Dissociation of Methane Hydrates in Hollow Silica Matrix with Different Water Ratios
V. Dhanunjana Chari
*
Department of Physics, School of Sciences, Malla Reddy University College, Hyderabad, Telangana, India.
Pinnelli S. R. Prasad
Gas Hydrates Division, National Geophysical Research Institute (CSIR), Hyderabad- Telangana, India.
*Author to whom correspondence should be addressed.
Abstract
Methane hydrate (MH) dissociation, effect of water content and the release rate of methane gas during the process of hydrate dissociation in the presence of fixed amount (10 g) of hollow nano silica grains within diameter range of 30−70μm for different water ratios has been examined in a non-stirred pressure reactor vessel. From the previous reports, the MH’s in spherical silica matrix under optimization of capillary water shows that with silica to water ratio from 1:4 to 1:6 is suitable for methane storage in the hydrate form having higher hydrate (62-58%) and volumetric yields (115-107%) respectively. The gas release during hydrate dissociation depends on the silica to water ratio. The methane gas released during the dissociation (carried out by step heating with ~ 0.03◦/min) is observed to be minimum (~ 0.26 m.mol/min) in water depleted hydrate system and almost same (~ 2 m.mol/min) for pure methane hydrates with saturated and higher water cuts. However, small variations in the final melting point towards thermodynamic promotion of the MH in silica matrix with different silica to water ratios when compared with pure MH were noticed.
Keywords: Handedness, Methane hydrates, Brainedness, hollow silica, Left-Right handedness, water optimization, Genetics of handedness, gas release, Handedness and Cerebral lateralization, hydrate dissociation