Improvement of gas hydrate preservation by increasing compression pressure to simple hydrates of methane, ethane, and propane

In this report, we describe the dissociation behavior of gas hydrate grains pressed at 1 and 6 MPa. Certain simple gas hydrates in powder form show anomalous preservation phenomenon under their thermodynamic unstable condition. Investigation of simple hydrates of methane, ethane, and propane reveals that high pressure applied to the gas hydrate particles enhances their preservation effects. Application of high pressure increases the dissociation temperature of methane hydrate and has a restrictive effect against the dissociation of ethane and propane hydrate grains. These improvements of gas hydrate preservation by increasing pressure to the initial gas hydrate particles imply that appropriate pressure applied to gas hydrate particles enhances gas hydrate preservation effects.

[1]  Guochang Zhang,et al.  Ultra-stability of gas hydrates at 1 atm and 268.2 K , 2008 .

[2]  S. Takeya,et al.  Effect of Long-Term Storage and Thermal History on the Gas Content of Natural Gas Hydrate Pellets under Ambient Pressure , 2015 .

[3]  T. Ebinuma,et al.  In Situ X-ray Diffraction Measurements of the Self-Preservation Effect of CH4 Hydrate , 2001 .

[4]  W. Durham,et al.  Anomalous Preservation of Pure Methane Hydrate at 1 atm , 2001 .

[5]  H. Narita,et al.  Different Modes of Gas Hydrate Dissociation to Ice Observed by Microfocus X-ray Computed Tomography , 2011 .

[6]  W. Kuhs,et al.  "Self-preservation" of CO(2) gas hydrates--surface microstructure and ice perfection. , 2009, The journal of physical chemistry. B.

[7]  R. Ohmura,et al.  Phase Equilibrium for Clathrate Hydrates Formed with Methane, Ethane, Propane, or Carbon Dioxide at Temperatures below the Freezing Point of Water , 2008 .

[8]  E. Sloan,et al.  Phase equilibrium for methane hydrate from 190 to 262 K , 1994 .

[9]  G. D. Holder,et al.  Measurement and prediction of dissociation pressures of isobutane and propane hydrates below the ice point , 1982 .

[10]  Satoshi Takeya,et al.  Dissociation behavior of clathrate hydrates to ice and dependence on guest molecules. , 2008, Angewandte Chemie.

[11]  R. J. Frank,et al.  Hydrates of carbon dioxide and methane mixtures , 1991 .

[12]  T. Ebinuma,et al.  Self-preservation effect and dissociation rates of CH4 hydrate , 2002 .

[13]  W. Durham,et al.  Preservation of methane hydrate at 1 atm , 2001 .

[14]  T. Uchida,et al.  Dissociation termination of methane-ethane hydrates in temperature-ramping tests at atmospheric pressure below the melting point of ice. , 2011, Chemphyschem : a European journal of chemical physics and physical chemistry.

[15]  T. Ebinuma,et al.  Texture change of ice on anomalously preserved methane clathrate hydrate. , 2005, The journal of physical chemistry. B.

[16]  Satoshi Takeya,et al.  Anomalous preservation of CH4 hydrate and its dependence on the morphology of hexagonal ice. , 2010, Chemphyschem : a European journal of chemical physics and physical chemistry.

[17]  Alexei V. Milkov,et al.  Molecular and stable isotope compositions of natural gas hydrates : A revised global dataset and basic interpretations in the context of geological settings , 2005 .

[18]  W. Durham,et al.  Temperature, pressure, and compositional effects on anomalous or , 2003 .

[19]  Yash Paul Handa,et al.  Compositions, enthalpies of dissociation, and heat capacities in the range 85 to 270 K for clathrate hydrates of methane, ethane, and propane, and enthalpy of dissociation of isobutane hydrate, as determined by a heat-flow calorimeter , 1986 .

[20]  H. Narita,et al.  Effective control of gas hydrate dissociation above the melting point of ice. , 2011, Physical Chemistry, Chemical Physics - PCCP.

[21]  S. Takeya,et al.  Natural gas storage and transportation within gas hydrate of smaller particle: Size dependence of self-preservation phenomenon of natural gas hydrate , 2014 .

[22]  E. D. Sloan,et al.  Fundamental principles and applications of natural gas hydrates , 2003, Nature.

[23]  J. Nagao,et al.  Pressurization effects on methane hydrate dissociation , 2013 .

[24]  K. Ueda,et al.  Anomalously Preserved Clathrate Hydrate of Natural Gas in Pellet Form at 253 K , 2012 .

[25]  V. Melnikov,et al.  Evidence of liquid water formation during methane hydrates dissociation below the ice point , 2009 .

[26]  S. Matsuo,et al.  Preservation of CO2 hydrate under different atmospheric conditions , 2016 .

[27]  J. Nagao,et al.  Contribution of water molecules to methane hydrate dissociation , 2015 .

[28]  T. Ebinuma,et al.  Particle size effect of CH4 hydrate for self-preservation , 2005 .

[29]  V. Nakoryakov,et al.  The features of self-preservation for hydrate systems with methane , 2013 .