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

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

doi:10.1007/s10973-019-08090-2

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

Kathrin Korhammer
, Judith Mihály
, Szabolcs Bálint
, László Trif
, Ádám Vass
, András Tompos
, Emília Tálas^*

^*Korrespondierende/r Autor/-in für diese Arbeit

Publikation: Beiträge in Zeitschriften › Zeitschriftenaufsätze › Forschung › Begutachtung

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Abstract

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.

Originalsprache	Englisch
Zeitschrift	Journal of Thermal Analysis and Calorimetry
Jahrgang	138
Ausgabenummer	1
Seiten (von - bis)	11-33
Seitenumfang	23
ISSN	1388-6150
DOIs	https://doi.org/10.1007/s10973-019-08090-2
Publikationsstatus	Erschienen - 01.10.2019

Bibliographische Notiz

Funding Information:
Open access funding provided by MTA Research Centre for Natural Sciences (MTA TTK). Project no. TÉT_12_DE-1-2013-0003 has been implemented with the support provided by the National Research, Development and Innovation Fund of Hungary, financed under the TÉT_12_DE funding scheme. This study received funding from the German Federal Ministry of Education and Research (BMBF) within the framework of a bilateral research collaborative project between the Leuphana University of Lüneburg and the Hungarian Academy of Sciences under grant agreement number 01DS14029. The authors thank Christina Apel for the preparation of salt–alcohol solvate samples.

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

Fachgebiete und Schlagwörter

Energieforschung
Chemie

ASJC Scopus Sachgebiete

Physikalische und Theoretische Chemie
Physik der kondensierten Materie

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abstract = " 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. ",

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AU - Vass, Ádám

AU - Tompos, András

AU - Tálas, Emília

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AB - 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.

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

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