Effect of Methylamine, Amylamine, and Decylamine on the Formation and Dissociation Kinetics of CO₂ Hydrate Relevant for Carbon Dioxide Sequestration
2022
Sahu, Chandan | Sircar, Anirbid | Sangwai, Jitendra S. | Kumar, Rajnish
Gas hydrates have been the nucleus of research from a sustainable engineering standpoint, considering their unique applications in a broad spectrum of scientific contexts. One such application is the sequestration of gaseous CO₂ as solid hydrates under the seabed. Low temperature and high pressure are prevalent below the seabed, making it a thermodynamically feasible process. Furthermore, improved CO₂ hydrate kinetics will facilitate technological development for carbon capture, storage, and sequestration. This study focuses on comprehending the CO₂ hydrate kinetics with organic aliphatic amines, particularly methylamine, amylamine, and decylamine. Additives were tested in concentrations of 0.1, 1, and 5 wt % to meticulously comprehend their impact. A 300 mL stirred tank reactor was used for the investigations at 3.5 MPa and 274.55 K with pure water, which are the typical temperature and pressure conditions that one encounters in shallow subsea sediments. All additives showed considerable promotion in induction time, assuring faster CO₂ hydrate nucleation. In addition, decylamine resulted in faster uptake of CO₂ in our experiments compared to the other two additives. Hydrate dissociation studies up to 293.15 K were performed to assess the effect of the considered additives on CO₂ hydrate dissociation. The decylamine system also delayed the gas release rate, showing better stability than the pure water system. This study also proposes a suitable well design for enhanced subsea CO₂ sequestration as solid hydrates.
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