DISSOCIATION STUDIES OF CH4-C2H6 AND CH4-CO2 BINARY GAS HYDRATES

L.J. ROVETTO; K.E. BOWLER; L.L. STADTERMAN; C.A. KOH; E.D. SLOAN JR

Hersonissos, Creta, Grecia.

Conferencia; 11th International Conference on Properties and Phase Equilibria for Products and Process Design; 2007

The objective of this work was to enhance the understanding on gas hydrate dissociation, and provide information to help evaluate gas hydrates processes, such as ocean CO2 sequestration and CH4 recovery from natural gas hydrates in deep-sea sediments. The composition and dissociation behavior of CH4+C2H6 and CH4+CO2 structure I binary gas hydrates were determined using NMR spectral analysis. Single-pulse excitation was used in combination with magic angle spinning (MAS). Time-resolved decomposition experiments were carried out on sealed, pressurized samples of both binary gas hydrate systems. Decomposition profiles have been obtained for each case. The observed decomposition rate was, for both systems, directly proportional to the hydrate composition. Under the experimental conditions of this work, the unit cell of sI binary CH4+C2H6 and CH4+CO2 gas hydrate unit cell decomposes as a single entity.