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Preparation method for fatty acid ester phase-change energy storage material

A technology of phase-change energy storage materials and fatty acid esters, which is applied in the direction of fatty acid esterification, fatty acid hydrogenation, heat exchange materials, etc., can solve the problems of restricted application and high price, and achieve low cost, low cost and high technology The effect of simple process

Inactive Publication Date: 2014-04-23
NINGBO GREENTECH ENERGY SAVING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current fatty acid esters suitable for PCMs are expensive, which restricts their application in PCMs. Therefore, it is necessary to find an effective method for preparing high-quality fatty acid ester phase change materials at a lower cost

Method used

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  • Preparation method for fatty acid ester phase-change energy storage material
  • Preparation method for fatty acid ester phase-change energy storage material
  • Preparation method for fatty acid ester phase-change energy storage material

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Transesterification reaction: first heat a certain amount of tallow at 100°C for 30 minutes to remove residual moisture, transfer it to a reactor equipped with baffles and stirring, and then add 10 wt% (mass fraction) of sodium propoxide to the propane The sodium alkoxide / propanol mixture is added to tallow, wherein the molar ratio of tallow and propanol is 1:6 for feeding. The reaction mixture was reacted at 85° C. for 45 minutes, and about 10 minutes after the completion of the reaction, the mixture separated into two layers. The light yellow upper layer is tallow propyl ester, while the dark yellow lower layer is glycerin. The obtained tallow propyl ester was purified by washing three times with deionized water, and at the same time, during the first water washing process, several drops of pure hydrochloric acid were added to neutralize the product.

[0036] Hydrogenation reaction: After cleaning and neutralizing the tallow propyl ester, it was added to a borate gla...

Embodiment 2

[0044] Transesterification reaction: first heat a certain amount of tallow at 100°C for 30 minutes to remove residual moisture, transfer it to a reactor equipped with baffles and stirring, then add the mixture of methanol and sodium hydroxide to the tallow , wherein the molar ratio of tallow and methanol is 1:6 for feeding, and sodium hydroxide is 0.5wt% of the tallow mass. The reaction mixture was reacted at 65° C. for 45 minutes, and after about 10 minutes after the completion of the reaction, the mixture separated into two layers. The light yellow upper layer is tallow methyl ester, while the dark yellow lower layer is glycerin. The obtained tallow methyl ester was purified by washing three times with deionized water, and at the same time, during the first washing process, a few drops of pure hydrochloric acid were added to neutralize the product.

[0045] Hydrogenation reaction: After the tallow methyl ester was washed and neutralized, it was added to a borate glass conta...

Embodiment 3

[0048] Transesterification reaction: except catalyst and operating temperature, experimental process is identical with embodiment 1. The catalyst sodium butoxide is prepared by dissolving sodium in butanol to form a butanol mixture containing 10% of the catalyst. Since the boiling point of butanol at standard atmospheric pressure is about 118°C, the reaction temperature was set at 115°C.

[0049] Hydrogenation reaction: Experimental process is identical with embodiment 1.

[0050] Tested by Japan Shimadzu DSC-60 differential scanning calorimeter, all butyl esters are completely converted into saturated esters, the latent heat of phase transition of tallow hydrogenated butyl ester is 124.47J / g, and the melting temperature is 22°C. The test result of this embodiment is as Figure 10 shown.

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Abstract

The invention discloses a preparation method for a fatty acid ester phase-change energy storage material. The preparation method comprises the following operation steps: (1) carrying out an ester exchange reaction: enabling grease containing triglyceride and alcohols to react under the effect of a catalyst to generate a fatty acid ester, wherein the adding mol ratio of the grease to the alcohols is 1 to 6 and the catalyst is metal hydroxide or metal alcoholate; (2) carrying out a hydrogenation reaction: carrying out the hydrogenation reaction on the fatty acid ester to generate a saturated fatty acid ester, wherein the catalyst of the hydrogenation reaction is palladium active carbon; the mass percent of palladium is 4%-6%; the reaction temperature is 55-65 DEG C; the reaction pressure is 0.2-0.3MPa. According to the preparation method, raw materials for preparing the fatty acid ester are renewable and environment-friendly oil and fat and are cheap and easy to obtain. The invention provides an effective method which adopts the current grease as the raw material to prepare the high-quality fatty acid ester phase-change material by using a small cost.

Description

technical field [0001] The invention relates to a phase change energy storage material, in particular to a preparation method of a fatty acid ester phase change energy storage material. Background technique [0002] Phase change materials (Phase Change Materials, PCMs) refer to the process of phase change, which can absorb heat from the environment or release heat to the environment, so as to achieve the purpose of energy storage and release, and solve the problem of energy supply and demand in time and space. mismatched contradictions. Taking advantage of this feature, PCMs have broad application prospects in the fields of solar energy utilization, "peak shifting and valley filling" of electricity, waste heat and waste heat recovery, energy-saving building materials, energy saving of air conditioners, and food preservation. At the same time, because the temperature is approximately constant during the phase transition, it can be used to adjust and control the temperature o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06C11C3/10C11C3/12
Inventor 夏抒穆罕默德·法瑞德
Owner NINGBO GREENTECH ENERGY SAVING TECH
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