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Functional group modified phase-change heat-storing ionic liquid

A functional group modification, ionic liquid technology, applied in heat exchange materials, chemical instruments and methods, organic chemistry, etc., can solve the problems of low heat storage density and low heat storage density of alkyl chain ionic liquids, and achieve thermal stability. high sex effect

Pending Publication Date: 2014-09-17
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The phase change heat is mainly affected by electrostatic energy and hydrogen bond energy, and the hydrogen bond energy can be greatly improved by modifying ionic liquids, thereby solving the problem of low heat storage density of alkyl chain ionic liquids
Hydrogen bonds in ionic liquids generally exist between hydrogen atoms and electronegative atoms. Since the number of hydrogen atoms is much greater than the number of electronegative atoms, functional groups with electronegative atoms are introduced into alkyl chain ionic liquids. It can effectively increase the hydrogen bond energy of ionic liquids, thereby solving the problem of low heat storage density

Method used

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  • Functional group modified phase-change heat-storing ionic liquid
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  • Functional group modified phase-change heat-storing ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 1,2-dimethylimidazole and ethyl chloroacetate (molar ratio 1:1.2) into a three-necked flask equipped with a stirrer and a thermometer. The upper part of the flask was refluxed with a condenser tube and nitrogen gas was passed into the three-necked flask through a nitrogen conduit for protection. The raw material was reacted at 70°C for 48 hours to obtain a pale yellow viscous liquid. Distilled under reduced pressure at 50°C, and then washed repeatedly with a small amount of ethyl acetate to remove residual reactants. Dry under vacuum at 70°C to remove the residual ethyl acetate from the previous step to obtain a white powdery solid 1,2-dimethyl-3-carboxyimidazole chloride, which forms a phase transition at a phase transition temperature of 161°C The heat is 105.02J / g ( Figure 15 ) of the ionic liquid, the upper limit of its use temperature is 204°C ( Figure 8 ).

Embodiment 2

[0028] Add 1,2-dimethylimidazole and bromoacetic acid (molar ratio 1:1.2) and solvent ethyl acetate into a three-necked flask equipped with a stirrer and a thermometer. The upper part of the flask was refluxed with a condenser tube and nitrogen gas was passed into the three-necked flask through a nitrogen conduit for protection. The raw material was reacted at 70°C for 48 hours to obtain a pale yellow viscous liquid. Vacuum filtration at 80°C for 2 hours, followed by repeated washing with a small amount of methyl ether to obtain a white powder. After vacuum drying at 70°C to remove the residual methyl ether, a white snowflake-like solid 1,2-dimethyl-3-carboxyimidazole bromide was obtained, and a phase change heat of 57.92J was formed at a phase transition temperature of 148°C / g( Figure 16 ) of the ionic liquid, its use temperature limit is 305 ℃ ( Figure 9 ).

Embodiment 3

[0030] Add 1,2-dimethylimidazole and ethyl bromoacetate (molar ratio 1:1.2) into a three-necked flask equipped with a stirrer and a thermometer. The upper part of the flask was refluxed with a condenser tube and nitrogen gas was passed into the three-necked flask through a nitrogen conduit for protection. The raw material was reacted at 70°C for 48 hours to obtain a pale yellow viscous liquid. Distilled under reduced pressure at 50°C, and then washed repeatedly with a small amount of ethyl acetate to remove residual reactants. Dry under vacuum at 70°C to remove the residual ethyl acetate from the previous step to obtain a white powdery solid 1,2-dimethyl-3-ester imidazole bromide, which forms a phase at a phase transition temperature of 150°C Heat up to 92.95J / g ( Figure 17 ) of the ionic liquid, the upper limit of its use temperature is 238°C ( Figure 10 ).

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Abstract

The invention discloses functional group modified phase-change heat-storing ionic liquid which is characterized by being a type of phase-change heat-storing ionic liquid obtained through modification by introducing different functional groups based on alkyl-chain ionic liquid, wherein the functional groups are functional groups which comprise electric negative atoms and include any one of a carboxyl functional group R-COOH, a hydroxyl functional group R-OH, an ester functional group R-COO-R', a formyl functional group R-COH and an ether functional group, R and R' represent alkyl of which the carbon quantity is 1-4, and the introduction positions of the functional groups are all nitrogen atom positions on a ring structure. After the functional group modification, the prepared ionic liquid has relatively-high specific heat capacity and good thermal stability and can be applied to a high-grade heat source.

Description

technical field [0001] The invention relates to an organic synthetic compound, in particular to an organic phase-change heat storage material. Background technique [0002] With the intensification of the energy crisis worldwide, how to use energy reasonably and efficiently has become the focus of attention. Phase change energy storage technology is a new type of green and efficient energy storage method. It uses phase change materials to absorb heat from the environment or release heat to the environment during the phase change process, thereby achieving the purpose of energy storage and release. Foreign researches on phase change energy storage technology started as early as the 1970s. Affected by the energy crisis in recent years, the basic theory and application technology research of phase change energy storage has risen rapidly and developed continuously in developed regions such as the United States and Europe. [0003] As the core of phase change energy storage tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06C07D233/64C07D213/04C07D223/04
Inventor 杨伯伦张展
Owner XI AN JIAOTONG UNIV
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