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Application of functional ionic liquid and method for extracting lithium from salt lake brine

An ionic liquid and extraction technology, applied in the field of extraction, can solve problems such as equipment corrosion, environmental pollution, and lack of lithium extraction function, and achieve the effect of reducing corrosion

Active Publication Date: 2018-08-14
INST OF PHARMACY SHANDONG PROV ACAD OF MEDICAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These kinds of extraction methods are characterized by high extraction efficiency, but the disadvantages are serious equipment corrosion, large extraction solvent loss, and pollution to the environment.
[0004] The patent document whose publication number is CN104263970A discloses "an extractant for lithium ions". Tributyl phosphate is used as the extractant, and ionic liquid is used as the solvent. The ionic liquid itself does not have the function of extracting lithium. Large, resulting in longer stratification time and lower extraction efficiency

Method used

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  • Application of functional ionic liquid and method for extracting lithium from salt lake brine
  • Application of functional ionic liquid and method for extracting lithium from salt lake brine
  • Application of functional ionic liquid and method for extracting lithium from salt lake brine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The extractant is 4-N, N, dimethyl-N'-diethylcarbonylethylpyridine hexafluorophosphate, and its structural formula is as follows:

[0050]

[0051] 【resolve resolution】

[0052] Add 26.65g of diethylamine, 80ml of 1,2-dichloroethane and 12.12g of triethylamine into a 500ml three-necked flask, place the system in an ice-salt bath and drop it below zero, and add 11.2g of ethyl chloride dropwise. 35 ml of 1,2-dichloroethane solution of acid chloride, the rate of addition is controlled to ensure that the reaction temperature is maintained within 10°C. After the dropwise addition, the reaction system was transferred to room temperature and reacted for 3 h.

[0053] Add 100ml of 1M hydrochloric acid solution dropwise to quench the experiment, let stand, separate the phases, and keep the organic phase; the organic phase was washed with 100ml of 1M sodium hydroxide solution, 100ml of water, and 100ml of saturated brine, and finally dried over anhydrous sodium sulfate. Afte...

Embodiment 2

[0059] The extractant is 4-N, N, dimethyl-N'-diethylcarbonylpropylpyridine hexafluorophosphate, and its structural formula is as follows:

[0060]

[0061] 【resolve resolution】

[0062] Add 25.42g of diethylamine, 70ml of 1,2-dichloroethane and 22.26g of triethylamine into a 500ml three-necked flask, place the system in an ice-salt bath and drop it below zero, and add 16.09g of 3- 48 ml of 1,2-dichloroethane solution of chloropropionyl chloride, the rate of addition is controlled to ensure that the reaction temperature is maintained within 10°C. After the dropwise addition, the reaction system was transferred to room temperature and reacted for 3 h.

[0063] Add 150ml of 1M hydrochloric acid solution dropwise to quench the experiment, let it stand, separate the phases, and keep the organic phase; the organic phase was successively washed with 150ml of 1M sodium hydroxide solution, 150ml of water, and 150ml of saturated saline, and finally dried with anhydrous sodium sulfat...

Embodiment 3

[0069] The extractant is 4-N, N, dimethyl-N'-bis(2-ethylhexyl)carbonylpropylpyridine hexafluorophosphate, and its structural formula is as follows:

[0070]

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PUM

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Abstract

The invention discloses the application of a functional ionic liquid and a method for extracting lithium from salt lake brine, belonging to the field of extraction technology. The organic phase of the extraction system of the method includes a functionalized ionic liquid, and the ionic liquid contains an amide group interacting with lithium, which can reduce the interference of other ions. Compared with the prior art, the extraction method of the present invention has the characteristics of low cost, simple operation, high extraction efficiency, cleanness and environmental protection, and has important application value.

Description

technical field [0001] The invention relates to the technical field of extraction, in particular to the application of a functional ionic liquid and a method for extracting lithium from salt lake brine. Background technique [0002] Lithium is the lightest metal and is widely used in lithium batteries, nuclear power generation, aerospace, laser, medicine, functional materials and other fields. Global lithium resources are mainly concentrated in Bolivia, Chile, China, Argentina and other countries, of which about 66% of lithium is stored in salt lake brine. my country's salt lakes are rich in lithium resources, especially the Qaidam Basin in Qinghai, which accounts for more than half of the country's salt lake lithium reserves. Due to the high content of associated magnesium, the properties of magnesium and lithium are very close, making the separation and extraction of lithium very difficult. [0003] Extraction method is one of the lithium extraction methods that have been...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B26/12C22B3/36
CPCC22B26/12C22B3/362Y02P10/20
Inventor 王延风路文娟杨路平张平平张晓梅矫春鹏周亚楠
Owner INST OF PHARMACY SHANDONG PROV ACAD OF MEDICAL SCI
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