FORMATION AND DISSOCIATION OF CO2 AND CO2 – THF HYDRATES COMPARED TO CH4 AND CH4 - THF HYDRATES ...

• Main Authors: Giavarini, Carlo, Maccioni, Filippo, Broggi, Alessandra, Politi, Monia
• Format: Text
• Language: English
• Published: The University of British Columbia 2008
• Subjects: Methane hydrate
• Online Access: https://dx.doi.org/10.14288/1.0041112; https://doi.library.ubc.ca/10.14288/1.0041112

This work is part of a research project sponsored by the Italian Electricity Agency for CO2 disposal in form of hydrate. The dissociation behavior of CH4 hydrate was taken as a reference for the study of the CO2 hydrate preservation. The formation and dissociation of CO2 and CO2–THF mixed hydrates, compared to CH4 and CH4 – THF mixed hydrates, has been considered. The experimental tests were performed in a 2 liter reaction calorimeter at pressures between 0.1 and 0.3 MPa. The dissociation has been followed at temperatures from -3 °C to 0 °C for CO2 and CH4 hydrates, and from -3 °C to 10 °C for THF mixed hydrates. More than pressure, which is very important for methane hydrates, temperature affects the preservation of CO2 and CO2–THF mixed hydrates. Subcooling after formation is important for methane hydrate preservation, but it does not substantially affect CO2 hydrate stability. In the studied P, T range, CO2 hydrate does not present any anomalous self-preservation effect. The mixtures containing more ice ...