How Sodium Chloride Salt Inhibits the Formation of CO2 Gas Hydrates.

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Details zur Publikation

Autor(en): Holzammer C, Finckenstein A, Will S, Bräuer A
Zeitschrift: Journal of Physical Chemistry B
Jahr der Veröffentlichung: 2016
Band: 120
Heftnummer: 9
Seitenbereich: 2452-9
ISSN: 1520-6106
eISSN: 1520-5207
Sprache: Englisch


Abstract


We present an experimental Raman study on how the addition of sodium chloride to CO2-hydrate-forming systems inhibits the hydrate formation thermodynamically. For this purpose, the molar enthalpy of reaction and the molar entropy of reaction for the reaction of weakly hydrogen-bonded water molecules to strongly hydrogen bonded water molecules are determined for different salinities from the Raman spectrum of the water-stretching vibration. Simultaneously, the influence of the salinity on the solubility of CO2 in the liquid water-rich phase right before the start of hydrate formation is analyzed. The results demonstrate that various mechanisms contribute to the inhibition of gas hydrate formation. For the highest salt concentration of 20 wt % investigated, the temperature of gas hydrate formation is lowered by 12 K. For this concentration the molar enthalpy and entropy of reaction become smaller by 50 and 20%, respectively. Concurrently, the solubility of carbon dioxide is reduced by 70%. These results are compared with data in literature for systems of sodium chloride in water (without carbon dioxide).



FAU-Autoren / FAU-Herausgeber

Bräuer, Andreas PD Dr.
Erlangen Graduate School in Advanced Optical Technologies
Holzammer, Christine
Erlangen Graduate School in Advanced Optical Technologies
Will, Stefan Prof. Dr.-Ing.
Lehrstuhl für Technische Thermodynamik


Zitierweisen

APA:
Holzammer, C., Finckenstein, A., Will, S., & Bräuer, A. (2016). How Sodium Chloride Salt Inhibits the Formation of CO2 Gas Hydrates. Journal of Physical Chemistry B, 120(9), 2452-9. https://dx.doi.org/10.1021/acs.jpcb.5b12487

MLA:
Holzammer, Christine, et al. "How Sodium Chloride Salt Inhibits the Formation of CO2 Gas Hydrates." Journal of Physical Chemistry B 120.9 (2016): 2452-9.

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Zuletzt aktualisiert 2019-04-06 um 15:23