Journal
CHEMICAL ENGINEERING JOURNAL
Volume 363, Issue -, Pages 99-106Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.01.108
Keywords
Gas hydrate; Carbon dioxide; Formation kinetics; Phase equilibria; Desalination
Categories
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2015R1D1A1A02061741]
- POSTECH
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In recent decades, gas hydrates have received significant attention due to their potential roles in energy and environmental applications. The formation of gas hydrates involves a process to assemble variously shaped frameworks made of hydrogen bonded networks of H2O molecules, and thus ionic species, such as Na+, K+, Mg2+, Ca2+, Cl-, SO42-, etc., can be excluded from the solid gas hydrate phase. Therefore, gas hydrates can potentially be utilized in desalination technology. For potential application to a hydrate-based desalination (HBD) process, three cyclic compounds, cyclopentane (CP), cyclopentanone (CP-one), and cyclopentanol (CP-ol), were selected, focusing on a comparison of thermodynamic and kinetic effects. From the thermodynamic view, the study confirmed that the hydrate formation was favorable in the order of CP, CP-one, and CP-ol in the presence of CH4 or CO2. For the kinetic comparison, however, CP-ol and CP-one showed a relatively shorter induction time than CP. The conversion yield of CO2 hydrate of CP-one was more than double those of CP and CP-ol hydrates, which is ascribed to the unique hydration of the ketone during the hydrate formation. The findings suggest that CP-one could be a promising candidate for the HBD process.
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