We have already reported the cage unoccupancy of hydrogen in the CO2 hydrate from the Raman spectroscopic analysis and the thermodynamic analysis using Soave Redlich Kwong equation of state. On the other hand, at the low temperatures, Kim and Lee (Journal of American Chemical Society, vol. 127, pp. 9996-9997, Jul. 2005) claimed that hydrogen is enclathrated in the CO2 hydrate. In the present st...

Gas hydrates were first discovered by Sir HumphryDavy in 1810 [1]. Clathratehydrates are crystalline compounds, formed by the smaller molecules (guest), entrapped within the cavities of a rigid “cage-like” lattice of water molecules (host) at low temperature (typically less than 300K) and high pressure (typically more than 0.6MPa) conditions [2]. The small molecules of gasses, such as methane (...

Hydrocarbons such as methane and ethane are present in many solar system objects, including comets, moons planets. The interaction of these hydrocarbons with water ice at low temperatures could lead to the formation inclusion compounds, clathrate hydrates (water based host cages trapping guest molecules), modifying their retention, stability therefore evolution. occurrence on surfaces be establ...

Natural gas hydrates (primarily methane hydrates) are considered to be an important and promising unconventional source of hydrocarbons. Most natural hydrate accumulations exist in pore space associated with reservoir rocks. Therefore, studies porous media particular interest, as well as, the phase equilibria hydrates, including determination equilibrium water content (nonclathrated water). Non...

ABSTARCT: As a result of geophysical researches in non-conventional energy sources in the earth in recent years, the discovery of large gas hydrate accumulations in terrestrial permafrost regions of the Arctic and beneath the sea along the outer continental margins of the world's oceans creates the interest of gas hydrates as a possible energy resource. Gas-hydrates are crystalline form in whic...

Abstract:  In this study, the change in the crystalline structure of gas hydrate was predicted for ternary mixture of methane-ethane-water. For this purpose, the tangent plane distance (TPD) minimization method was used. First, the calculations were performed for the binary mixtures of methane-water and ethane-water as the gas and liquid phases. The results show that for a binary mixture of th...

One of the important, practical and simple methods for hydrate formation conditionis empirical equations, and so far many empirical equations have been presented to predict thetemperature and pressure of hydrate formation. In this study, the methods and empiricalcorrelations have been reviewed and their predictive capabilities have been evaluated with ...