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A kind of phase change material and its preparation method using natural acid as raw material

A technology of phase change materials and raw materials, applied in heat exchange materials, chemical instruments and methods, hydrocarbon production from oxygen-containing organic compounds, etc. and other problems, to achieve the effects of easy recycling, large latent heat of product phase transition, and flexible process operation.

Active Publication Date: 2015-11-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above methods can obtain the corresponding n-alkane monomers, there are certain problems in each method: as the first method, the process conditions are more complicated, and the requirements for some equipment and materials are very high; the second method is only applicable For symmetrical even-numbered alkanes, the resulting products need to be extracted repeatedly with ether solvent; the third and fourth methods are very dangerous to operate, and petroleum ether is very easy to erupt in the violent reaction between metal sodium and halogenated alkanes, with low safety factor and high cost
If precision distillation is used to extract various monomeric n-alkanes, and then the even-numbered n-alkanes are mixed to prepare a phase change material with a continuously changing phase transition temperature, the cost is too high to be practically applied

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Catalyst preparation

[0024] 6MHNO in 80°C oil bath 3 Multi-walled carbon nanotubes (commercially available, purity>95%, diameter 40-60nm, length 5-15μm, provided by Shenzhen Nanometer Harbor Co., Ltd.) were oxidized for 2h; then filtered, washed until neutral, and dried at 120°C ; Take the above-mentioned oxidized carbon nanotubes, add 70mL of water, and ultrasonically disperse them; 2 PdC1 4 solution, stirred evenly, added formaldehyde solution, adjusted the pH value to 9 with 1M NaOH solution, stirred for 25 minutes, filtered, washed with a large amount of water, and dried to obtain Pd / multi-walled carbon nanotube catalyst (Pd / MwCNTs).

[0025] Two catalysts were prepared according to the above method: catalyst 1 (4% palladium mass content) and catalyst 2 (7% palladium mass content).

[0026] (2) Hydrodeoxygenation of stearic acid

[0027] Add 2.5 parts (parts by volume, the same below) of stearic acid, 0.3 parts of Pd / MwCNTs catalyst 1 and 20 parts of n-hex...

Embodiment 2

[0039] (1) Catalyst preparation (same as Example 1)

[0040] (2) Hydrogenation of stearic acid.

[0041] Add 2.5 parts (parts by volume, the same below) of single-pressure stearic acid, 0.3 parts of Pd / MwCNTs catalyst 1 and 20 parts of n-hexane into a 100mL reactor, fill it with hydrogen, the initial hydrogen pressure is 2.5MPa, start stirring and heating, 280 After reacting at ℃ for 6 hours, the reaction was stopped. After cooling to room temperature, the catalyst was separated by filtration. Quantitative detection is carried out to product with gas chromatography, it can be known that the conversion rate of raw material single pressure stearic acid is 82%, and the total yield of product octadecane is 76% (molar yield, product n-octadecane accounts for 1% of raw material stearic acid). percentage, the same below).

[0042] (3) Hydrodeoxygenation of palmitic acid.

[0043] Add 2.5 parts (parts by volume, the same below) of n-hexadecanoic acid, 0.3 parts of Pd / MwCNTs catalys...

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Abstract

The invention relates to a phase-change material and a preparation method thereof with natural acid as a raw material. According to the invention, a natural acid raw material and a solvent are mixed and then undergo a hydrogenation reaction in the presence of a catalyst and hydrogen so as to prepare corresponding n-alkanes with an even carbon number and high purity, and the n-alkanes with an even carbon number and a mixture thereof are a high performance phase-change material which is especially applicable to preparation of phase-change material with a temperature of 19 to 26 DEG C at which people feel most comfortable. Compared with the prior art, the invention has the following advantages: the preparation method is simple, and the prepared phase-change material has great latent heat of phase change.

Description

technical field [0001] The invention belongs to the technical field of special waxes, and in particular relates to the preparation of high-performance phase-change materials through proper treatment of natural acids. Background technique [0002] The world's energy supply is dominated by fossil fuels such as oil, natural gas, and coal. With the reduction of these non-renewable resource reserves and the rise in prices, research on various alternative energy sources has been continuously strengthened; and the environmental problems caused by the use of these fossil fuels are becoming more and more serious. Seriously, the utilization of energy saving and solar energy has been widely valued. At the same time, with the development of society, people have higher and higher requirements for living comfort, which requires more energy consumption. [0003] At home and abroad, the research on the use of phase change materials (PCM, PhaseChangeMaterial for short) to store solar energy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06C07C9/22C07C1/22B01J23/44
Inventor 孙剑锋张志银张造根王立言全辉姚春雷赵威林振发高蒿
Owner CHINA PETROLEUM & CHEM CORP
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