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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甲胺、戊胺和癸胺对二氧化碳封存相关 CO2 水合物形成和解离动力学的影响

从可持续工程的角度来看，天然气水合物一直是研究的核心，考虑到它们在广泛的科学环境中的独特应用。一种这样的应用是将气态CO ₂封存为海床下的固体水合物。海底以下普遍存在低温和高压，使其成为热力学可行的过程。此外，改进的 CO ₂水合物动力学将促进碳捕获、储存和封存的技术发展。本研究的重点是理解 CO ₂与有机脂肪胺，特别是甲胺、戊胺和癸胺的水合物动力学。添加剂以 0.1、1 和 5 wt% 的浓度进行了测试，以仔细了解它们的影响。使用 300 mL 搅拌罐式反应器在 3.5 MPa 和 274.55 K 下用纯水进行研究，这是人们在浅海沉积物中遇到的典型温度和压力条件。所有添加剂在诱导时间方面都表现出相当大的提升，确保更快的 CO ₂水合物成核。此外，与其他两种添加剂相比，在我们的实验中，癸胺导致 CO _{2的吸收更快。}进行了高达 293.15 K 的水合物解离研究，以评估所考虑的添加剂对 CO _2的影响水合物离解。癸胺体系也延缓了气体释放速率，表现出比纯水体系更好的稳定性。该研究还提出了一种合适的井设计，以增强海底 CO ₂固体水合物的封存。