Preparing and decomposing technology for Lewis acid and base adduct saturated solution and application of preparing and decomposing technology

A preparation process and technology for adducts, applied in the engineering field of energy storage and conversion, can solve problems such as increasing decomposition temperature, and achieve the effect of good reversibility and high energy storage density

Inactive Publication Date: 2019-03-15
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Therefore, an increase in the thermal effect of the combinati

Method used

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  • Preparing and decomposing technology for Lewis acid and base adduct saturated solution and application of preparing and decomposing technology
  • Preparing and decomposing technology for Lewis acid and base adduct saturated solution and application of preparing and decomposing technology
  • Preparing and decomposing technology for Lewis acid and base adduct saturated solution and application of preparing and decomposing technology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: with reference to technique described in the present invention, adopt following technical scheme:

[0035] Ammonia is a Lewis base, and HCl contains a Lewis acid, the proton H + , they can react in the gas phase and solution phase at room temperature to form ammonium chloride, while the solid ammonium chloride decomposes significantly above 300°C:

[0036]

[0037] Therefore, NH 4 Cl can be used as a heat storage material above 300°C, and the heat storage energy density is about 3.23kJ / g, which is much higher than that of calcium carbonate. But NH 4 Cl has several fatal disadvantages, that is, the decomposition product NH 3Both HCl and HCl are gases, and phase separation cannot occur automatically. HCl has strong acidity and is severely corrosive to metal equipment, and they are recombined to form NH 4 Cl is a solid, not favorable for NH 4 Cl is returned to the pyrolysis endotherm. For this, we also need to use a solvent like water to help it flow...

Embodiment 2

[0039] Embodiment 2: according to the deficiencies in embodiment 1, by using weak acids, such as carbonic acid, organic carboxylic acids, etc. to reduce acid corrosion, thermal decomposition temperature, etc., also make the energy of the low-temperature heat source be used for heat storage or power generation.

[0040] Using a weak acid—such as carbonic acid and amines to react, the thermal decomposition temperature of the resulting ammonium carbonate or ammonium bicarbonate in aqueous solution is below 100°C, and the heat of reaction is between 60 and 120kJ / mol (calculated according to thermochemical data .For example, NH 4 HCO 3 It is 65kJ / mol or 0.82kJ / g; (NH 4 ) 2 CO 3 is 102kJ / mol or 1.06kJ / g):

[0041]

[0042]

[0043] In the formula, R=H or an organic group. It should be noted that when organic amine carbonate or acid carbonate is thermally decomposed, CO 2 Gases, even organic amine vapors, will promote the flow of the medium, thereby increasing the heat ex...

Embodiment 3

[0044] Embodiment 3: the preparation method of the carbonate or acid carbonate of organic amine:

[0045] 1) Mix the amine with a certain amount of water, and pass CO under stirring 2 gas;

[0046] 2) Detect the pH value of the solution, it can be found that with the CO 2 There are two platforms: the first platform is about pH=10, and the second is about pH=7; when the first platform ends and the pH drops further, that is, all the amines are converted into (organic) ammonium carbonate The moment; when the second plateau ends, it is the sign that amine is all converted into bicarbonate (organic) ammonium.

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Abstract

The invention discloses a preparing and decomposing technology for a Lewis acid and base adduct saturated solution and application of the preparing and decomposing technology. In the preparing technology, Lewis base and Lewis acid serve as raw materials and are sufficiently mixed in a solution or a gas phase, the Lewis acid and base adduct solid is obtained and dissolved in a solvent, and the saturated solution is prepared. In the decomposing technology, the Lewis acid and base adduct saturated solution serves as raw materials, the Lewis acid and base adduct is heated and decomposed at a certain temperature, and the Lewis acid, Lewis base and solvent mixture with the obviously expanded size is generated. The saturated solution absorbs a large amount of heat at the high temperature so as tobe decomposed and is subjected to chemical combination again at the low temperature, corresponding heat is released, and the saturated solution can serve as heat storage materials. Meanwhile, substances generated through decomposition can become phases correspondingly, the inner pressure in the system can be increased in a closed or semi-closed system, and a turbine can be pushed to generate power. Compared with an existing chemical reaction heat storage system, the decomposition temperature is low, and usage is convenient.

Description

technical field [0001] The invention relates to the engineering technical field of energy storage and conversion, in particular to a preparation and decomposition process of a Lewis acid-base adduct saturated solution and its application. Background technique [0002] Energy is the root of all movement. Since the Industrial Revolution, human beings have burned a large amount of fossil energy, resulting in CO in the atmosphere 2 In order to alleviate this problem and to solve the continuously increasing energy demand of human beings, people are developing various sustainable energy sources based on or represented by solar energy. One of them is to increase the temperature of the working medium through light-to-heat conversion, which is then used to heat cooler spaces and substances. In recent years, people are also exploring the use of photothermal-thermal power cogeneration to meet various needs of human beings. [0003] In some practical applications, it is also found th...

Claims

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Application Information

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IPC IPC(8): F28D20/00F03B13/00C09K5/16
CPCC09K5/16F03B13/00F28D20/003F28D2020/0078Y02E60/14
Inventor 雷立旭张书铭
Owner SOUTHEAST UNIV
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