Abstract
Hydrate formation and dissociation processes were carried out in the presence of a pure quartz porous medium impregnated with a metallic powder made with a CuSn12 alloy. Experiments were firstly made in the absence of that powder; then, different concentrations were added to the porous medium: 4.23 wt.%, 18.01 wt.%, and 30.66 wt.%. Then, the hydrate dissociation values were compared with those present in the literature. The porous medium was found to act as an inhibitor in the presence of carbon dioxide, while it did not alter methane hydrate, whose formation proceeded similarly to the ideal trend. The addition of CuSn12 promoted the process significantly. In particular, in concentrations of up to 18.01 wt.%, CO2 hydrate formed at milder conditions until it moved below the ideal equilibrium curve. For methane, the addition of 30.66 wt.% of powder significantly reduced the pressure required to form hydrate, but in every case, dissociation values remained below the ideal equilibrium curve.
Highlights
Natural gas hydrate (NGH) is an ice-like solid compound composed by a crystalline structure based on water molecules, which contains natural gas molecules [1]
This section has been divided into three parts: firstly, methane hydrate formation tests are described and represented in pressure–temperature diagrams; a similar section is dedicated to tests involving carbon dioxide
The present work allowed us to investigate methane and carbon dioxide hydrate formation in the presence of a porous pure quartz medium and a powder consisting of a CuSn12 metallic alloy
Summary
Natural gas hydrate (NGH) is an ice-like solid compound composed by a crystalline structure based on water molecules, which contains natural gas molecules [1]. In the mid-1960s, scientific interest on gas hydrate rose due to the possibility of making it a new potential energy source. Just in this period, the first natural reservoirs were discovered and the first estimations about the amount of natural gas contained in those deposits were made. The first natural reservoirs were discovered and the first estimations about the amount of natural gas contained in those deposits were made To date, these estimates still show some differences between them, but in all cases, the quantity of natural gas present in hydrate was found to be enough to produce more than twice the energy that can still be produced from all conventional energy sources put together [2,3]. The most significant sites were found in the South China
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