Clathrate hydrate formation in (methane + water + methylcyclohexanone) systems: the first phase equilibrium data |
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Authors: | Ryo Ohmura Tsutomu Uchida Satoshi Takeya Jiro Nagao Hideki Minagawa Takao Ebinuma Hideo Narita |
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Institution: | Institute for Energy Utilization, National Institute of Advanced Industrial Science and Technology (AIST), 2-17-1-2, Tsukisamu-Higashi, Toyohira-ku, Sapporo 062-8517, Japan |
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Abstract: | The present study experimentally demonstrated clathrate hydrate formation in the systems of (methane + water + each of the three methylcyclohexanone isomers, i.e., 2-methylcyclohexanone, 3-methylcyclohexanone, and 4-methylcyclohexanone) and measured the first data of the quadruple (water rich liquid + hydrate + methylcyclohexanone rich liquid + methane rich vapor) equilibrium pressure and temperature conditions in these systems over the temperatures from T=273 K to T=281 K. In the three systems with methylcyclohexanone, the measured equilibrium pressure at each given temperature is ∼1.3 MPa lower than that in a structure-I hydrate forming (methane + water) system without any methylcyclohexanone, which suggests the formation of structure-H hydrates with methylcyclohexanones as large-molecule guest substances. Among the three systems, 3-methylcyclohexanone provides the highest equilibrium pressure, and 2-methylcyclohexanone, the lowest. |
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Keywords: | Clathrate hydrate Gas hydrate Structure-H hydrate Phase equilibria Methylcyclohexanone Methane |
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