• Treffer 3 von 3
Zurück zur Trefferliste

Experimental Studies of the Mechanism and Kinetics of Hydration Reactions

  • The mechanism and the kinetics of hydration reactions are important for the application of a salt hydrate as a thermochemical heat storage material. MgSO4·H2O and Na2SO4 were chosen in this study because they are both promising candidates for such an application. Considering that the hydration of these salts yields MgSO4·7H2O and Na2SO4·10H2O as the reaction products, the maximum overall heatThe mechanism and the kinetics of hydration reactions are important for the application of a salt hydrate as a thermochemical heat storage material. MgSO4·H2O and Na2SO4 were chosen in this study because they are both promising candidates for such an application. Considering that the hydration of these salts yields MgSO4·7H2O and Na2SO4·10H2O as the reaction products, the maximum overall heat effect can be calculated from the heat of condensation of water vapor (44 kJ mol–1) and the heats of hydration of 75 kJ·mol-1 (for MgSO4·H2O) and 81 kJ mol-1 (for Na2SO4). Based on the densities of the two hydrated phases, this results in the very high theoretical energy densities of 2.3 GJ·m-3 and 2.4 GJ·m-3, respectively, for MgSO4·7H2O and Na2SO4·10H2O. Not only the energy density is important for the dimensioning of a storage system, but also the kinetics of hydration reactions play a major role for the application as storage material. In the present study, hydration reactions under varying climatic conditions were investigated by using water vapor sorption measurements and in-situ Raman microscopy. Using the phase diagrams, it can be clearly shown that the mechanism and the kinetics depend on the climatic conditions. Below the deliquescence humidity of the lower hydrated phase the hydration proceeds as solid state reaction, whilst above the deliquescence humidity a through solution mechanism takes place.zeige mehrzeige weniger

Volltext Dateien herunterladen

Metadaten exportieren

Weitere Dienste

Teilen auf Twitter Suche bei Google Scholar
Metadaten
Dokumentart:Artikel (Wissenschaftlicher)
Verfasserangaben: Kirsten Linnow, Michael Niermann, Dennis Bonatz, Konrad Posern, Michael Steiger
DOI (Zitierlink):https://doi.org/10.1016/j.egypro.2014.02.046Zitierlink
URN (Zitierlink):https://nbn-resolving.org/urn:nbn:de:gbv:wim2-20170425-31484Zitierlink
Titel des übergeordneten Werkes (Englisch):Energy Procedia
Sprache:Englisch
Datum der Veröffentlichung (online):25.04.2017
Jahr der Erstveröffentlichung:2014
Datum der Freischaltung:25.04.2017
Veröffentlichende Institution:Bauhaus-Universität Weimar
Institute und Partnereinrichtugen:Fakultät Bauingenieurwesen / Professur Bauchemie und Polymere Werkstoffe
Erste Seite:394
Letzte Seite:404
Freies Schlagwort / Tag:hermochemical heat storage, hydration mechanism, magnesium sulfate; sodium sulfate
GND-Schlagwort:Wärmespeicherung; Hydratation; Magnesiumsulfat; Natriumsulfat
DDC-Klassifikation:500 Naturwissenschaften und Mathematik / 540 Chemie
BKL-Klassifikation:35 Chemie / 35.44 Alkalimetalle, Erdalkalimetalle und ihre Verbindungen
Lizenz (Deutsch):License Logo Creative Commons 4.0 - Namensnennung-Nicht kommerziell-Keine Bearbeitung (CC BY-NC-ND 4.0)