Preparation method of choline chloride type magnesium eutectic solvent

A technology of deep eutectic solvent and choline chloride, which is applied in the field of electrolytic solvent preparation to achieve the effects of reducing energy, simple process, and eliminating the problem of water influence

Inactive Publication Date: 2011-01-05
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many kinds of ammonia dehydration processes. Due to the limitations of the methods, none of them have been applied in industrial production so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1 A kind of preparation method of choline chloride type magnesium deep eutectic solvent, this method is that 10.165g magnesium chloride hexahydrate and 62.071g ethylene glycol are mixed with molar ratio as 1: 20 ratio, heated to 180 ℃, and Distill at this temperature for 2 hours to remove moisture to obtain magnesium chloride-ethylene glycol solution that has completely removed moisture. The water content in the Karl Fischer coulometric titration detection system is 0.159%; then the magnesium chloride that has completely removed moisture- Ethylene glycol solution is mixed with 69.811g choline chloride, wherein the mol ratio of ethylene glycol and choline chloride is 2: 1, this mixture is electromagnetically stirred at 70°C for 2 hours, and finally sealed and air-insulated at room temperature, A liquid magnesium deep eutectic solvent can be obtained.

[0016] The solvent is a homogeneous, stable, colorless and transparent liquid at room temperature. The visco...

Embodiment 2

[0017] Example 2 A method for preparing a choline chloride-type magnesium deep eutectic solvent, mixing 8.350g of magnesium chloride tetrahydrate and 46.045g of glycerol in a molar ratio of 1:10, heating to 200°C, and distilling at this temperature After 2.5 hours, the moisture was removed to obtain the magnesium chloride-glycerol solution that had completely removed the moisture, and the water content in the detection system by Karl Fischer coulometric titration was 0.019%; Choline is mixed, wherein the molar ratio of glycerol to choline chloride is 3:1, the mixture is electromagnetically stirred at 80° C. for 3 hours, and finally sealed and isolated from air at room temperature to obtain a liquid magnesium deep eutectic solvent.

[0018] The solvent is a homogeneous, stable, colorless and transparent liquid at room temperature. The viscosity at 70°C is 137.5mp·s, and the conductivity is 6.53ms / cm. The electrochemical test shows that the system has good electrochemical stabil...

Embodiment 3

[0019] Embodiment 3 A kind of preparation method of choline chloride type magnesium deep eutectic solvent, this method is that 6.550g magnesium chloride dihydrate and 26.015g malonic acid are mixed with molar ratio as 1: 5 ratio, heated to 130 ℃, and Distill at this temperature for 3 hours to remove moisture to obtain magnesium chloride-malonic acid solution that has been completely dehydrated, and the water content in the Karl Fischer coulometric titration detection system is 0.368%; Malonic acid solution is mixed with 34.905g choline chloride, and wherein the mol ratio of malonic acid and choline chloride is 1: 1, this mixture is electromagnetically stirred at 75 ℃ for 1 hour, and finally sealed and isolated from air at room temperature, A liquid magnesium deep eutectic solvent can be obtained.

[0020] The solvent is a homogeneous, stable, colorless and transparent liquid at room temperature. The viscosity at 70°C is 235mp·s, the electrical conductivity is 7.21ms / cm, and t...

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Abstract

The invention relates to a preparation method of a choline chloride type magnesium eutectic solvent, which comprises the following steps of: mixing aqueous magnesium chloride and a ligand according to the mol ratio of 1:5-1:20, heating for melting at the temperature of 100-200 DEG C, and distilling for 0-3 hours at the temperature to obtain a completely dehydrated magnesium chloride-ligand solution; and then mixing the completely dehydrated magnesium chloride-ligand solution and choline chloride, stirring for 1-3 hours at the temperature of 70-90 DEG C, and finally sealing at room temperature to obtain a liquid magnesium eutectic solvent, wherein the mol ratio of the ligand to the choline chloride is 1:1-3:1. The invention has simple process and low cost, can eliminate the moisture influence problem in the electrodeposition process and is superior to traditionally operated magnesium smelting by a pidgeon process and metallic magnesium production by an electrolytic process in the aspects of reducing the energy source and resource consumption, reducing the environment pollution and the like.

Description

technical field [0001] The invention relates to a preparation method of an electrolytic solvent that can be used for electrodepositing magnesium or magnesium alloys, in particular to a preparation method of a choline chloride type magnesium deep eutectic solvent. Background technique [0002] The reserves of magnesium resources in salt lakes in my country are huge, and the reserves of magnesium chloride in Chaerhan Salt Lake in Qinghai are particularly rich. The natural evaporation in the Qaidam Basin is large, and the old brine can obtain bischofite (MgCl 2 ·6H 2 O, magnesium chloride hexahydrate), bischofite is an important raw material for the production of high-purity magnesia and anhydrous magnesium chloride for electrolysis. However, due to technical, economic, environmental and other issues, magnesium resources in salt lakes have not been able to be developed and comprehensively utilized on a large scale. A large amount of magnesium salts discharged during potassium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/04
Inventor 景燕岳都元贾永忠孙进贺马军姚颖王小华
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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