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Natural Gas Storage Properties of Structure H Hydrate
Author(s) -
KHOKHAR A. A.,
SLOAN E. D.,
GUDMUNDSSON J. S.
Publication year - 2000
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1111/j.1749-6632.2000.tb06849.x
Subject(s) - clathrate hydrate , hydrate , methane , chemistry , natural gas , dissociation (chemistry) , volume (thermodynamics) , natural gas storage , thermodynamics , chemical engineering , mineralogy , organic chemistry , physics , engineering
A bstract : Methane gas storage properties of structure H (sH) hydrate were investigated in a Jerguson rocking cell reactor. It was assumed that the methane gas will occupy five small cages (three 5 12 and two 4 3 5 6 6 3 ) whereas the largest cage (one 5 12 6 8 ) will be occupied by a large (e.g., neohexane) molecule in a unit structure. A theoretical gas storage comparison with this methodology of storing methane in small cages showed that one unit volume of sH hydrate will store 201 volumes of methane gas. Three types of experiments were conducted to measure the methane gas storage in sH hydrate. It was discovered that sH hydrate promotion occurs with 0.1 weight percent solutions of lecithin and polyvinylpyrrolidone (PVP). These promoters also showed hydrates stabilization as hydrates melted at higher temperature compared to pure water hydrate. The heats of dissociation (Δ H diss ) below 0°C were estimated using Clausius‐Clapeyron equation and the experimentally measured equilibrium data for three hydrate structures (sI, sII, sH). Comparison of the estimated and calorimeter measured values (Δ H diss ) showed good agreement.