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Hydration number and two‐phase equilibria of CH 4 hydrate in the deep ocean sediments
Author(s) -
Seo Yongwon,
Lee Huen,
Ryu ByongJae
Publication year - 2002
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2001gl014226
Subject(s) - hydrate , solubility , clathrate hydrate , dissociation (chemistry) , raman spectroscopy , aqueous solution , phase (matter) , pore water pressure , geology , phase boundary , mineralogy , deep sea , analytical chemistry (journal) , chemistry , thermodynamics , environmental chemistry , oceanography , physics , organic chemistry , optics , geotechnical engineering
The aqueous solubilities of CH 4 in the two‐phase (hydrate (H)‐liquid water (L W )) region, which is very close to the deep sea floor condition, were measured at various ranges of temperature and pressure. The hydration number determined via Raman spectroscopy at 10.0 MPa and 274.15 K was found to be 6.00 that is a little higher than 5.75 of the ideal one. The solubility of CH 4 in liquid water largely increased with a small increase of temperature, but slightly decreased with increasing pressure in the two‐phase (H‐L W ) region. This solubility behavior was experimentally confirmed to be completely different from that occurring in the three‐phase (H‐L W ‐V) boundary. The present results might be valuable as the fundamental data for estimating the amount of in situ gas hydrate and understanding the unique feature of hydrate formation/ dissociation mechanism and the hydrate stability in the deep ocean sediments.