- Titel
- Influence of Sodium Chloride on the Formation and Dissociation Behavior of CO2 Gas Hydrates
- Zitierfähige Url:
- https://nbn-resolving.org/urn:nbn:de:bsz:105-qucosa2-715201
- Quellenangabe
- The Journal of Physical Chemistry B
Erscheinungsort: Washington, DC
Verlag: ACS
Erscheinungsjahr: 2017
Jahrgang: 121
Seiten: 8330-8337 - Erstveröffentlichung
- 2017
- Abstract (EN)
- 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 xH contained 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 microdroplets could be a possible explanation for the so-called memory effect.
- Andere Ausgabe
- Further permissions related to the material excerpted should be directed to the ACS.
Influence of Sodium Chloride on the Formation and Dissociation Behavior of CO2 Gas Hydrates
Link: https://pubs.acs.org/doi/10.1021/acs.jpcb.7b05411
DOI: 10.1021/acs.jpcb.7b05411 - Freie Schlagwörter (DE)
- Hydratbildung, Flüssigkeiten, Solvat, Gele, Wasser
- Freie Schlagwörter (EN)
- hydrate formation, liquids, solvates, gels, water
- Klassifikation (DDC)
- 660
- Normschlagwörter (GND)
- Raman-Spektroskopie
- Gashydrate
- Förder- / Projektangaben
- European Research Council
ERC StG Inhomogeneities
ID: 637654 - Version / Begutachtungsstatus
- publizierte Version / Verlagsversion
- URN Qucosa
- urn:nbn:de:bsz:105-qucosa2-715201
- Veröffentlichungsdatum Qucosa
- 27.07.2020
- Dokumenttyp
- Artikel
- Sprache des Dokumentes
- Englisch
- Lizenz / Rechtehinweis
