Experimental determination and modeling of structure II hydrates in mixtures of methane+water+1,4-dioxane

Thermodynamic promotion of carbon dioxide–clathrate hydrate formation by tetrahydrofuran, cyclopentane and their mixtures

“…Above this concentration, there is an excess of THF (with respect to formation of SII large cages) and the THF in the aqueous phase reduces the water chemical potential, increasing the hydrate formation pressure. A similar effect was observed by Jager et al (1999) for 1,4-dioxane.…”

Large pressure depression of methane hydrate by adding 1,1-dimethylcyclohexane

“…tetrahydrofuran (de Deugd et al, 2001;Seo et al, 2001), acetone (Ng and Robinson, 1996;Mainusch et al, 1997;de Deugd et al, 2001;Seo et al, 2001), and 1,4-dioxane (Jager et al, 1999;Seo et al, 2001), generate the structure-II hydrate crystal in the presence of methane and reduce the equilibrium pressure. These additives are, however, unsuitable for our practical object because they are perfectly soluble in water.…”

Enthalpies of dissociation of clathrate hydrates of carbon dioxide, nitrogen, (carbon dioxide+ nitrogen), and (carbon dioxide + nitrogen+ tetrahydrofuran)

“…However, the phase equilibria of mixed hydrates containing a hydrate promoter should take into account the large shift of pressure and temperature due to the addition of a small amount of promoter. Jager et al (11) suggested a thermodynamic model for predicting equilibrium conditions of methane hydrate with 1,4-dioxane as promoter. They assumed that the mixed hydrate of methane and 1,4-dioxane formed structure II, which would be general for other mixed hydrates having different promoters.…”