Isothermal phase equilibria for the (xenon + cyclopropane) mixed-gas hydrate system |
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| Affiliation: | 1. Division of Chemical Engineering, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan;2. National Institute of Advanced Industrial Science and Technology, 4-2-1 Nigatake, Miyagino, Sendai, Miyagi 983-8551, Japan;1. College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen, 518060, China;2. Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics, Wuhan University of Technology, Wuhan, 430070, China;1. Key Laboratory of Gas Hydrate, Chinese Academy of Sciences, Guangzhou 510640, China;2. Guangdong Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China;3. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;1. Key Laboratory of TCM Quality Control Technology, Shandong Analysis and Test Center, Shandong Academy of Sciences, 19 Keyuan Street, Jinan, Shandong 250014, China;2. College of Pharmacy, Shandong University of Traditional Chinese Medicine, 4655 Daxue Street, Jinan, Shandong 250355, China |
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| Abstract: | Isothermal three-phase equilibria of gas, aqueous, and hydrate phases for the {xenon (Xe) + cyclopropane (c-C3H6)} mixed-gas hydrate system were measured at two different temperatures (279.15 and 289.15) K. The structural phase transitions from structure-I to structure-II and back to structure-I, depending on the mole fraction of guest mixtures, occur in the (Xe + c-C3H6) mixed-gas hydrate system. The isothermal pressure–composition relations have two local pressure minima. The most important characteristic in the (Xe + c-C3H6) mixed-gas hydrate system is that the equilibrium pressure–composition relations exhibit the complex phase behavior involving two structural phase transitions and two homogeneous negative azeotropes. One of two structural phase transitions exhibits the heterogeneous azeotropic-like behavior. |
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