Abstract
Abstract: 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 512 and two 435663) whereas the largest cage (one 51268) 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 (ΔHdiss) 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 (ΔHdiss) showed good agreement.
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