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Extraction composition, extraction system and application thereof

A composition and extraction technology, applied in the directions of lithium compounds, solvent extraction, alkali metal compounds, etc., can solve the problems of long process, complicated operation, insufficient extraction rate and back-extraction performance, etc.

Active Publication Date: 2017-12-08
SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to overcome the existing extraction systems and processes for extracting lithium salts from lithium-containing brines, such as lengthy process, cumbersome operation, strong corrosion to equipment, insufficient extraction rate and stripping performance, etc. Technical problem, and provide a kind of extraction composition, extraction system and its application

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  • Extraction composition, extraction system and application thereof
  • Extraction composition, extraction system and application thereof
  • Extraction composition, extraction system and application thereof

Examples

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preparation example Construction

[0053] The preparation method of the extractant involved in the following example is as follows:

[0054] General operation of the experiment: In a 2L three-neck flask equipped with a thermometer, a constant pressure dropping funnel, and a mechanical stirrer, add 1mol of dialkylamine, 400mL of dichloromethane, and 153mL (1.1mol) of triethylamine, and turn on the stirring. And let the system cool down to 0°C, at the same time, put 1.05mol of acid chloride and about 200mL of methylene chloride solution in the dropping funnel and start to add dropwise, keeping the system temperature not exceeding 15°C, and the dropwise addition is completed in about 30 minutes. Remove the ice bath and react overnight at room temperature. Add an equal volume of water to dissolve the resulting solid, separate the layers in a separatory funnel, wash the organic phase with dilute hydrochloric acid and saturated brine, and dry with anhydrous sodium sulfate. After removing the solvent, distill under re...

Embodiment 1-9

[0095] Organic phase: extractant + neutral phosphine oxide + diluent;

[0096] Water phase: Lithium-containing brine;

[0097] Compared (O:A): refers to the volume ratio of organic phase and aqueous phase;

[0098] The specific operation is as follows:

[0099] A certain amount of FeCl 3 (co-extraction agent) is added in lithium-containing brine, shakes to dissolve it, then adds organic phase, oscillates to balance (oscillation time is 5 minutes to 30 minutes), stands and separates, and obtains a balanced water phase and an organic phase containing lithium ions. Mutually. Determination of Li in the equilibrium aqueous phase and organic phase, respectively + 、Na + 、K + and Mg 2+ Concentration, from which to calculate the extraction rate of Li, Li + , Mg 2+ 、Na + and K + The distribution ratio of Li / Mg, Li / Na, and Li / K separation coefficients.

Embodiment 10

[0101] Organic phase: extractant + neutral phosphine oxide;

[0102] Water phase: Lithium-containing brine;

[0103] Compared (O:A): refers to the volume ratio of organic phase and aqueous phase;

[0104] The specific operation is as follows:

[0105] A certain amount of FeCl 3 (Co-extraction agent) was added in the organic phase, then added to the water phase, oscillating to balance (the oscillating time was 30 minutes), and standing to separate layers to obtain a balanced water phase and an organic phase loaded with lithium ions. Determination of Li in the equilibrium aqueous phase and organic phase, respectively + 、Na + 、K + and Mg 2+ Concentration, from which to calculate the extraction rate of Li, Li + , Mg 2+ 、Na + and K + The distribution ratio of Li / Mg, Li / Na, and Li / K separation coefficients.

[0106] The lithium-containing brine parameters in Examples 1-10 are shown in Table 1:

[0107] Table 1. Each component and content (mol / L) in lithium-containing bri...

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Abstract

The invention discloses an extraction composition, an extraction system and application thereof. The extraction composition disclosed by the invention comprises an extraction agent and a neutral phosphorus oxide compound of formula A as shown in the description, wherein the extraction agent comprises N,N-di(2-ethylhexyl) acetamide and N,N-dihexyl-2-mehtyl propanamide. As a mixture of amide compounds and the neutral phosphorus oxide compound of specific structures is adopted as the extraction agent, the extraction rate for Li of lithium-containing brine is 80% or greater, for example, 83.41-93.5%; the lithium-magnesium allocation coefficient is as high as 600 or greater, for example, 625-1110; when lithium is reextracted with HCl, the reextraction rate is 85% or greater, for example, 87.55-91.32%, the extraction and reextraction properties for extracting lithium from the lithium-containing brine are greatly improved, the cost is reduced, and industrial production can be relatively well met.

Description

technical field [0001] The invention relates to an extraction composition, an extraction system and applications thereof. Background technique [0002] Lithium not only has important applications in the defense industry, but its importance in the national economy is also becoming increasingly evident, especially in the energy field: 6 Li and 7 Li is an important material for the fuel of future nuclear fusion reactors and for nuclear fission reactions, respectively: it is also in increasing demand as a battery material. Therefore, lithium is known as "the energy metal of the 21st century". The demand for lithium continues to grow at home and abroad, so the research, development and utilization of lithium resources are imminent. [0003] Salt lake brine is an important resource of lithium. my country is rich in salt lake brine lithium resources, and its reserves rank among the top in the world. However, since brine contains a variety of metal ions, its comprehensive utili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D11/04C02F1/26C01D15/00
CPCB01D1/04B01D11/0492C01D15/00C02F1/26
Inventor 袁承业李晋锋
Owner SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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