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Influence of Sodium Chloride on the Formation and Dissociation Behavior of CO2 Gas Hydrates

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Holzammer,  Christine Carola
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Schicks,  J.
3.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Will,  Stefan
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Braeuer,  Andreas Siegfried
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Zitation

Holzammer, C. C., Schicks, J., Will, S., Braeuer, A. S. (2017): Influence of Sodium Chloride on the Formation and Dissociation Behavior of CO2 Gas Hydrates. - Journal of Physical Chemistry B, 121, 35, 8330-8337.
https://doi.org/10.1021/acs.jpcb.7b05411


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_2498892
Zusammenfassung
We present an experimental study on the formation and dissociation characteristics of carbon dioxide (CO2) gas hydrates using Raman spectroscopy. The CO2 hydrates were formed from sodium-chloride/water solutions with salinities of 0-10 wt-%, which were pressurized with liquid CO2 in a stirred vessel at 6 MPa and a subcooling of 9.5 K. The formation of the CO2 hydrate resulted in a hydrate gel where the solid hydrate can be considered as the continuous phase that includes small amounts of a dispersed liquid water-rich phase that has not been converted to hydrate. During the hydrate formation process we quantified the fraction of solid hydrate xH and the fraction of the dispersed liquid water-rich phase xL from the signature of the hydroxyl (OH)-stretching vibration of the hydrate gel. We found that the fraction of hydrate xHcontained in the hydrate gel linearly depends on the salinity of the initial liquid water-rich phase. In addition the ratio of CO2 and water was analyzed in the liquid water-rich phase before hydrate formation, in the hydrate gel during growth and dissociation and after its complete dissociation again in the liquid water-rich phase. We observed a supersaturation of CO2 in the water-rich phase after complete dissociation of the hydrate gel and were able to show that the excess CO2 exists as dispersed micro- or nanoscale liquid droplets in the liquid water-rich phase. These residual nano- and micro-droplets could be a possible explanation for the so-called memory effect.