Kinetic and thermodynamic behaviour of CF4 clathrate hydrates |
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| Institution: | 1. Thermodynamics Research Unit, School of Engineering, University of KwaZulu-Natal, Howard College Campus, King George V Avenue, Durban 4041, South Africa;2. Institut de Recherche en Génie Chimique et Pétrolier (IRGCP), Paris Cedex, France;1. Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230027, China;2. Hefei General Machinery Research Institute, Hefei 230088, China;1. Chemical Engineering Department, Faculty of Chemical Engineering, Tarbiat Modares University, Tehran, Iran;2. Thermodynamics Research Unit, School of Engineering, University of KwaZulu-Natal, Howard College Campus, King George V, Avenue, Durban, South Africa;3. Institut de Recherche en Génie Chimiqueet Pétrolier (IRGCP), Paris Cedex, France;4. Département de Génie des Mines, de la Métallurgie et des Matériaux, Faculté des Sciences et de Génie, Université Laval, Québec (QC) G1V 0A6, Canada;1. Liaoning Provincial Key Laboratory of Chemical Separation Technology, Shenyang University of Chemical Technology, Shenyang 110142, China;2. Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;1. Faculty of Engineering, University of Bojnord, Bojnord, Iran;2. Department of Chemical Engineering, Tarbiat Modares University, Tehran, Iran;3. Institut de Recherche en Génie Chimique et Pétrolier (IRGCP), Paris Cedex, France;4. Thermodynamics Research Unit, School of Engineering, University of KwaZulu-Natal, Howard College Campus, King George V Avenue, Durban 4041, South Africa |
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| Abstract: | This study presents experimental kinetic and thermodynamic data for CF4 clathrate hydrates. Experimental measurements were undertaken in a high pressure equilibrium cell with a 40 cm3 inner volume. The measurements of experimental hydrate dissociation conditions were performed in the temperature range of (273.8 to 278.3) K and pressures ranging from (4.55 to 11.57) MPa. A thermodynamic model based on van der Waals and Platteeuw (vdW–P) solid solution theory was used for prediction and comparison of hydrate dissociation conditions and the Langmuir constant parameters for CF4 based on Parrish and Prausnitz equation are reported. For the kinetics, the effect of initial pressure and temperature on the induction time, CF4 hydrate formation rate, the apparent rate constant of reaction, storage capacity, and water to hydrate conversion during the hydrate formation were studied. Kinetic experiments were performed at initial temperatures of (275.3, 276.1 and 276.6) K and initial pressures of (7.08, 7.92, 9.11, 11.47 and 11.83) MPa. Results show that increasing the initial pressure at constant temperature decreases the induction time, while CF4 hydrate formation rate, the apparent rate constant of reaction, storage capacity, and water to hydrate conversion increase. The same trends are observed with a decrease in the initial temperature at constant pressure. |
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| Keywords: | Gas hydrate Dissociation conditions Kinetics Storage capacity Thermodynamics |
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