Document Detail

Compressibility of Gas Hydrates.
MedLine Citation:
PMID:  21717564     Owner:  NLM     Status:  Publisher    
Experimental data on the pressure dependence of unit cell parameters for the gas hydrates of ethane (cubic structure I, pressure range 0-2 GPa), xenon (cubic structure I, pressure range 0-1.5 GPa) and the double hydrate of tetrahydrofuran+xenon (cubic structure II, pressure range 0-3 GPa) are presented. Approximation of the data using the cubic Birch-Murnaghan equation, P=1.5B(0) [(V(0) /V)(7/3) -(V(0) /V)(5/3) ], gave the following results: for ethane hydrate V(0) =1781 Å(3) , B(0) =11.2 GPa; for xenon hydrate V(0) =1726 Å(3) , B(0) =9.3 GPa; for the double hydrate of tetrahydrofuran+xenon V(0) =5323 Å(3) , B(0) =8.8 GPa. In the last case, the approximation was performed within the pressure range 0-1.5 GPa; it is impossible to describe the results within a broader pressure range using the cubic Birch-Murnaghan equation. At the maximum pressure of the existence of the double hydrate of tetrahydrofuran+xenon (3.1 GPa), the unit cell volume was 86 % of the unit cell volume at zero pressure. Analysis of the experimental data obtained by us and data available from the literature showed that 1) the bulk modulus of gas hydrates with classical polyhedral structures, in most cases, are close to each other and 2) the bulk modulus is mainly determined by the elasticity of the hydrogen-bonded water framework. Variable filling of the cavities with guest molecules also has a substantial effect on the bulk modulus. On the basis of the obtained results, we concluded that the bulk modulus of gas hydrates with classical polyhedral structures and existing at pressures up to 1.5 GPa was equal to (9±2) GPa. In cases when data on the equations of state for the hydrates were unavailable, the indicated values may be recommended as the most probable ones.
Andrey Yu Manakov; Anna Yu Likhacheva; Vladimir A Potemkin; Andrey G Ogienko; Alexander V Kurnosov; Aleksei I Ancharov
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-6-29
Journal Detail:
Title:  Chemphyschem : a European journal of chemical physics and physical chemistry     Volume:  -     ISSN:  1439-7641     ISO Abbreviation:  -     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-6-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100954211     Medline TA:  Chemphyschem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Nikolaev Institute of Inorganic Chemistry SB RAS, Akad. Lavrentiev ave., 3, Novosibirsk, 630090 (Russian Federation), Fax: (+7) 383-330-94 89.
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