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^*

^*Corresponding author for this work

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

4 Citations (Scopus)

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.

Original language	English
Journal	Journal of Thermal Analysis and Calorimetry
Volume	138
Issue number	1
Pages (from-to)	11-33
Number of pages	23
ISSN	1388-6150
DOIs	https://doi.org/10.1007/s10973-019-08090-2
Publication status	Published - 01.10.2019

Bibliographical note

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

Research areas and keywords

Alcohol solvates
Alkyl chloride formation
CaCl
Heat storage
MgCl
Energy research
Chemistry

ASJC Scopus Subject Areas

Physical and Theoretical Chemistry
Condensed Matter Physics

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title = "Reversible formation of alcohol solvates and their potential use for heat storage",

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. ",

keywords = "Alcohol solvates, Alkyl chloride formation, CaCl, Heat storage, MgCl, Energy research, Chemistry",

author = "Kathrin Korhammer and Judith Mih{\'a}ly and Szabolcs B{\'a}lint and L{\'a}szl{\'o} Trif and {\'A}d{\'a}m Vass and Andr{\'a}s Tompos and Em{\'i}lia T{\'a}las",

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T1 - Reversible formation of alcohol solvates and their potential use for heat storage

AU - Korhammer, Kathrin

AU - Mihály, Judith

AU - Bálint, Szabolcs

AU - Trif, László

AU - Vass, Ádám

AU - Tompos, András

AU - Tálas, Emília

PY - 2019/10/1

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N2 - 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.

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.

KW - Alcohol solvates

KW - Alkyl chloride formation

KW - CaCl

KW - Heat storage

KW - MgCl

KW - Energy research

KW - Chemistry

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

Abstract

Bibliographical note

Research areas and keywords

ASJC Scopus Subject Areas

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