Phase equilibrium measurements and crystallographic analyses on structure-H type gas hydrate formed from the CH4-CO2-neohexane-water system

The Journal of Physical Chemistry. B
Tsutomu UchidaAkira Hori

Abstract

Phase equilibrium conditions and the crystallographic properties of structure-H type gas hydrates containing various amounts of methane (CH4), carbon dioxide (CO2), neohexane (2,2-dimethylbutane; NH), and liquid water were investigated. When the CH4 concentration was as high as approximately 70%, the phase equilibrium pressure of the structure-H hydrate, which included NH, was about 1 MPa lower at a given temperature than that of the structure-I hydrate with the same composition (except for a lack of NH). However, as the CO2 concentration increased, the pressure difference between the structures became smaller and, at CO2 concentrations below 50%, the phase equilibrium line for the structure-H hydrate crossed that for the structure I. This cross point occurred at a lower temperature at higher CO2 concentration. Extrapolating this relation between the cross point and the CO2 concentration to 100% CO2 suggests that the cross-point temperature would be far below 273.2 K. It is then difficult to form structure-H hydrates in the CO2-NH-liquid water system. To examine the structure, guest composition, and formation process of structure-H hydrates at various CH4-CO2 compositions, we used the methods of Raman spectroscopy, X-ray diffra...Continue Reading

References

May 11, 2005·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Tsutomu UchidaBruce A Buffett

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Citations

Nov 19, 2011·Analytical and Bioanalytical Chemistry·Florian Rauh, Boris Mizaikoff
Oct 16, 2012·The Journal of Chemical Physics·Masaki HiratsukaKenji Yasuoka
Aug 19, 2010·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Hiroshi OhnoJiro Nagao
Mar 10, 2011·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Yun-Je LeeJi-Ho Yoon
Dec 4, 2012·Chemical Communications : Chem Comm·Kyoichi TezukaRyo Ohmura
Dec 3, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Shaden M DaghashAlejandro D Rey
Jun 30, 2006·The Journal of Physical Chemistry. B·Satoshi TakeyaRyo Ohmura

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