Article
Chemistry, Multidisciplinary
Muhammad A. Kamel, Aleksei S. Lobasov, Surya Narayan, Konstantin S. Pervunin, Christos N. Markides
Summary: This study investigates the growth mechanism and process of hydrate formation by observing the process on a water drop immersed in liquid cyclopentane. The study reveals that the morphology of hydrate film changes with the subcooling temperature, and the growth rate of hydrate varies with the degree of subcooling.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Multidisciplinary
Mohsen Abbaspour, Fateme Fotourechi, Hamed Akbarzadeh, Sirous Salemi
Summary: In this study, water molecules in fixed and rigid (15,0) CNTs formed a hexagonal ice nanotube. The addition of methane molecules replaced the hexagonal structure of confined water molecules. When inhibitors were added to methane clathrates in CNT, benzene, [emim(+)][Cl-] IL, methanol, NaCl, and THF were found to have different inhibition behaviors. [emim(+)][Cl-] IL showed the best inhibition effects, while THF and benzene were more effective than NaCl and methanol. The IL and THF inhibitors tended to aggregate, while benzene and IL molecules were distributed along the CNT and affected the behavior of THF as an inhibitor in the CNT. Furthermore, the IL had stronger inhibition effects in the armchair (9,9) and the flexible (15,0) CNTs compared to other systems.
Article
Chemistry, Multidisciplinary
Min-Kyung Kim, Geumbi Han, Hyeonjin Kim, Jihee Yu, Youngki Lee, Taekyong Song, Jinmo Park, Yo-Han Kim, Yun-Ho Ahn
Summary: In this study, superabsorbent polymer (SAP) was used to promote the formation of natural gas hydrates. SAP can efficiently absorb water and improve the kinetics of gas hydrate formation. The promotion effect of SAP is influenced by various factors.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Miguel Pineda, Anh Phan, Carolyn Ann Koh, Alberto Striolo, Michail Stamatakis
Summary: A physical-based computational modeling framework combining the Monte Carlo and cellular automata techniques provides insight into CO2 hydrate crystal growth and morphology. CO2 hydrates are important in a diverse range of applications and technologies in the environmental and energy fields. The development of such technologies relies on fundamental understanding, which necessitates not only experimental but also computational studies of the growth behavior of CO2 hydrates and the factors affecting their crystal morphology.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Energy & Fuels
Namrata Gaikwad, Gaurav Bhattacharjee, Jitendra S. Sangwai, Rajnish Kumar, Praveen Linga
Summary: This study investigates the kinetics and morphology of hydrate crystal growth in gas-water and gas-liquid hydrocarbon-water systems using different additives. The addition of tryptophan significantly enhances gas uptake and hydrate formation rate. In the gas-liquid hydrocarbon-water system, the presence of water-insoluble Cyclo-O hinders mass transfer between gas and bulk water phase, resulting in cloudlike hydrate formation.
Article
Energy & Fuels
Jyoti Shanker Pandey, Orjan Strand, Nicolas von Solms, Stian Almenningen, Geir Ersland
Summary: Currently, there is a lack of visualization studies on fluid migration and hydrate rearrangement during CO2 injection into CH4 hydrates. This experimental study provides the first pore-level visualization of gas-saturated CH4 hydrates when liquid CO2 is injected, revealing the impacts of CO2 injection on the morphology evolution of CH4 hydrates and its importance for improving CH4 gas recovery without losing hydrate mass.
Article
Engineering, Environmental
Parul Sahu
Summary: Clathrate hydrates are gaining attention for their applications in water reclamation, with advancements in forming agents and kinetic promoters playing a key role in accelerating the hydrate formation and water recovery process. Additionally, developments in novel reactor designs, efficient separation methods, and hybrid processes are making clathrate hydrate technology a strong candidate for future water reclamation from waste effluents.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Review
Chemistry, Multidisciplinary
Yuan Liu, Yangyang Pu, Xiao Cheng Zeng
Summary: Scientific research on diverse ice structures has a history of more than a century. So far, 20 three-dimensional crystalline ice phases have been identified in the laboratory, including low-density nanoporous ices. These nanoporous ices can be viewed as a special class of porous materials or water ice, with a relatively high fraction of nano-cavities and/or nano-channels. They have potential applications in gas storage, purification, separation, and biomedical field due to their large surface-to-volume ratio and excellent biocompatibility. Further experimental confirmation and the application of machine learning methods will lead to more reliable porous ice structures and phase diagrams.
Article
Chemistry, Physical
S. Blazquez, M. M. Conde, C. Vega, E. Sanz
Summary: CO2 and CH4 hydrates are important both energetically and environmentally. Molecular dynamics simulations reveal that the growth rate of these hydrates is affected by the incorporation of guest molecules, with CO2 hydrate growing faster due to higher solubility. Additionally, higher temperatures require more molecular motion for solid growth. Our calculations show good agreement with experiments of hydrate growth along the guest-solution interface, but further work is needed to reconcile different experimental results.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Energy & Fuels
Evgeny Chuvilin, Valentina Ekimova, Dinara Davletshina, Ekaterina Krivokhat, Vladimir Shilenkov, Boris Bukhanov
Summary: The development of the Arctic region faces challenges such as methane emission from permafrost. While the effects of temperature and pressure on gas hydrates have been studied, the chemical effects, such as salt migration, remain poorly understood. This study investigates the interaction of frozen hydrate-saturated sediments with NaCl solutions under different gas pressures.
Article
Chemistry, Multidisciplinary
Riku Matsuura, Saman Alavi, Ryo Ohmura
Summary: This study presents visual observations of the formation and growth of structure-H hydrate formed with methane and 1-methylpiperidine (MPD). The crystal growth dynamics were categorized into two types depending on the subcooling temperature, showing changes in crystal shape and size with different subcooling conditions. The implications of crystal morphology on suitable conditions for industrial utilization of this hydrate for gas capture applications are discussed.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Energy & Fuels
Amir Saberi, Abdolmohammad Alamdari, Ali Rasoolzadeh, Amir H. Mohammadi
Summary: This study investigated the impact of three chemicals at different concentrations on gas hydrate formation, and identified the optimal choices. Furthermore, the combination of PVP and MEG in an aqueous solution was found to have a simultaneous synergistic impact on both natural gas hydrate formation induction time and the rate of gas consumption.
Article
Energy & Fuels
M. Fahed Qureshi, Vikas Dhamu, Adam Usadi, Timothy A. Barckholtz, Ashish B. Mhadeshwar, Praveen Linga
Summary: Carbon capture and sequestration is a critical method to reduce carbon footprint and achieve net-zero carbon emissions. This study examines the kinetics of CO2 hydrate formation using liquid CO2 and a green kinetic promoter, and presents a mathematical model for quantifying hydrate formation kinetics. The results show that the green kinetic promoter enhances the overall water to hydrate conversion and reduces the formation process time.
Article
Chemistry, Multidisciplinary
Saphir Venet, Daniel Broseta, Ross Brown
Summary: Video microscopy reveals a novel morphology and growth process of gas hydrate, promoted by a porous activated carbon substrate at a guest-host interface. The growth of hollow cyclopentane hydrate fibers is continuously fed by the flow of the guest through the substrate, even pushing the substrate away from the interface. The growth is limited by the size of the setup, overcoming the gas hydrate mass-transfer bottleneck and forming a thin impervious hydrate crust between the two phases in quiescent systems.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Energy & Fuels
Yingmei Wang, Aili Niu, Wenze Jiao, Ji Chen, Peng Zhang, Jinping Li
Summary: Carbon dioxide hydrate formation rate is improved by using different accelerator systems. The combination of nanographite-TBAB and SDS-TBAB shows better performance in reducing the nucleation time. TBAB shows the best nucleation amount, formation rate, and conversion rate among the single acceleration systems.
