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Reversible formation of alcohol solvates and their potential use for heat storage

Research output: Journal contributions › Journal articles › Research › peer-review

Authors

  • Kathrin Korhammer
  • Judith Mihály
  • Szabolcs Bálint
  • László Trif
  • Ádám Vass
  • András Tompos
  • Emília Tálas

In this study, CaCl 2 - and MgCl 2 –alcohol solvates of different stoichiometric quantities of ethyl alcohol (EtOH) and methyl alcohol (MeOH) were synthesized and characterized via coupled thermogravimetric–differential scanning calorimetry, thermogravimetric–mass spectrometric evolved gas analysis (TG-MS), spectroscopic analysis (Raman) methods as well as by X-ray diffraction. Correlations between the obtained calorimetric, thermodynamic, kinetic, and crystallographic data were carried out. The CaCl 2 –alcohol systems seem suitable for heat storage based on the feasible recovery of the salt. However, Raman spectroscopic results revealed that the MgCl 2 –EtOH solvates were instable compounds. Irreversible transformation of MgCl 2 –alcohol solvates related to the formation of alkyl chloride appeared upon heating, as proven by TG-MS and Raman spectroscopic measurements. Pure salt–alcohol solvates could not be prepared under technically applicable conditions. The samples contained at least traces of water. Appearance of side reactions resulting in magnesium oxychlorides, oxyhydroxides, and possible release of HCl with cycling may contribute to corrosion of reactor components. Based on these considerations, MgCl 2 –alcohol solvate systems are not recommended for heat storage.

Original languageEnglish
JournalJournal of Thermal Analysis and Calorimetry
Volume138
Issue number1
Pages (from-to)11-33
Number of pages23
ISSN1388-6150
DOIs
Publication statusPublished - 01.10.2019

Bibliographical note

Publisher Copyright:
© 2019, The Author(s).

Other publications by the same author(s)

Solid Sorption Refrigeration With Calcium Chloride Methanolates on Technical Scale

Neumann, K., Wiegand, M., Opel, O. & Korhammer, K., 04.02.2021, Proceedings of the 14th International Renewable Energy Storage Conference 2020 (IRES 2020). Stadler, I., Droege, P. & Trimborn, C. (eds.). Atlantis Press, p. 142-149 8 p. (Atlantis Highlights in Engineering; vol. 6).

Research output: Contributions to collected editions/works › Article in conference proceedings › Research

Thermodynamic and kinetic study of CaCl2-CH3OH adducts for solid sorption refrigeration by TGA/DSC

Korhammer, K., Neumann, K., Opel, O. & Ruck, W. K. L., 15.11.2018, In: Applied Energy. 230, p. 1255-1278 24 p.

Research output: Journal contributions › Journal articles › Research › peer-review

Micro-scale Thermodynamic and Kinetic Analysis of a Calcium Chloride Methanol System for Process Cooling

Korhammer, K., Neumann, K., Opel, O. & Ruck, W. K. L., 01.05.2017, In: Energy Procedia. 105, p. 4363-4369 7 p.

Research output: Journal contributions › Journal articles › Research › peer-review

Reaction of Calcium Chloride and Magnesium Chloride and their Mixed Salts with Ethanol for Thermal Energy Storage

Korhammer, K., Apel, C., Osterland, T. & Ruck, W. K. L., 01.06.2016, In: Energy Procedia. 91, p. 161-171 11 p., 125043.

Research output: Journal contributions › Conference article in journal › Research › peer-review

Sorption and thermal characterization of composite materials based on chlorides for thermal energy storage

Korhammer, K., Druske, M-M., Fopah Lele, A., Rammelberg, H., Wegscheider, N., Opel, O., Osterland, T. & Ruck, W., 15.01.2016, In: Applied Energy. 162, p. 1462-1472 11 p.

Research output: Journal contributions › Journal articles › Research › peer-review

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