Hydrate phase equilibrium in the system of (carbon dioxide + 2,2-dimethylbutane + water) at temperatures below freezing point of water |
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| Institution: | 1. Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-Ku, Yokohama 223-8522, Japan;2. Division of Applied Physics, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan;1. Australian Centre for Research on Separation Science (ACROSS), School of Physical Sciences-Chemistry, University of Tasmania, Hobart 7001, TAS, Australia;2. Materials Chemistry Research Unit, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand;3. Graduate School of Pharmaceutical Sciences, University of Tokyo, Tokyo, Japan;1. School of Environmental Engineering, Northeast Forestry University, Harbin, Heilongjiang 150040, PR China;2. Engineering Laboratory of Specialty Fibers and Nuclear Energy Materials, Ningbo Institute of Industrial Technology, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, PR China;3. Key Laboratory of Systems Biomedicine(Ministry of Education), Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, PR China |
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| Abstract: | The four-phase equilibrium conditions of (vapor + liquid + hydrate + ice) were measured in the system of (CO2 + 2,2-dimethylbutane + water). The measurements were performed within the temperature range (254.2 to 270.2) K and pressure range (0.490 to 0.847) MPa using an isochoric method. Phase equilibrium conditions of hydrate formed in this study were measured to be at higher temperatures and lower pressures than those of structure I CO2 simple hydrate. The largest difference in the equilibrium pressures of structure I CO2 hydrate and the hydrate formed in the present study was 0.057 MPa at T = 258.3 K. On the basis of the four-phase equilibrium data obtained, the quintuple point for the (ice + structure I hydrate + structure H hydrate + liquid + vapor) was also determined to be T = 266.4 K and 0.864 MPa. The results indicate that structure H hydrate formed with CO2 and 2,2-dimethylbutane is stable exclusively at the temperatures below the quintuple temperature. |
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