Method for increasing heat enthalpy value of sodium sulfate decahydrate

A technology of sodium sulfate decahydrate and sodium sulfate, which is applied in the field of phase change energy storage materials and its preparation, can solve the problems of supercooling, non-uniform melting, phase change enthalpy attenuation, etc., and achieve the effect of high enthalpy value

Inactive Publication Date: 2015-09-30
贵州华益能环保科技有限公司
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Problems solved by technology

Crystalline hydrated salts are the most important type of low-temperature phase-change heat storage materials, but the low-temperature phase-change heat storage materials of crystalline hydrated salts will appear supercooling, non-uniform melting and phase separation, so that heat will not be released when it should be released, and in the system Obvious stratification occurs, and the enthalpy of phase change is greatly attenuated. In order to solve the above problems, many people have proposed various schemes, such as: "A Heat Storage Medium and Its Use", application number 200

Method used

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  • Method for increasing heat enthalpy value of sodium sulfate decahydrate

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[0018] Examples: A method for increasing the enthalpy value of sodium sulfate decahydrate is as follows:

[0019] (1) Take industrial-grade raw material sodium sulfate to prepare a saturated aqueous solution, filter to remove insoluble impurities, and obtain a saturated aqueous solution of sodium sulfate;

[0020] (2) Prepare a saturated aqueous solution with industrial grade manganese nitrate raw materials, filter to remove insoluble impurities, and obtain a saturated aqueous solution of manganese nitrate;

[0021] (3) Mix step (1) 80 ml of saturated aqueous sodium sulfate solution with step (2) 20 ml of saturated aqueous manganese nitrate;

[0022] (4) Slowly add the mixed solution of step (3) to 100ml of absolute ethanol to precipitate a brown-black precipitate, which is filtered and dried at room temperature to obtain 5g of product. The measurement results are as shown in the accompanying drawings;

[0023] (5) Ethanol is recovered under reduced pressure.

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Abstract

The invention discloses a method for increasing the heat enthalpy value of sodium sulfate decahydrate, and belongs to a phase-change heat-storage material and a preparation method thereof. According to the method, nanoscale sodium sulfate decahydrate is wrapped with a nanoscale microcapsule, and a nanoscale phase-change heat-storage microcapsule is produced, so that the phase-change temperature and the heat enthalpy value are changed.

Description

technical field [0001] The invention belongs to the technical field of phase-change energy storage materials and preparation methods thereof, in particular to a method for increasing the enthalpy value of sodium sulfate decahydrate. Background technique [0002] Phase change heat storage or phase change energy storage refers to the phase change latent heat absorbed or released during the process of solidification-melting, solidification-gasification, solidification-sublimation, etc. Phase change heat storage materials are divided into four categories: (1) solid-solid phase change heat storage materials; (2) solid-liquid phase change heat storage materials; (3) liquid-gas phase change heat storage materials; (4) Solid-gas phase change heat storage materials. Among them, (1) solid-solid phase change and (2) solid-liquid phase change heat storage materials are most used. According to different phase change heat storage materials, phase change heat storage materials can be div...

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Application Information

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IPC IPC(8): C09K5/06B01J13/02
Inventor 骆相全
Owner 贵州华益能环保科技有限公司
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