Physical and Chemical Properties of Gas Hydrates: Theoretical Aspects of Energy Storage Application

Abstract

A model has been developed permitting to accurately predict on molecular level phase diagram of the clathrate hydrates. This model allows to take into account the influence of guest molecules on the host lattice and to extend the interval of temperatures and pressures of computed thermodynamic potentials and significantly improves known van der Waals and Platteeu theory. The theoretical study of phase equilibrium in gas-gas hydrate-ice Ih system for methane and xenon hydrates has been performed. The obtained results are in a good agreement with experimental data. A new interpretation of so-called self-preservation effect has been proposed. The self-preservation of gas hydrates can be connected with differences in thermal expansions of ice Ih and gas hydrates. This is confirmed by calculations performed for methane and mixed methane-ethane hydrates.

Monte Carlo Calculations of the Free Energy of Binary SII Hydrogen Clathrate Hydrates for Identifying Efficient Promoter Molecules

“…14 at fixed temperature and pressure, we get the expression for the water chemical potential relative to that of the empty hydrate (15) where N p , and N h denote isobaric semigrand ensemble averages.…”

Influence of the carbon chain length of a sulfate-based surfactant on the formation of CO2, CH4 and CO2–CH4 gas hydrates

“…Their high latent heat of fusion combined with their capacity both to encapsulate large amounts of gas and to selectively remove certain components from gas mixtures render gas hydrates potentially useful in various industrial processes. Applications include refrigeration (Clain et al, 2012), energy storage (Belosludov et al, 2007), energy transportation (Gudmundsson et al, 1999), capture of greenhouse gases (Adeyemo et al, 2010), and gas separation (Ricaurte et al, 2014a). Achieving formation of a large amount of hydrate at a high enough rate is generally one of the key challenges for ensuring the economic viability of gas hydrate-based processes.…”

Experimental study on the effect of pore size on carbon dioxide hydrate formation and storage in porous media

“…Gas hydrate usually forms at relatively high pressure and low temperature, which can accommodate different size gas molecules (Sloan and Koh, 2008). Several properties of gas hydrate have attracted more attention of scientists for their huge potential in such practical applications as refrigeration and air conditioning (Delahaye et al, 2011;Darbouret et al, 2005), energy storage or transportation (Gudmundsson et al, 1998;Belosludov et al, 2007), or capture and sequestration of greenhouse gases (Adeyemo et al, 2010;Seo et al, 2005). CO 2 hydrate, for itself, is composed of CO 2 and water molecules at certain pressure and temperature.…”