Phase change energy storage material prepared from oleic acid or esters of energy storage material and preparation method thereof

A phase change energy storage material, ethyl oleate technology, is applied in the field of phase change energy storage materials and their preparation, and achieves the effects of large latent heat of phase change, controllable phase change temperature and low price.

Active Publication Date: 2011-04-13
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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Problems solved by technology

[0005] Commonly used solid-liquid organic phase change materials such as paraffins, straight-chain saturated fatty acids, and straight-chain saturated fatty alcohols have a phase transition temperature lower than 76°C, and there is no such material with a phase transition temperature higher than 90°C. Therefore, it is of great significance to obtain organic phase change energy storage materials with high phase transition temperature through modification

Method used

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  • Phase change energy storage material prepared from oleic acid or esters of energy storage material and preparation method thereof
  • Phase change energy storage material prepared from oleic acid or esters of energy storage material and preparation method thereof
  • Phase change energy storage material prepared from oleic acid or esters of energy storage material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] 1. Add 50g formic acid, 80g hydrogen peroxide, and 0.2g phosphoric acid to 50g oleic acid, control the reaction temperature to 45°C, stir and reflux, and react for 4h; after the reaction stops, remove the water phase and take the oil layer.

[0027] 2. Add 150 g of 7% sodium hydroxide solution to the oil layer, control the reaction temperature to 80°C, stir and reflux, and react for 2 hours. After the reaction stops, add hydrochloric acid to make it acidic, precipitate out, and filter with suction.

[0028] 3. The precipitate was recrystallized with 95% ethanol to obtain a white solid powder, which was dried naturally to obtain a phase change energy storage material.

[0029] The material prepared above was analyzed by GCMS-QP2010, and compared with the standard spectrum, it was determined that the substance was C 18 h 36 o 4 , its hydroxyl value was measured to be 342mgKOH / g, thus its structure can be determined as CH 3 (CH 2 ) 7 CHOH-CHOH (CH 2 ) 7 COOH. The p...

example 2

[0031] 1. Add 40g of formic acid and 70g of hydrogen peroxide to 50g of methyl oleate, control the reaction temperature to 55°C, stir and reflux, and react for 8h; after the reaction stops, remove the water phase and take the oil layer.

[0032] 2. Add 200 g of 10% sodium hydroxide solution to the oil layer, control the reaction temperature to 90°C, stir and reflux, and react for 4 hours. After the reaction stops, add hydrochloric acid to make it acidic, precipitate out, and filter with suction.

[0033] 3. The precipitate was recrystallized with acetone to obtain a white solid powder, which was naturally dried to obtain a phase change energy storage material.

[0034] The material prepared above was analyzed by GCMS-QP2010 as C 18 h 36 o 4 , the hydroxyl value is 360mgKOH / g, and the STA409PC / PG comprehensive thermal analyzer of Germany is used for detection. The phase transition peak temperature of the melting curve of the material is 130°C, and the latent heat of phase tra...

example 3

[0036] Take 20 g of the product obtained in Example 2, add 100 ml of methanol and 3 ml of concentrated sulfuric acid, stir and reflux at 55 ° C for 6 h, and rotate to evaporate the alcohol after the reaction is stopped. The product is washed to neutral and naturally dried to obtain a white solid. Analyzed as C 19 h 38 o 4 , the hydroxyl value is 338mgKOH / g, and the German NETZSCH STA409PC / PG comprehensive thermal analyzer is used for detection. It is measured that the phase transition peak temperature of the melting curve of the material is 106°C, and the phase transition latent heat is 147J / g.

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Abstract

A phase change energy storage material prepared from oleic acid or esters of the energy storage material is characterized in that the general molecular formula of the material is CH3(CH2)7CHOH-CHOH(CH2)7COOR, wherein R is H, CH3 or CH2CH3. The material belongs to the compound of fatty acid derivatives and has phase change temperature between 35 DEG C and 130 DEG C and phase change latent heat of 110-206kJ/kg. The material has the advantages of controllable phase change temperature and wider range of phase change temperature.

Description

technical field [0001] The invention belongs to a phase change material and a preparation method, in particular to a phase change energy storage material prepared from oleic acid or its esters and a preparation method thereof. technical background [0002] In recent years, the problem of energy shortage is one of the problems that the country needs to solve urgently. In the national "Eleventh Five-Year" scientific and technological research projects, the research work of energy-saving materials is very important. The use of phase change materials to realize energy storage and utilization is helpful to improve energy utilization efficiency. It is a very active frontier research direction in the fields of energy science and material science in recent years. [0003] Phase change energy storage materials use materials to absorb or release heat during the phase change process to store or release energy. They have the characteristics of high heat storage density, approximately is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06C07C51/367C07C59/105C07C67/31C07C69/675
Inventor 侯相林贾时宇邓天昇
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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