Aqueous solution for clathrate hydrate formation, heat-storage agent, process for producing clathrate hydrate or slurry thereof, method for storing/radiating heat, and method for preparing aqueous solution for forming latent-heat-storage agent or major component thereof

Abstract

A heat-storage agent which can store a large quantity of cold heat in the temperature range of 3-15 DEG C, is highly effective in preventing supercooling, and can retain the supercooling-preventing effect even when hydrate solidification / melting is frequently repeated. Also provided are: an aqueous solution which enables the formation of a clathrate hydrate serving as a major component of the heat-storage agent; and a process for producing the clathrate hydrate. The aqueous solution contains at least one of tetra-n-butylammonium bromide and tri-n-butyl-n-pentylammonium bromide as a solute and contains tetraisopentylammonium bromide as a supercooling inhibitor, the weight proportion of the tetraisopentylammonium bromide to the tetra-n-butylammonium bromide and / or tri-n-butyl-n-pentylammonium bromide being in a given range. This aqueous solution is cooled to or below a hydrate formation temperature to thereby produce a clathrate hydrate. The heat-storage agent contains this clathrate hydrate as a major component.

Description

technical field [0001] The present invention relates to heat storage agents for air conditioners such as coolers and heaters and cooling systems for food, and also relates to methods for preparing clathrate hydrates as main components contained in heat storage agents, and the use of In the preparation of the aqueous solution of the clathrate hydrate. [0002] In the present invention, definitions and explanations of terms given below are as follows. The meaning and interpretation of the terms are not intended to exclude the extension of the technical scope of the present invention to the equivalent scope of the present invention. [0003] (1) When multiple molecules combine to form a crystal under appropriate conditions, one molecule (host molecule) forms a cage structure, tubular structure, layer structure or network structure, and other molecules (guest molecules) are inserted into the crystal in the void of the structure. The term "clathrate hydrate" means one of compoun...

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Problems solved by technology

[0027] The method disclosed in Patent Document 5 (which discloses a technique of mixing fine particles into a raw material solution) has a problem that if the fine particles are not uniformly dispersed in the raw material solution, the supercooling suppressing effect does not spread widely in the raw material solution. distribution, so it takes time to achieve this effect; and there is also a problem that fine particles are separated from the raw material solution, so when hydrate production or solidification and melting are repeated, the supercooling suppression effect cannot be obtained

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