Abstract
Sequestration of carbon dioxide (CO2) in the form of its hydrates in natural methane (CH4) hydrate reservoirs, via CO2/CH4 exchange, is an attractive pathway that also yields valuable CH4 gas as product. In this paper, we describe a macroscale experiment to form CO2 and CH4-CO2 hydrates, under seafloor-mimic conditions, in a vessel fitted with glass windows that provides visualization of hydrates throughout formation and dissociation processes. Time resolved pressure and temperature data as well as images of hydrates are presented. Quantitative gas conversions with pure CO2, calculated from gas chromatographic measurements yielded values that range from 23 – 59% that correspond to the extent of formed hydrates. In CH4-rich CH4-CO2 mixed gas systems, CH4 hydrates were found to form preferentially.
Highlights
Much attention has been paid to sequestration of CO2 in saline aquifers, coal beds, and abandoned petroleum reservoirs as a way to curb atmospheric greenhouse effects [1,2,3,4,5]
This study focused on the formation of gas hydrates on macroscale, from pure CO2 and mixed gases (CO2-CH4 mixture) in the presence of sodium dodecyl sulfate (SDS), a commonly used hydrate former
A facile formation of CO2 hydrates was observed at high pressures and temperatures above freezing in a system in which water was in excess
Summary
Much attention has been paid to sequestration of CO2 in saline aquifers, coal beds, and abandoned petroleum reservoirs as a way to curb atmospheric greenhouse effects [1,2,3,4,5]. CO2 molecules prefer the larger 51262 cages while CH4 molecules fit in the smaller 512 cages This way, when CO2 is introduced into the CH4 hydrate zone, not all of the CH4 dissociates from its parent hydrate. This study focused on the formation of gas hydrates on macroscale, from pure CO2 and mixed gases (CO2-CH4 mixture) in the presence of sodium dodecyl sulfate (SDS), a commonly used hydrate former. Since the pressure vessel in the experimental unit used was fitted with glass windows along the length, time resolved images complemented this study. Such data would be a useful addition to the CO2/CH4 exchange data already known in literature
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