Phase Equilibrium of CO<sub>2</sub> Hydrate with Rubidium Chloride Aqueous Solution
Salt lakes are a rich source of metals used in various fields. Rubidium is found in small amounts in salt lakes, but extraction technology on an industrial scale has not been developed completely. Clathrate hydrates are crystalline compounds formed by the encapsulation of guest molecules in cage-lik...
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2025-01-01
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| author | Ryonosuke Kasai Leo Kamiya Ryo Ohmura |
| author_facet | Ryonosuke Kasai Leo Kamiya Ryo Ohmura |
| author_sort | Ryonosuke Kasai |
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| description | Salt lakes are a rich source of metals used in various fields. Rubidium is found in small amounts in salt lakes, but extraction technology on an industrial scale has not been developed completely. Clathrate hydrates are crystalline compounds formed by the encapsulation of guest molecules in cage-like structures made of water molecules. One of the most important properties for engineering practices of hydrate-based technologies is the comprehension of the phase equilibrium conditions. Phase equilibrium conditions of CO<sub>2</sub> hydrate in rubidium chloride aqueous solution with mass fractions of 0.05, 0.10, 0.15 and 0.20 were experimentally investigated in the pressure range from 1.27 MPa to 3.53 MPa, and the temperature was from 268.7 K to 280.6 K. The measured equilibrium temperature in this study decreased roughly in proportion to the concentration of the RbCl solution from the pure water system. This depression is due to the lowering of the chemical potential of water in the liquid phase by the dissolution of RbCl. Experimental results compared with other salt solution + CO<sub>2</sub> hydrate systems showed that the equilibrium temperatures decreased to a similar degree for similar mole fractions. |
| format | Article |
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| institution | Kabale University |
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| publishDate | 2025-01-01 |
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| spelling | doaj-art-de20f91002b34a0b988d51827478e6362025-01-24T13:49:31ZengMDPI AGSeparations2297-87392025-01-011211310.3390/separations12010013Phase Equilibrium of CO<sub>2</sub> Hydrate with Rubidium Chloride Aqueous SolutionRyonosuke Kasai0Leo Kamiya1Ryo Ohmura2Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, JapanDepartment of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, JapanDepartment of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, JapanSalt lakes are a rich source of metals used in various fields. Rubidium is found in small amounts in salt lakes, but extraction technology on an industrial scale has not been developed completely. Clathrate hydrates are crystalline compounds formed by the encapsulation of guest molecules in cage-like structures made of water molecules. One of the most important properties for engineering practices of hydrate-based technologies is the comprehension of the phase equilibrium conditions. Phase equilibrium conditions of CO<sub>2</sub> hydrate in rubidium chloride aqueous solution with mass fractions of 0.05, 0.10, 0.15 and 0.20 were experimentally investigated in the pressure range from 1.27 MPa to 3.53 MPa, and the temperature was from 268.7 K to 280.6 K. The measured equilibrium temperature in this study decreased roughly in proportion to the concentration of the RbCl solution from the pure water system. This depression is due to the lowering of the chemical potential of water in the liquid phase by the dissolution of RbCl. Experimental results compared with other salt solution + CO<sub>2</sub> hydrate systems showed that the equilibrium temperatures decreased to a similar degree for similar mole fractions.https://www.mdpi.com/2297-8739/12/1/13clathrate hydratesalt lakeCO<sub>2</sub> hydraterubidiumphase equilibrium |
| spellingShingle | Ryonosuke Kasai Leo Kamiya Ryo Ohmura Phase Equilibrium of CO<sub>2</sub> Hydrate with Rubidium Chloride Aqueous Solution Separations clathrate hydrate salt lake CO<sub>2</sub> hydrate rubidium phase equilibrium |
| title | Phase Equilibrium of CO<sub>2</sub> Hydrate with Rubidium Chloride Aqueous Solution |
| title_full | Phase Equilibrium of CO<sub>2</sub> Hydrate with Rubidium Chloride Aqueous Solution |
| title_fullStr | Phase Equilibrium of CO<sub>2</sub> Hydrate with Rubidium Chloride Aqueous Solution |
| title_full_unstemmed | Phase Equilibrium of CO<sub>2</sub> Hydrate with Rubidium Chloride Aqueous Solution |
| title_short | Phase Equilibrium of CO<sub>2</sub> Hydrate with Rubidium Chloride Aqueous Solution |
| title_sort | phase equilibrium of co sub 2 sub hydrate with rubidium chloride aqueous solution |
| topic | clathrate hydrate salt lake CO<sub>2</sub> hydrate rubidium phase equilibrium |
| url | https://www.mdpi.com/2297-8739/12/1/13 |
| work_keys_str_mv | AT ryonosukekasai phaseequilibriumofcosub2subhydratewithrubidiumchlorideaqueoussolution AT leokamiya phaseequilibriumofcosub2subhydratewithrubidiumchlorideaqueoussolution AT ryoohmura phaseequilibriumofcosub2subhydratewithrubidiumchlorideaqueoussolution |