A preparation method of high-efficiency recyclable lithium extraction membrane material for salt lake brine

A salt lake brine, high-efficiency technology, applied in chemical instruments and methods, water/sewage treatment, adsorption water/sewage treatment, etc., can solve the problems of unfavorable recycling, serious dissolution loss of lithium extraction, etc. The effect of fast desorption speed and convenient operation

Active Publication Date: 2021-03-30
SHANXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the problem that the lithium extraction by the existing adsorption method has serious dissolution loss and is not conducive to recycling, and provides a method for preparing a highly efficient and recyclable lithium extraction membrane material for salt lake brine. The lithium extraction membrane material prepared by this method has selective Good performance, high adsorption rate, simple process, convenient operation, etc., and the material can use light to control adsorption and desorption, reducing the use of clean water in the desorption process

Method used

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  • A preparation method of high-efficiency recyclable lithium extraction membrane material for salt lake brine
  • A preparation method of high-efficiency recyclable lithium extraction membrane material for salt lake brine

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Embodiment 1

[0020] A method for preparing a high-efficiency recyclable membrane adsorption material suitable for high-magnesium-lithium ratio salt lake brine, the steps are as follows:

[0021] a. Dissolve 2,3,3-trimethylindole (3.18 g, 20 mmol) and 3-bromopropionic acid (6.08 g, 40 mmol) in 50 mL of acetonitrile, react at 85 °C for 22 h, and stop the reaction Afterwards, cool to room temperature, evaporate the solvent, wash the residue 3 times with ether, recrystallize with a mixed solution of dichloromethane: acetone = 1:5, filter with suction, and dry in vacuo to obtain product A;

[0022] b. Dissolve product A (3.11 g, 10 mmol) and 5-nitrosalicylaldehyde (1.85 g, 12 mmol) in 50 mL of absolute ethanol, drop into 7 mL of triethylamine, and react in the dark at 80 °C for 24 h, after the reaction stops, cool to room temperature, add deionized water, adjust the pH to acidic with dilute hydrochloric acid, filter with suction, and wash with deionized water for 3 times. Vacuum drying obtains...

Embodiment 2

[0026] (1) Configure Mg 2+ 、Na + 、K + , Li + The solutions with concentrations of 5 mg / L, 5 mg / L, 5 mg / L, and 1 mg / L were used as simulated brine for adsorption experiments, and the prepared membranes were subjected to adsorption experiments, and the maximum adsorption capacity was measured to be 28.7 mg / g, After 10 cycles, the adsorption capacity can still reach 98.3% of the maximum adsorption capacity.

[0027] (2) Configure Mg 2+ 、Na + 、K + , Li + The solutions with concentrations of 8 mg / L, 8 mg / L, 8 mg / L, and 1 mg / L were used as simulated brine for adsorption experiments, and the prepared membranes were subjected to adsorption experiments, and the maximum adsorption capacity was measured to be 26.3 mg / g, After 10 cycles, the adsorption capacity can still reach 96.1% of the maximum adsorption capacity.

[0028] (3) Configure Mg 2+ 、Na + 、K + , Li + The solutions with concentrations of 10 mg / L, 10 mg / L, 10 mg / L, and 1 mg / L were used as simulated brine for adsorp...

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Abstract

The invention relates to a preparation method for a high-efficiency recyclable lithium extraction film material for salt lake brine, and belongs to the technical field of salt lake brine lithium extraction. The method can solve the problem that current adsorption method lithium extraction has serious dissolution loss and is not conducive to recycling. The method uses selective complexing ability of a crown ether structure to alkali metal ions, 1-aza-12-crown-4 is used as a selective complexing group of lithium ions, a spiropyran compound with photoisomerization properties is used to modify thecrown ether to obtain a ''spiropyran-crown ether'' compound with high-efficiency selective adsorption to the lithium ions, and the adsorption and desorption to the lithium ions by the compound can becontrolled by illumination; the compound is immobilized on polyvinylidene fluoride to prepare the recyclable lithium extraction adsorption membrane material; and the material has good selectivity forthe lithium ions, large adsorption capacity, and low consumption of fresh water during desorption, is suitable for the lithium extraction process of the salt lake brine with a high magnesium-to-lithium ratio, and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of lithium extraction from salt lake brine, and in particular relates to a preparation method of an efficient and recyclable lithium extraction film material for salt lake brine with a high magnesium-to-lithium ratio. Background technique [0002] Since the beginning of this century, with the increasing demand for global mobile electronic equipment and the rapid development of new energy vehicles, the demand for lithium resources has increased sharply; metal lithium and its compounds are widely used in the aerospace industry, nuclear power industry, and ultra-light high-strength alloys Materials and other fields have a very wide range of applications, and lithium resources have become an indispensable strategic resource in modern industry. [0003] Lithium metal mainly exists in salt lake brine, underground brine and seawater in the form of lithium ions. Among them, extracting lithium from salt lake brine h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/16C08L39/06C08K5/35C08J5/18B01J20/26B01J20/28B01J20/30C02F1/28C07D491/107
CPCB01J20/261B01J20/28033C02F1/288C07D491/107C08J5/18C08J2327/16C08J2339/06C08K5/35
Inventor 李恩泽叶培远康锦崔莉成怀刚程芳琴
Owner SHANXI UNIV
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