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Measurements of the Dissociation Heats of Tetrabutylammonium Acetate and Tetrabutylammonium Hydroxide Ionic Semiclathrate Hydrates

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Abstract

Ionic semiclathrate hydrates mainly consist of water typically together with tetrabutylammonium and tetrabutylphosphonium salts. Since ionic semiclathrate hydrates have the large dissociation heat under ambient pressure and temperature conditions, various ionic semiclathrate hydrates have been studied as safety and eco-friendly phase change materials. In this study, tetrabutylammonium acetate hydrates and tetrabutylammonium hydroxide hydrates were proposed as thermal energy storage media for air conditioning and cooling lithium-ion batteries. The dissociation heat, which was a significant thermophysical property to design thermal energy storage systems, were measured at various mass fractions. The largest dissociation heats of tetrabutylammonium acetate hydrates and tetrabutylammonium hydroxide hydrates were 212.9 ± 0.9 kJ⋅kg−1 and 200.4 ± 2.2 kJ⋅kg−1. As a result of the comparison of the dissociation heats of tetrabutylammonium acetate hydrates and tetrabutylammonium hydroxide hydrates with those of other ionic semiclathrate hydrates, it was found that tetrabutylammonium acetate hydrates and tetrabutylammonium hydroxide hydrates had the promising thermophysical properties as thermal energy storage media for air conditioning and cooling lithium-ion batteries, respectively.

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Data Availability

All datasets presented in this study are included in the article/supplementary files.

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Acknowledgments

The authors gratefully acknowledge the Ohmura Laboratory members for valuable discussion and support.

Funding

This study was supported by a Keirin-racing-based research-promotion fund from the JKA Foundation (2022M-270).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-Ku, Yokohama, Kanagawa, 223-8522, Japan

    Taro Iwai, Shuhei Takamura, Atsushi Hotta & Ryo Ohmura

Authors
  1. Taro Iwai
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  2. Shuhei Takamura
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  3. Atsushi Hotta
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  4. Ryo Ohmura
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Contributions

Conceptualization was contributed by TI, RO; methodology was contributed by TI, ST; formal analysis and investigation were contributed by TI, ST, RO; writing—original draft preparation, was contributed by TI; writing—review and editing, was contributed by RO; funding acquisition was contributed by RO; Resources were contributed by AH, RO; supervision was contributed by RO.

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Correspondence to Ryo Ohmura.

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Iwai, T., Takamura, S., Hotta, A. et al. Measurements of the Dissociation Heats of Tetrabutylammonium Acetate and Tetrabutylammonium Hydroxide Ionic Semiclathrate Hydrates. Int J Thermophys 44, 42 (2023). https://doi.org/10.1007/s10765-022-03150-6

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