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

Kathrin Korhammer, J. Mihály, Szabolcs Bálint, László Trif, Ádám Vass, A. Tompos, Emília Tálas

Research output: Contribution to journalArticle

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 languageEnglish
JournalJournal of Thermal Analysis and Calorimetry
DOIs
Publication statusPublished - Jan 1 2019

Fingerprint

heat storage
Heat storage
alcohols
Alcohols
ethyl alcohol
Ethanol
Gas fuel analysis
gas analysis
Spectroscopic analysis
spectroscopic analysis
Calorimetry
Magnesium
Methanol
magnesium
Chlorides
corrosion
heat measurement
methyl alcohol
Salts
recovery

Keywords

  • Alcohol solvates
  • Alkyl chloride formation
  • CaCl
  • Heat storage
  • MgCl

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Cite this

Reversible formation of alcohol solvates and their potential use for heat storage. / Korhammer, Kathrin; Mihály, J.; Bálint, Szabolcs; Trif, László; Vass, Ádám; Tompos, A.; Tálas, Emília.

In: Journal of Thermal Analysis and Calorimetry, 01.01.2019.

Research output: Contribution to journalArticle

Korhammer, Kathrin ; Mihály, J. ; Bálint, Szabolcs ; Trif, László ; Vass, Ádám ; Tompos, A. ; Tálas, Emília. / Reversible formation of alcohol solvates and their potential use for heat storage. In: Journal of Thermal Analysis and Calorimetry. 2019.
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