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

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

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Holzammer, Christine Carola1, Author
Schicks, J.2, Author              
Will, Stefan1, Author
Braeuer, Andreas Siegfried1, Author
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1External Organizations, ou_persistent22              
23.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146040              

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 Abstract: 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.

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 Dates: 2017
 Publication Status: Finally published
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Title: Journal of Physical Chemistry B
Source Genre: Journal, SCI, Scopus
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Pages: - Volume / Issue: 121 (35) Sequence Number: - Start / End Page: 8330 - 8337 Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals295