone in 20mL of DMAA, add 0.4g of 4-aminobenzo12crown 4 and 0.30g of triethylamine and mix evenly, control the temperature at 60±2°C for 12h, pour the reaction system into ethanol to precipitate, and filter to obtain the precipitate. After being washed several times with ethanol and then dried, a benzocrown ether grafted polysulfone polymer material with a crown ether immobilization amount of 1.0 mmol / g was obtained. The single-stage separation factor of polymer material to lithium isotope was 1.043 by liquid-solid extraction.

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Abstract

The invention provides a benzo crown ether graft polymer material with lithium isotope separation effect and a preparation method of the material. The polymer is a benzo crown ether graft polymer which is formed by taking polysulfone, polyethersulfone or polyetheretherketone containing a chloromethyl group as a substrate and benzo crown ether as a side hanging group and connecting by chemical bonds. The preparation process of the polymer is as follows: preparing chloromethylated polymer under the action of proper catalyst and chloromethylation reagent; and carrying out unimolecular nucleophilic substitution reaction on the chloromethylated polymer and benzo crown ether with an active functional group at certain temperature under the action of an acid-binding agent to finish chemical graft so as to prepare the benzo crown ether graft polymer. The benzo crown ether graft polymer contains a crown ether group, thereby having excellent lithium isotope separation characteristic; and in addition, by adjusting the size of the crown ether ring, the graft polymer can be used for identification and separation of heavy metal ions and has wide application prospects.

Description

technical field [0001] The invention belongs to the field of lithium isotope separation, in particular to a graft polymer with lithium isotope separation effect and a preparation method thereof, specifically a benzocrown ether grafted polysulfone and benzocrown ether with lithium isotope separation effect A polymer material grafted with polyethersulfone or benzocrown ether grafted with polyether ether ketone and a preparation method thereof. Background technique [0002] Lithium (Li) is the lightest metal in the world. There are abundant lithium resources in the world. Natural lithium consists of 6 Li and 7 Li is composed of two stable isotopes, and their abundances are about 7.5% and 92.5%, respectively. 6 Li and 7 Li has completely different nuclear properties, but both play an extremely important role in nuclear reactions. 6 After Li is bombarded by neutrons, tritium and helium are generated, so that tritium in the fusion reactor can continue to proliferate, so 6 Li ...

Claims

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Application Information

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IPC IPC(8): C08G83/00
Inventor 李建新严峰程煜裴艳春何本桥崔振宇
Owner TIANJIN POLYTECHNIC UNIV
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