Phase equilibrium condition measurements in carbon dioxide clathrate hydrate forming system from 199.1 K to 247.1 K

2016 ◽  
Vol 413 ◽  
pp. 53-56 ◽  
Author(s):  
Hironori D. Nagashima ◽  
Naruki Fukushima ◽  
Ryo Ohmura
Keyword(s):  
Carbon Dioxide ◽  
Phase Equilibrium ◽  
Equilibrium Condition ◽  
Clathrate Hydrate ◽  
Phase Equilibrium Condition

Phase equilibrium condition measurements in carbon dioxide hydrate forming system coexisting with seawater

2021 ◽  
Vol 152 ◽  
pp. 106276
Author(s):  
Rihito Nakane ◽  
Yusuke Shimosato ◽  
Eito Gima ◽  
Ryo Ohmura ◽  
Izuru Senaha ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Phase Equilibrium ◽  
Equilibrium Condition ◽  
Carbon Dioxide Hydrate ◽  
Phase Equilibrium Condition

scholarly journals Phase Equilibrium, Thermodynamic Limit, and Melting Temperature in Nanocrystals

2018 ◽  
Vol 63 (11) ◽  
pp. 1036 ◽  
Author(s):  
L. A. Bulavin ◽  
O. M. Alekseev ◽  
Yu. F. Zabashta ◽  
M. M. Lazarenko
Keyword(s):  
Experimental Data ◽  
Phase Equilibrium ◽  
Melting Temperature ◽  
Thermodynamic Limit ◽  
Equilibrium Condition ◽  
Organic Materials ◽  
Porous Solids ◽  
Equilibrium Thermodynamic ◽  
Finite Systems ◽  
Phase Equilibrium Condition

The phase equilibrium condition is shown to be strictly satisfied only in the thermodynamic limit. The notion of melting temperature in the thermodynamic limit is introduced. Formulas are obtained that determine the melting conditions and the melting temperature for finite systems including nanocrystals. The validity of those formulas is confirmed, by comparing them with experimental data for organic materials in porous solids.

scholarly journals Thermodynamic Properties of Hydrogen + Tetra-n-Butyl Ammonium Bromide Semi-Clathrate Hydrate

2010 ◽  
Vol 2010 ◽  
pp. 1-5 ◽  
Author(s):  
Shunsuke Hashimoto ◽  
Takaaki Tsuda ◽  
Kyohei Ogata ◽  
Takeshi Sugahara ◽  
Yoshiro Inoue ◽  
...  
Keyword(s):  
Phase Equilibrium ◽  
Clathrate Hydrate ◽  
Ammonium Bromide ◽  
Mixed Gas ◽  
Raman Spectroscopic ◽  
Hydrogen Molecules ◽  
Three Phase ◽  
Hydrogen Fugacity ◽  
Pressure Swing ◽  
Phase Equilibrium Condition

Thermodynamic stability and hydrogen occupancy on the hydrogen + tetra-n-butyl ammonium bromide semi-clathrate hydrate were investigated by means of Raman spectroscopic and phase equilibrium measurements under the three-phase equilibrium condition. The structure of mixed gas hydrates changes from tetragonal to another structure around 95 MPa and 292 K depending on surrounding hydrogen fugacity. The occupied amount of hydrogen in the semi-clathrate hydrate increases significantly associated with the structural transition. Tetra-n-butyl ammonium bromide semi-clathrate hydrates can absorb hydrogen molecules by a pressure-swing without destroying the hydrogen bonds of hydrate cages at 15 MPa or over.

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